Patent Publication Number: US-11648127-B2

Title: Method and system including sleeves and broaches for surgically preparing the patient&#39;s bone

Description:
This application claims priority to U.S. patent application Ser. No. 15/662,781, now U.S. Pat. No. 10,583,011, filed Jul. 28, 2017, which claims priority to U.S. patent application Ser. No. 15/139,143, now U.S. Pat. No. 10,543,097, filed Apr. 26, 2016, which claims priority to U.S. patent application Ser. No. 13/832,490, now U.S. Pat. No. 9,320,603, filed Mar. 15, 2013, which claimed priority under 35 U.S.C. § 119 to U.S. Prov. App. No. 61/703,404, filed Sep. 20, 2012, entitled “Modular Knee Prosthesis System with Multiple Lengths of Sleeves Sharing Common Geometry,” the entirety of each of which is incorporated herein by reference in its entirety. 
     CROSS-REFERENCE 
     Cross reference is made to U.S. patent application Ser. No. 13/832,439 entitled “MODULAR KNEE PROSTHESIS SYSTEM WITH MULTIPLE LENGTHS OF SLEEVES SHARING A COMMON GEOMETRY,”, and U.S. patent application Ser. No. 13/832,415, now U.S. Pat. No. 9,532,879, entitled “FEMORAL KNEE PROSTHESIS SYSTEM WITH AUGMENTS AND MULTIPLE LENGTHS OF SLEEVES SHARING A COMMON GEOMETRY,” each of which is assigned to the same assignee as the present application, and each of which is hereby incorporated by reference. 
    
    
     TECHNICAL FIELD 
     The present disclosure relates generally to orthopaedic instruments for use in the performance of an orthopaedic joint replacement procedure, and more particularly to orthopaedic surgical instruments for use in the performance of a revision knee replacement procedure. 
     BACKGROUND 
     The knee joint basically consists of the bone interface of the distal end of the femur and the proximal end of the tibia. Appearing to cover or at least partially protect this interface is the patella, which is a sesamoid bone within the tendon of the long muscle (quadriceps) on the front of the thigh. This tendon inserts into the tibial tuberosity and the posterior surface of the patella is smooth and glides over the femur. 
     The femur is configured with two knob like processes (the medial condyle and the lateral condyle) which are substantially smooth and which articulate with the medial plateau and the lateral plateau of the tibia, respectively. The plateaus of the tibia are substantially smooth and slightly cupped thereby providing a slight receptacle for receipt of the femoral condyles. 
     When the knee joint is damaged whether as a result of an accident or illness, a prosthetic replacement of the damaged joint may be necessary to relieve pain and to restore normal use to the joint. Typically the entire knee joint is replaced by means of a surgical procedure that involves removal of the surfaces of the corresponding damaged bones and replacement of these surfaces with prosthetic implants. This replacement of a native joint with a prosthetic joint is referred to as a primary total-knee arthroplasty. 
     On occasion, the primary knee prostheses fails. Failure can result from many causes, including wear, aseptic loosening, osteolysis, ligamentous instability, arthrofibrosis and patellofemoral complications. When the failure is debilitating, revision knee surgery may be necessary. In a revision, the primary knee prosthesis is removed and replaced with components of a revision prosthetic knee system. 
     Knee implant systems for both primary and revision applications are available from a variety of manufacturers, including DePuy Orthopaedics, Inc. of Warsaw, Ind. DePuy and others offer several different systems for both primary and revision applications. For example, DePuy Orthopaedics offers the P.F.C. SIGMA® Knee System, the LCS® Total Knee System, and the S-ROM Modular Total Knee System. These orthopaedic knee systems includes several components, some appropriate for use in primary knee arthroplasty and some appropriate for use in revision surgery. 
     DePuy Orthopaedics also offers other orthopaedic implant systems for other applications. One such system is the LPS System. The LPS System is provided for use in cases of severe trauma and disease. In such cases, the trauma or disease can lead to significant amounts of bone loss. The LPS System provides components that can replace all or significant portions of a particular bone, such as the femur. The DePuy LPS System is described more fully in U.S. patent application Ser. No. 10/135,791, entitled “Modular Limb Preservation System”, filed Apr. 30, 2002 by Hazebrouck et al. (U.S. Pat. Pub. No. 2003-0204267), which is incorporated by reference herein in its entirety. 
     In some patients, the metaphysis of the bone near the joint presents cavitary defects that are not completely filled by standard knee implants. The presence of such metaphyseal defects can result in loosening of the prosthetic implant over time, compromising the stability of the prosthetic implant and frequently requiring revision of the prosthetic implant. 
     To fill metaphyseal cavitary defects, knee systems with modular metaphyseal sleeves have been provided. Such sleeves are illustrated, for example, in: U.S. Pat. Pub. No. 2010/0114323, entitled “Knee Prosthesis Kit with Winged Sleeves and Milling Guide;” U.S. Pat. Pub. No. 2006/0030945A1, entitled “Modular Orthopaedic Implant System With Multi-Use Stems;” U.S. Pat. No. 7,799,085, entitled “Modular Implant System With Fully Porous Coated Sleeve;” U.S. Pat. No. 7,291,174, entitled “Prosthetic Tibial Component With Modular Sleeve;” U.S. Pat. No. 6,171,342, entitled “Medical Fastening System;” U.S. Pat. No. 5,824,097, entitled “Medical Fastening System;” U.S. Pat. No. 5,782,921, entitled “Modular Knee Prosthesis;” and U.S. Pat. No. 4,634,444, entitled “Semi-Constrained Artificial Joint.” Such sleeves have been used in commercially available prosthetic knee implant systems, such as the P.F.C. SIGMA.® Knee System, the LCS® Total Knee System, the S-ROM Modular Total Knee System and the LPS System, all available from DePuy Orthopaedics, Inc. of Warsaw, Ind. 
     Modular sleeves have also been used in hip implant systems, as illustrated, for example, in: U.S. Pat. No. 6,264,699, entitled “Modular Stem and Sleeve Prosthesis;” and U.S. Pat. No. 4,790,852, entitled “Sleeves for Affixing Artificial Joints to Bone.” Such hip sleeves have been used in commercially available prosthetic hip implant systems, such as the S-ROM hip systems, available from DePuy Orthopaedics, Inc. of Warsaw, Ind. 
     The disclosures of all of the above patent applications and patents are incorporated by reference herein in their entireties. 
     In knee systems with modular metaphyseal sleeves, the conventional shape of many of the sleeves is generally an elliptical cone with a large ellipse profile close to the joint line tapering down to a smaller elliptical or circular profile at the termination of the component distal to the joint line. Generally, the sleeves have a terraced or stepped outer surface and an inner channel for frictional fixation to another component. This geometry fills cavitary defects in the metaphysis, allows for a wider surface area for load transfer through the joint and provides rotational stability for the articulating components of the prosthesis. 
     The outer surface of the sleeve is supported by solid bony structure or the bone bed. In the case of the distal femur, patient anatomy and the condition of the bone, particularly in a revision surgery, may require that the distal femur be resected to a more proximal level. Implanting a prosthetic distal femoral component and sleeve at this more proximal level may elevate the joint line (that is, the line defined by the articulation of the articular surfaces of the distal femoral component and proximal tibial component). Elevation of the joint line may adversely affect performance of the prosthetic knee system: the positions of the collateral ligament attachments to the femur relative to the joint line may impact knee kinematics, the articulation of the patella against the femoral component will be impacted, and the function of the extensor mechanism will also be impacted. 
     Prosthetic knee implant systems have commonly included femoral augments for use on the distal and posterior bone-facing surfaces of the femoral implant components. Examples of such augments are disclosed in U.S. Pat. Nos. 6,005,018 and 5,984,969, which are incorporated by reference herein in their entireties. Such components serve to augment the inferior and posterior portions of the femoral component to add additional thickness to compensate for the lack of sufficient boney tissue, allowing the joint line to be distalized. However, with the femoral component so distalized, the metaphyseal sleeve used with the femoral component may no longer be optimally seated on a healthy bone bed. To compensate, surgeons may sometimes opt to use a larger size of metaphyseal sleeve. Because of differences in the geometries of differently-sized metaphyseal sleeves, changing to a larger size requires that the surgeon prepare the bone cavity a second time so that the cavity will accept the geometry of the larger size of metaphyseal sleeve. 
     Accordingly, a need exists for a knee prosthesis system that allows the surgeon the flexibility to optimize the position of the joint line while also allowing for a metaphyseal sleeve to be efficiently and optimally positioned on a healthy bone bed. 
     SUMMARY 
     A modular knee implant system that allows the surgeon to prepare the bone to receive a metaphyseal sleeve and to optimize the position of the joint line without further bone preparation to receive a different size of metaphyseal sleeve is provided. 
     According to one aspect of the present disclosure, a modular knee prosthesis system is provided. The system includes a distal femoral implant component, a proximal tibial implant component and two metaphyseal members. The distal femoral implant component has a pair of spaced, curved distal condylar surfaces and a stem. The stem has an outer surface tapering from a distal end in the proximal direction. The outer surface of the stem has a maximum outer diameter at the distal end and a smaller outer diameter at a second position proximal to the distal end. The proximal tibial implant component has an articulating surface to receive and articulate with the distal articulating surfaces of the distal femoral component and a stem. The tibial stem has an outer surface tapering from a proximal end in the distal direction. The outer surface of the tibial stem has a maximum outer diameter at the proximal end and a smaller outer diameter at a second position distal to the proximal end. The first metaphyseal member has an outer surface that tapers in a proximal direction and an inner surface defining a tapered bore sized and shaped to be mountable on the stem of one of the implant components and to create a frictional lock between the stem and the first metaphyseal member. The outer surface of the first metaphyseal member comprises a stepped portion having a plurality of steps. Each step has a maximum medial-lateral dimension and a maximum anterior-posterior dimension. The stepped portion of the first metaphyseal sleeve has an overall axial length L. The second metaphyseal member has an outer surface that tapers in a proximal direction and an inner surface defining a tapered bore sized and shaped to be mountable on the stem of one of the implant components and to create a frictional lock between the stem component and the second metaphyseal member. The outer surface of the second metaphyseal member comprises a stepped portion having a plurality of steps. Each step has a maximum medial-lateral dimension and a maximum anterior-posterior dimension. The stepped portion of the second metaphyseal sleeve has an overall axial length L+X and has a common geometry with the first metaphyseal sleeve over axial length L: over axial length L, the maximum medial-lateral dimension and maximum anterior-posterior dimension of each step is the same as the maximum medial-lateral dimension and maximum anterior-posterior dimension of each step over the axial length L of the stepped portion of the first metaphyseal member. With this common geometry over axial length L, the same prepared bone space will receive either the first metaphyseal member or the second metaphyseal member. 
     In an illustrative embodiment, the first metaphyseal member and the second metaphyseal member have the same number of steps over axial length L of the stepped portions of the first metaphyseal member and the second metaphyseal member. 
     In a more particular embodiment, each step of the stepped portion of the first metaphyseal member has an axial height, each step of the stepped portion of the second metaphyseal member has an axial height, and the axial heights of corresponding steps of the first metaphyseal member and the second metaphyseal member are the same. 
     In another illustrative embodiment, the system also includes a third metaphyseal member having an outer surface that tapers in a proximal direction and an inner surface defining a tapered bore sized and shaped to be mountable on the stem of one of the implants components and to create a frictional lock between the stem and the third metaphyseal member. The outer surface of the third metaphyseal member comprises a stepped portion having a plurality of steps. Each step has a maximum medial-lateral dimension and a maximum anterior-posterior dimension. The stepped portion having an overall axial length L+X+Y. The maximum medial-lateral dimension and maximum anterior-posterior dimension of each step over the axial length L of the stepped portion of the third metaphyseal member is the same as the maximum medial-lateral dimension and maximum anterior-posterior dimension of each step over the axial length L of the stepped portion of the first metaphyseal member and the second metaphyseal member. The maximum medial-lateral dimension and maximum anterior-posterior dimension of each step over the axial length L+X of the stepped portion of the third metaphyseal member is the same as the maximum medial-lateral dimension and maximum anterior-posterior dimension of each step over the axial length L+X of the stepped portion of the second metaphyseal member. 
     In another illustrative embodiment, the tapered bore of the first metaphyseal member is sized and shaped to be mountable on the stem of the distal femoral implant component and to create a frictional lock between the stem of the distal femoral implant component and the first metaphyseal member and the tapered bore of the second metaphyseal member is sized and shaped to be mountable on the stem of the distal femoral implant component and to create a frictional lock between the stem of the distal femoral implant component and the first metaphyseal member. In this embodiment, the contact between the articulating surfaces of the tibial member and the distal femoral component define a first joint line when the distal femoral component is assembled with the first metaphyseal member and the contact between the articulating surfaces of the tibial member and the distal femoral component define a second joint line when the distal femoral component is assembled with the second metaphyseal member. The second joint line is more distal than the first joint line in this embodiment. 
     In a more particular embodiment, the distance between the first joint line and the second joint line corresponds with the difference between the overall axial lengths of the first metaphyseal member and the second metaphyseal member and defines a distal offset. 
     According to another aspect of the present invention, a modular knee prosthesis system comprises a distal femoral component, a first metaphyseal member and a second metaphyseal member. The distal femoral component has a pair of spaced, curved distal condylar surfaces and a stem having an outer surface tapering from a distal end in the proximal direction. The outer surface of the femoral stem has a maximum outer diameter at the distal end and a smaller outer diameter at a second position proximal to the distal end. The first metaphyseal member includes an inner surface defining a tapered bore sized and shaped to be mountable on the stem of the distal femoral component and to create a frictional lock between the stem of the distal femoral component and the first metaphyseal member. The tapered bore extends proximally from an opening at the distal end of the first metaphyseal member. The first metaphyseal member also includes a tapered stepped outer surface having an axial length L. The second metaphyseal member includes an inner surface defining a tapered bore sized and shaped to be mountable on the stem of the distal femoral component and to create a frictional lock between the stem of the distal femoral component and the second metaphyseal member, the tapered bore extending proximally from an opening at the distal end of the second metaphyseal member. The second metaphyseal member includes a tapered stepped outer surface having an axial length L+X. The tapered stepped outer surface of the first metaphyseal member and the tapered stepped outer surface of the second metaphyseal member have the same shape and the same medial-lateral dimensions and the same anterior-posterior dimensions over axial length L. When the first metaphyseal member is mounted on the distal femoral component with the first metaphyseal member frictionally locked to the distal femoral component, the assembly has a maximum axial length. When the second metaphyseal member is mounted on the distal femoral component with the second metaphyseal member frictionally locked to the distal femoral component, the assembly has a maximum axial length. The maximum axial length of the assembly of the second metaphyseal member and the distal femoral component is greater than the maximum axial length of the assembly of the first metaphyseal member and the distal femoral component. 
     In an illustrative embodiment, the first metaphyseal member and the second metaphyseal member have the same number of steps over axial length L of the tapered stepped outer surface of the first metaphyseal member and the tapered stepped outer surface of the second metaphyseal member. 
     In a more particular embodiment, each step of the tapered stepped outer surface of the first metaphyseal member has an axial height and each step of the tapered stepped outer surface of the second metaphyseal member has an axial height. The axial heights of corresponding steps of the first metaphyseal member and the second metaphyseal member are the same. 
     In another illustrative embodiment, the system further comprises a third metaphyseal member including an inner surface defining a tapered bore sized and shaped to be mountable on the stem of the distal femoral component and to create a frictional lock between the stem of the distal femoral component and the first metaphyseal member. The tapered bore extends proximally from an opening at the distal end of the first metaphyseal member. The first metaphyseal member includes a tapered stepped outer surface having an axial length L+X+Y. When the third metaphyseal member is mounted on the distal femoral component with the third metaphyseal member frictionally locked to the distal femoral component, the assembly has a maximum axial length. The maximum axial length of the assembly of the third metaphyseal member and the distal femoral component is greater than the maximum axial length of the assembly of the second metaphyseal member and the distal femoral component. 
     In another illustrative embodiment, the distal femoral component has a distal bone-facing surface and the system further comprises a distal femoral augment. The distal femoral augment has a thickness that is substantially the same as X. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The detailed description particularly refers to the following figures, in which: 
         FIG.  1    is a view of the femoral components of a modular knee prosthesis system; 
         FIG.  2    is a view of the tibial components of a modular knee prosthesis system; 
         FIG.  3    is a medial-lateral view of the smallest size of metaphyseal sleeves of the modular knee prosthesis system of  FIG.  1   ; 
         FIG.  4    is a medial-lateral view of another size of metaphyseal sleeves of the modular knee prosthesis system of  FIG.  1   ; 
         FIG.  5    is a medial-lateral view of another size of metaphyseal sleeves of the modular knee prosthesis system of  FIG.  1   ; 
         FIG.  6    is a medial-lateral view of the largest size of metaphyseal sleeves of the modular knee prosthesis system of  FIG.  1   ; 
         FIG.  7    is an anterior-posterior view of the metaphyseal sleeve of  FIG.  3   ; 
         FIG.  8    is an anterior-posterior view of the metaphyseal sleeve of  FIG.  4   ; 
         FIG.  9    is an anterior-posterior view of the metaphyseal sleeve of  FIG.  5   ; 
         FIG.  10    is an anterior-posterior view of the metaphyseal sleeve of  FIG.  6   ; 
         FIG.  11    is a cross-sectional view of the metaphyseal sleeve of  FIG.  7   , taken along line  11 - 11  of  FIG.  7   ; 
         FIG.  12    is a cross-sectional view of the metaphyseal sleeve  FIG.  10   , taken along line  12 - 12  of  FIG.  10   ; 
         FIG.  13    is an anterior-posterior view of a modular knee prosthesis system using a standard femoral stem and the smallest size of metaphyseal sleeve; 
         FIG.  14    is an anterior-posterior view of a modular knee prosthesis system similar to  FIG.  13    but shown with the largest size of metaphyseal sleeve; 
         FIG.  15    is a view of another embodiment of a modular prosthesis system; 
         FIG.  16    is a medial-lateral view of one size of metaphyseal sleeves of the modular knee prosthesis system of  FIG.  15   ; 
         FIG.  17    is a medial-lateral view of another size of metaphyseal sleeves of the modular knee prosthesis system of  FIG.  15   ; 
         FIG.  18    is a medial-lateral view of another size of metaphyseal sleeves of the modular knee prosthesis system of  FIG.  15   ; 
         FIG.  19    is a cross sectional plan view taken along the lines  19 - 19  in  FIGS.  16 - 18   ; 
         FIG.  20    is a cross sectional plan view taken along the lines  20 - 20  in  FIGS.  17 - 18   ; 
         FIG.  21    is a medial-lateral view of a surgical broach of an orthopaedic surgical instrument system for use with the modular knee prosthesis system of  FIG.  15   ; 
         FIG.  22    is a medial-lateral of another size of surgical broach of the orthopaedic surgical instrument system; 
         FIG.  23    is a medial-lateral of another size of surgical broach of the orthopaedic surgical instrument system; 
         FIG.  24    is a cross sectional plan view taken along the lines  24 - 24  in  FIGS.  21 - 23   ; 
         FIG.  25    is a cross sectional plan view taken along the lines  25 - 25  in  FIGS.  22 - 23   ; 
         FIG.  26    is a perspective view of a distal augment for use with a femoral component of the modular knee prosthesis system of  FIG.  15   ; 
         FIG.  27    is a fragmentary cross sectional view of the distal augment taken along the lines  27 - 27  in  FIG.  26   ; 
         FIG.  28    is a perspective view of another size of distal augment for use with the femoral component of  FIG.  15   ; 
         FIG.  29    is a fragmentary cross sectional view of the distal augment taken along the lines  29 - 29  in  FIG.  28   ; 
         FIG.  30    is an elevation view of the femoral component of  FIG.  15    and a posterior augment; 
         FIG.  31    is a view similar to  FIG.  30    showing the posterior augment secured to the femoral component and the distal augment of  FIGS.  26 - 27   ; 
         FIG.  32    is an elevation view of the femoral component of  FIG.  15    and another size of posterior augment; 
         FIG.  33    is a view similar to  FIG.  32    showing the posterior augment secured to the femoral component and the distal augment of  FIGS.  28 - 29   ; 
         FIG.  34    is a view similar to  FIGS.  32 - 33    showing the installation of the distal augment of  FIGS.  28 - 29   ; 
         FIG.  35    is a view similar to  FIGS.  32 - 34    showing the posterior augment and the distal augment secured to the femoral component; 
         FIG.  36    is an anterior-posterior view of a modular knee prosthesis system of  FIG.  15    using the metaphyseal sleeve of  FIG.  16    and the augments of  FIGS.  30 - 31   ; and 
         FIG.  37    is an anterior-posterior view similar to  FIG.  36    showing the metaphyseal sleeve of  FIG.  18    and the augments of  FIGS.  32 - 35   . 
     
    
    
     DETAILED DESCRIPTION OF THE DRAWINGS 
     While the concepts of the present disclosure are susceptible to various modifications and alternative forms, specific exemplary embodiments thereof have been shown by way of example in the drawings and will herein be described in detail. It should be understood, however, that there is no intent to limit the concepts of the present disclosure to the particular forms disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims. 
     Terms representing anatomical references, such as anterior, posterior, medial, lateral, superior, inferior, etcetera, may be used throughout the specification in reference to the orthopaedic implants and orthopaedic surgical instruments described herein as well as in reference to the patient&#39;s natural anatomy. Such terms have well-understood meanings in both the study of anatomy and the field of orthopaedics. Use of such anatomical reference terms in the written description and claims is intended to be consistent with their well-understood meanings unless noted otherwise. 
       FIG.  1    illustrates an example of the femoral components of a modular knee prosthesis system illustrating the principles of the present invention. The femoral components of the system include a distal femoral component  10  with distal curved convex condylar surfaces  12 ,  14 . The illustrated distal femoral component is a posterior stabilized component. The system illustrated in  FIG.  1    also includes a femoral stem  16 , along with a collar  18  for placement between the stem  16  and the distal femoral component  10  and a bolt  20  so that the stem  16  and collar  18  may be selectively mounted on the distal femoral component. Each stem  16  has a frusto-conical outer surface that is smooth and tapers from a maximum outer diameter at the distal end to smaller outer diameters at positions proximal to the distal end. Stem extensions  22  are also provided. All of the above components may be standard parts of the P.F.C. SIGMA.® Knee System available from DePuy Orthopaedics, Inc. of Warsaw, Ind., for example. Each stem  16  in the illustrated embodiments is an adapter with features like those illustrated in U.S. Pat. Pub. No. 2006/0030945, entitled “Modular Orthopaedic Implant System with Multi-Use Stems.” The stems  16  may also have features like those illustrated in U.S. Pat. No. 6,171,342, entitled “Medical Fastening System,” U.S. Pat. No. 5,824,097, entitled “Medical Fastening System,” U.S. Pat. No. 5,782,921, entitled “Modular Knee Prosthesis.” Also as described in U.S. Pat. Pub. No. 2006/0030945, the stem extension may have features other than those illustrated in  FIG.  1   . It should be understood that these components are described for purposes of illustration only; the present invention is not limited to any particular type of distal femoral component or stem or any other particular component unless expressly called out in the claims. For example, in some embodiments, the femoral component  10  may have an integral stem  16  instead of the illustrated stem adapter  16 , collar  18  and bolt  20 . 
     In the embodiment of  FIG.  1   , the femoral components of the illustrated system include a plurality of sizes of metaphyseal sleeves  24 ,  24 A,  24 B,  24 C. As described in more detail below, the geometries of the exterior surfaces of the four sizes of metaphyseal sleeves  24 ,  24 A,  24 B,  24 C are the same over a substantial portion of their axial lengths. It should be understood that multiple sizes of distal femoral components  10  and stem extensions  22  would typically be included in the modular knee prosthesis system. It should also be understood that a modular knee prosthesis system utilizing the principles of the present invention may include fewer or more sizes of metaphyseal sleeves  24 ,  24 A,  24 B,  24 C. 
     As illustrated in  FIG.  2   , on the tibial side, the kit includes a tibial tray component  30 , a tibial bearing insert  32  and a stem extension  34 . The illustrated tibial tray component  30  is a commercial MBT Revision tibial tray, available from DePuy Orthopaedics, Inc. of Warsaw, Ind. The tray component  30  has an integral stem portion  36  with a bore (not shown) with internal threads to which the stem extension  34  may be attached. The outer surface of the stem portion  36  has a smooth finish, tapers away from the joint motion surface and is connected to the inferior surface of the tibial tray component  30  through keels  31 ,  33 . The stem portion  36  extends distally from a platform  38 , which has a proximal surface on which the tibial bearing insert  32  rests. The tibial components may also include one or more types or sizes of metaphyseal sleeves, such as sleeve  40  that has a tapered bore (not shown) sized and shaped to frictionally lock with the tapered stem portion  36  of the tibial tray component  30 . It should be understood that these tibial components are described for purposes of illustration only; the present invention is not limited to any particular type of tibial component or stem or any other particular component unless expressly called out in the claims. For example, the tibial component may comprise a unitary, all-polymer component or a fixed bearing system, such as those disclosed in U.S. Pat. Nos. 7,628,818 and 8,128,703 (which are incorporated by reference herein in their entireties). 
     The juncture of the curved convex condyles  12 ,  14  of the distal femoral component  10  and the curved concave condylar surfaces of the tibial bearing insert  32  (the curved concave condylar surfaces of the tibial bearing insert being shown in  FIG.  2    in phantom at  37 ,  39 ) define the articulation of the femoral and tibial components as the knee flexes and extends. When the patient&#39;s leg is in extension, the contact between the curved convex condyles  12 ,  14  and concave condylar surfaces  37 ,  39  corresponds with a distal joint line. As the knee is flexed from full extension, the distal femoral component  10  and tibial bearing insert  32  move with respect to each other so that the joint line at full flexion (when the posterior surfaces of the femoral condyles contact the bearing surface) may vary somewhat from the distal joint line. The plane of the joint line, tangent to the point of contact of the condylar surfaces of the distal femoral component on the tibial insert, is shown at  21  in  FIGS.  1  and  13    and at  21 A in  FIG.  14   . 
     It should be understood that a typical modular knee prosthesis system or kit would include multiple sizes of each of the illustrated tibial components  30 ,  32 ,  34 ,  40 . 
     The metaphyseal sleeves  24 ,  24 A,  24 B,  24 C are designed for use in a bone wherein the condition of the bone requires additional support or fixation in the metaphysis of the bone. Each of the femoral sleeves  24 ,  24 A,  24 B,  24 C has an outer surface that includes a distal base  47 ,  47 A,  47 B,  47 C and a stepped portion  49 ,  49 A,  49 B,  49 C extending proximally from the distal base to the proximal ends  26 ,  26 A,  26 B,  26 C. Each stepped portion  49 ,  49 A,  49 B,  49 C has a plurality of adjacent steps or terraces, shown in  FIGS.  3 - 10    at  50 A,  50 B,  50 C and  50 D for the femoral sleeves  24 ,  24 A,  24 B,  24 C and at  54  for the tibial sleeve  40  ( FIG.  2   ). For the femoral sleeves, the stepped outer surfaces taper proximally: the steps  50 ,  50 A,  50 B,  50 C at the distal ends  56 ,  56 A,  56 B,  56 C have the largest anterior-posterior and medial-lateral dimensions and the steps  50 ,  50 A,  50 B,  50 C at the proximal ends  26 ,  26 A,  26 B,  26 C have the smallest anterior-posterior and medial-lateral dimensions; the intermediate steps gradually become smaller from the distal ends  56 ,  56 A,  56 B,  56 C toward the proximal ends  26 ,  26 A,  26 B,  26 C. For the tibial sleeve  40 , the outer surface tapers distally: the most distal step has the smallest anterior-posterior and medial-lateral dimensions and the most proximal step has the largest anterior-posterior and medial-lateral dimensions; the intermediate steps gradually become smaller from the proximal end toward the distal end. 
     It should be understood that the number and size of the steps  50 ,  50 A,  50 B,  50 C, may vary from the number and size of steps in the illustrated embodiments. For example, the outer surfaces of the metaphyseal sleeves  24 ,  24 A,  24 B,  24 C, may have steps and be shaped like standard commercially available metaphyseal sleeves sold by DePuy Orthopaedics, Inc. of Warsaw, Ind., and may be configured like the sleeves disclosed in the prior art, such as, for example, U.S. Pat. No. 7,799,085. The outer surfaces of the sleeves  24 ,  24 A,  24 B,  24 C, may also be porous coated to promote bone ingrowth, as disclosed in the prior art; the porous coating may extend over substantially all or a portion of the stepped outer surfaces of the sleeves  24 ,  24 A,  24 B,  24 C. 
     As shown in  FIGS.  1 ,  3 - 6  and  11 - 12   , the illustrated femoral sleeves  24 ,  24 A,  24 B,  24 C have interior surfaces  64 ,  64 A,  64 B,  64 C defining a proximal bore  68 ,  68 A,  68 B,  68 C and a distal bore  72 ,  72 A,  72 B,  72 C. The proximal and distal bores  68 ,  68 A,  68 B,  68 C,  72 ,  72 A,  72 B,  72 C in each femoral sleeve may be connected and aligned along central longitudinal axes  76 ,  76 A,  76 B,  76 C of the bores. 
     The proximal bores  68 ,  68 A,  68 B,  68 C of the femoral sleeves  24 ,  24 A,  24 B,  24 C are sized and shaped to receive a distal end  80  of a stem extension  22 . Accordingly, for a stem extension having a Morse taper post at its distal end, the proximal bore would comprise a Morse taper bore sized and shaped to receive and frictionally lock with the Morse taper post. Alternatively, for a stem extension having a threaded distal end, the proximal bore may be threaded to receive and lock to the threaded distal end of the stem extension. An adapter to allow for use of different types of stem extensions may also be used, as disclosed in U.S. Pat. No. 7,799,085. 
     The distal bores  72 ,  72 A,  72 B,  72 C of the femoral metaphyseal sleeves  24 ,  24 A,  24 B,  24 C are frusto-conical Morse taper bores, tapering from the distal ends  56 ,  56 A,  56 B,  56 C of the sleeves  24 ,  24 A,  24 B,  24 C toward the proximal ends  26 ,  26 A,  26 B,  26 C of the sleeves  24 ,  24 A,  24 B,  24 C. These distal bores  72 ,  72 A,  72 B,  72 C are sized, shaped and finished to be mountable on the stem or adapter  16  of the distal femoral component  10  and to create a frictional lock between the stem of the distal femoral component and the metaphyseal sleeve, the stem or adapter  16  defining a Morse taper post. 
     As used herein, “Morse taper” refers to one type of locking tapers between mating components. Generally, Morse taper posts and bores have frusto-conical shapes, substantially the same taper angle and have complementary outer and inner diameters at some point along their length to allow for tight frictional engagement between the posts and the walls defining the bores. Standard taper angles and standard surface finishes for such locking tapers may be used in the present invention. It should be appreciated that other types of tapered components may be used. 
     In the illustrated knee prosthesis system, the distal bores  72 ,  72 A,  72 B,  72 C of each size of sleeve  24 ,  24 A,  24 B,  24 C has the same maximum inner diameter at the distal end  56 ,  56 A,  56 B,  56 C of the sleeve. This maximum inner diameter substantially corresponds with the maximum outer diameter of the tapered frusto-conical outer surface  75  of the stem or adapter  16  of the distal femoral component  10 . The distal bores  72 ,  72 A,  72 B,  72 C of all the sizes of sleeves  24 ,  24 A,  24 B,  24 C and the tapered frusto-conical outer surface  75  of the stem or adapter  16  taper in the proximal direction at substantially the same taper angle so that relative axial movement of the sleeve  24 ,  24 A,  24 B,  24 C and stem or adapter  16  locks the two together when the interior surface  64 ,  64 A,  64 B,  64 C of the sleeve  24  engages and frictionally locks with the tapered frusto-conical outer surface  75  of the stem or adapter  16 . 
     As shown in  FIGS.  3 ,  7  and  13   , the stepped outer surface  49  of the smallest size of femoral metaphyseal sleeve  24  has an overall axial length between the distal base  47  and the proximal end  26  shown at “L”. The stepped outer surface  49 A of the next larger size of femoral metaphyseal sleeve  24 A has an overall axial length between the base  47 A and the proximal end  26 A of “L+X”, the dimensions “L” and “X” being shown in  FIGS.  4  and  8   . The stepped outer surface  49 B of the next larger size of femoral metaphyseal sleeve  24 B has an overall axial length between the base  47 B and the proximal end  26 B of “L+X+Y”, the dimensions “L”, “X” and “Y” being shown in  FIGS.  5  and  9   . The stepped outer surface  49 C of the largest illustrated size of femoral metaphyseal sleeve  24 C has an overall axial length between the base  47 C and the proximal end  26 C of “L+X+Y+Z”, the dimensions “L”, “X”, “Y” and “Z” being shown in  FIGS.  6 ,  10  and  14   . The different sizes of femoral metaphyseal sleeves may be provided with differences of a few millimeters (for example, 4 millimeters) between each size, so that X=4 mm, Y=4 mm and Z=4 mm. It should be understood that these dimensions are provided as examples only; the inventions is not limited to any particular dimensions unless expressly called for in the claims. 
     In the illustrated modular knee prosthesis system, the geometries of the stepped outer surfaces  49 ,  49 A,  49 B,  49 C of all sizes of femoral metaphyseal sleeve  24 ,  24 A,  24 B,  24 C are essentially identical over axial length “L”. Thus, if “L” is 68 mm for the smallest sleeve, the sizes and shapes of the proximal 68 mm of the other sleeve sizes  24 A,  24 B,  24 C are essentially identical to the size and shape of the proximal 68 mm of the smallest sleeve  24 . In other words, over axial length “L” for all of the illustrated sizes of femoral metaphyseal sleeves  24 ,  24 A,  24 B,  24 C, the sleeves have the same number of steps, and each step has the same maximum medial-lateral dimension, the same maximum anterior-posterior dimension, the same axial height and the same shape. The different sizes of femoral metaphyseal sleeves differ only in the sizes of the bases  47 ,  47 A,  47 B,  47 C and in the distal portions corresponding with the axial extensions of the sleeves beyond the length “L” of the smallest sleeve  24 . 
     
       
         
           
               
               
               
               
               
             
               
                   
               
               
                   
                 Maximum A-P 
                 Maximum A-P 
                 Maximum M-L 
                 Maximum M-L 
               
               
                 Femoral 
                 Dimension at 
                 Dimension 
                 Dimension 
                 Dimension 
               
               
                 Sleeve 
                 “L” 
                 distal to “L” 
                 at “L” 
                 distal to “L” 
               
               
                   
               
             
            
               
                 24 
                 22 mm 
                 Not applicable 
                 34 mm 
                 Not applicable 
               
               
                 24A 
                 22 mm 
                 24 mm 
                 34 mm 
                 40 mm 
               
               
                 24B 
                 22 mm 
                 24 mm 
                 34 mm 
                 46 mm 
               
               
                 24C 
                 22 mm 
                 26 mm 
                 34 mm 
                 52 mm 
               
               
                   
               
            
           
         
       
     
       FIGS.  13  and  14    illustrate assemblies of the smallest and largest illustrated femoral metaphyseal sleeves  24 ,  24 C with a distal femoral implant component  10 , femoral stem extension  22 , tibial tray  30 , tibial insert  32  and tibial stem extension  34 . The illustrated assemblies have maximum axial lengths from planes at the proximal ends  26 ,  26 C (the planes shown at  100  and  102 ) to the plane of the joint line, shown at  21  in  FIG.  13    and at  21 A in  FIG.  14   . These maximum axial lengths of the assemblies are shown at AL 1  in  FIGS.  13    and AL 2  in  FIG.  14   . AL 2  is longer than AL 1  by the dimension “X+Y+Z”, that is the axial length of the sleeve  24 C beyond the length “L” of the smallest sleeve  24 . 
     As can also be seen from a comparison of  FIGS.  13  and  14   , using the larger sleeve  24 C distalizes the joint line  21  to the position  21 A by the offset distance o 1 . This offset distance o 1  also corresponds with the dimension “X+Y+Z”. Similarly, using the sleeve  24 A distalizes the joint line by the dimension “X” and using the sleeve  24 B distalizes the joint line by the dimension “X+Y”. 
     Since the geometries of the stepped outer surfaces  49 ,  49 A,  49 B,  49 C of the different sizes of sleeves  24 ,  24 A,  24 B,  24 C are the same through axial length “L”, the surgeon can prepare the distal femur to receive the smallest size of femoral sleeve  24 . If the surgeon determines intraoperatively that the joint line should be distalized, the surgeon may use any of the other sizes of sleeve  24 A,  24 B,  24 C, and the proximal portion of the larger size sleeve will fit within the opening prepared in the femur to receive the smaller sleeve and extend distally from the bone by the distance “X”, “X+Y” or “X+Y+Z” to thereby distally offset the joint line. The surgeon can accomplish this distalization without any further preparation of the bone cavity. 
     As described above, femoral augments may be used on the distal and posterior bone-facing surfaces of the femoral implant components when the joint line is distalized. In the illustrative embodiment, a distal augment  110  may be attached to one of a pair of distal fixation surfaces  109  of the distal femoral implant component  10  when the sleeve  24 C is used, as shown in  FIG.  14   . In the illustrative embodiment, the thickness of the augment  109  is equal to the offset distance o 1 . One of the distal fixation surfaces  109  is positioned opposite the condylar surface  12  and the other distal fixation surface  109  is positioned opposite the condylar surface  14 . It should be appreciated that another distal augment may be attached to that surface as well. When the sleeve  24  is used, no augment is necessary, as shown in  FIG.  13   . 
     It should also be appreciated that the principles of the present invention may also be applied to the tibial components of the knee implant system, such as the tibial sleeve  40  shown in  FIG.  2   . Such a system could allow the surgeon to select components to provide a proximal offset to the tibial tray platform  38 . 
     All of the components of the prosthesis systems described herein may be made of standard materials, such as a standard polymer (UHMWPE, for example) for the tibial bearing insert  32  and standard metals, such as cobalt-chromium and titanium alloys, for the remaining components. To promote bone ingrowth, the sleeves  24 ,  24 A,  24 B,  24 C may be porous coated, or could comprise titanium foam as disclosed in U.S. Pat. Pub. Nos. 20100057212 (“Porous Titanium Tibial Sleeves and Their Use in Revision Knee Surgery”) and 20100076565 (“Porous Titanium Femoral Sleeves and Their Use in Revision Knee Surgery”), both of which are incorporated by reference herein in their entireties. 
     Referring now to  FIGS.  15 - 37   , another modular knee prosthesis system is shown with different embodiments of the femoral components (hereinafter components  200 ). An orthopaedic surgical instrument system  300  for use with the modular knee prosthesis system is also shown. Some features of the embodiments illustrated in  FIGS.  15 - 37    are substantially similar to those discussed above in reference to the embodiment of  FIGS.  1 - 14   . Such features are designated in  FIGS.  15 - 37    with the same reference numbers as those used in  FIGS.  1 - 14   . 
     As shown in  FIG.  15   , the femoral components  200  of the system include a femoral component  210  including distal curved convex condylar surfaces  12 ,  14 . The surfaces  12 ,  14  are shaped (i.e., curved) in a manner that approximates the condyles of the natural femur. In the illustrative embodiment, the condylar surface  12  is a medial condyle surface  12 , and the condylar surface  14  is a lateral condyle surface  14 . The surfaces  12 ,  14  are spaced apart from one another, thereby defining an intercondylar notch therebetween. 
     The condyle surfaces  12 ,  14  are formed in a bearing surface  212  of the femoral component  210 , and the femoral component  210  includes a fixation surface  214  positioned opposite the bearing surface  212 . The femoral component  210  also includes an elongated stem post  216  that extends superiorly away from the surface  214 . The elongated stem post  216  is configured to receive a stem component such as, for example, the stem extension  22 , or engage a metaphyseal sleeve such as, for example, the sleeves  24 ,  24 A,  24 B,  24 C described above or sleeves  224 ,  224 A,  224 B, which are described in greater below. 
     Specifically, as shown in  FIG.  15   , the elongated stem post  216  of the femoral component  210  has a tapered bore  218  defined therein into which the tapered distal end  80  of the stem extension  22  may be advanced to taper lock the post  216  to the stem extension  22 . Similar to the adaptor  16  of the distal femoral component  10 , the outer surface  220  of the elongated stem post  216  is also tapered and may be advanced into one of the distal bores  72 ,  72 A,  72 B,  72 C of the sleeves  24 ,  24 A,  24 B,  24 C, respectively, or one of the tapered distal bores  272 ,  272 A,  272 B of the sleeves  224 ,  224 A,  224 B. As described above, each distal bore is shaped and finished to create a frictional lock such as, for example, a taper lock, between the corresponding sleeve and the femoral component  210 . In the illustrative embodiment, the outer surface  220  defines a Morse taper. 
     The fixation surface  214  of the femoral component  210  includes a number of surfaces  230 ,  232 ,  234 ,  236  positioned opposite the condyle surfaces  12 ,  14 . In the illustrative embodiment, the fixation surface  214  includes a pair of distal fixation surfaces  230  similar to the distal fixation surface  109  of distal femoral component  10 . One of the distal fixation surfaces  230  is positioned medially and the other is positioned laterally. The fixation surface  214  also includes a pair of posterior fixation surfaces  232 , with one being medially positioned and the other laterally positioned. As shown in  FIG.  15   , the posterior fixation surfaces  232  extend generally in the superior/inferior direction. 
     The fixation surface  214  also includes a pair of posterior chamfer surfaces  234 , with one being medially positioned and the other laterally positioned. The medial and lateral posterior-chamfer fixation surfaces  234  extend superiorly and posteriorly from their respective lateral and medial distal fixation surfaces  230  to their respective posterior fixation surfaces  232 . As shown in  FIG.  15   , the fixation surface  214  has a pair of anterior chamfer surfaces  236 , with one being medially positioned and the other laterally positioned. The medial and lateral anterior-chamfer fixation surfaces  236  extend superiorly and posteriorly from their respective lateral and medial distal fixation surfaces  230  to their respective posterior fixation surfaces  232 . 
     Each of the fixation surfaces  230 ,  232 ,  234 ,  236  has a cement pocket formed therein. In the illustrative embodiment, the cement pockets are contiguous with one another such that a single, continuous cement pocket  240  is formed in both the medial and lateral fixation surfaces  214  of the femoral component  210 . Each cement pocket  240  is defined by a side wall  242  that extends inwardly from the respective fixation surface  214  to a bottom wall  244 . 
     A mounting aperture  250  is defined in each distal fixation surface  230 . As shown in  FIG.  15   , the aperture  250  is defined by a cylindrical wall  252  that extends inwardly from a rim  254  positioned in the cement pocket  240 . As described in greater detail below, the aperture  250  is sized to receive a mounting plug  256  of a distal augment component  342 ,  344  to secure the augment component  342 ,  344  to the femoral component  210 . 
     Another mounting aperture  260  is defined in each posterior fixation surface  232 . As shown in  FIG.  15   , the aperture  260  is defined by a cylindrical wall  252  that extends inwardly from a rim  254  positioned in the cement pocket  240 . As described in greater detail below, the aperture  260  is sized to receive a mounting plug  256  of a posterior augment component  346 ,  348  to secure the augment component  346 ,  348  to the femoral component  210 . 
     As shown in  FIG.  15   , the femoral components  200  include a plurality of sizes of metaphyseal sleeves  224 ,  224 A,  224 B. Similar to the sleeves  24 ,  24 A,  24 B,  24 C described above, the geometries of the sleeves  224 ,  224 A,  224 B of the exterior surfaces of the three sizes are the same over a portion of their axial lengths. As used herein, the terms “same,” “match,” or “identical” refer to components that are designed to have the same dimensions and configuration. Such components may be subject to accepted tolerances or manufacturing variations that cause the components to vary slightly in some respect. For example, the portions of metaphyseal sleeves  224 ,  224 A,  224 B that are designed to be the same may nevertheless vary slightly due to manufacturing tolerances. Nevertheless, such components are the same, match, or are identical because they are designed to have the same configuration and dimensions. It should be understood that multiple sizes of femoral components  210  would typically be included in the modular knee prosthesis system. It should also be understood that a modular knee prosthesis system utilizing the principles of the present disclosure may include fewer or more sizes of metaphyseal sleeves  224 ,  224 A,  224 B. 
     Similar to the sleeves  24 ,  24 A,  24 B,  24 C, the sleeves  224 ,  224 A,  224 B are designed for use with bones in which the condition of the bone requires additional support or fixation in the metaphysis of the bone. As shown in  FIG.  15   , each of the sleeves  224 ,  224 A,  224 B has a distal base  262 ,  262 A,  262 B and a body  264 ,  264 A,  264 B extending proximally from its respective distal base to a respective proximal end  266 ,  266 A,  266 B. 
     As shown in  FIG.  15   , each of the sleeves  224 ,  224 A,  224 B has a proximal bore  268 ,  268 A,  268 B defined in the proximal end  266 ,  266 A,  266 B thereof. The proximal bores  268 ,  268 A,  268 B, of the femoral sleeves  224 ,  224 A,  224 B are sized and shaped to receive a distal end  80  of a stem extension  22 . Accordingly, for a stem extension having a tapered post at its distal end, the proximal bore would comprise a tapered bore sized and shaped to receive and frictionally lock with the tapered post. Alternatively, for a stem extension having a threaded distal end, the proximal bore may be threaded to receive and lock to the threaded distal end of the stem extension. As described above, each of the sleeves  224 ,  224 A,  224 B has a distal bore  272 ,  272 A,  272 B, which is defined in the respective distal base  262 ,  262 A,  262 B of each sleeve, as shown in  FIGS.  16 - 18   . 
     Referring now to  FIGS.  16 - 18   , the bodies  264 ,  264 A,  264 B of the sleeves  224 ,  224 A,  224 B include a plurality of stepped walls  274 ,  274 A,  274 B. Each pair of adjacent stepped walls  274 ,  274 A,  274 B is connected by an annular surface  276 ,  276 A,  276 B. As a result, the bodies  264 ,  264 A,  264 B are terraced similar to the sleeves  24 ,  24 A,  24 B,  24 C. In the illustrative embodiment, the bodies  264 ,  264 A,  264 B are tapered such that the sleeves  224 ,  224 A,  224 B have the smallest anterior-posterior dimensions and the smallest medial-lateral dimensions at their respective proximal ends  266 ,  266 A,  266 B and become progressively larger as the bodies  264 ,  264 A,  264 B extend to their respective distal bases  262 ,  262 A,  262 B. 
     It should be understood that the number and size of the stepped walls  274 ,  274 A,  274 B may vary from the number and size of steps in the illustrated embodiments. The outer surfaces of the sleeves  262 ,  262 A,  262 B may also be porous coated to promote bone ingrowth, as disclosed in the prior art; the porous coating may extend over substantially all or a portion of the stepped outer surfaces of the sleeves  224 ,  224 A,  224 B. It should be understood that these dimensions are provided as examples only; the disclosure is not limited to any particular dimensions unless expressly called for in the claims. 
     As shown in  FIG.  16   , the body  264  of the sleeve  224  has a longitudinal axis  280  and a tapered outer surface  282  that has an axial length “L” defined along the axis  280 . In the illustrative embodiments, the annular surfaces  276  are substantially flat. As a result, the stepped walls  274  combine to define the axial length L of the body  264 . In the illustrative embodiment, the axial length L is equal to approximately 45 millimeters. 
     As shown in  FIG.  17   , the body  264 A of the sleeve  224 A has a longitudinal axis  280 A and a tapered outer surface  282 A. The tapered outer surface  282 A has a proximal section  284 A that has an axial length “L” defined along the axis  280 A and a section  286 A extending distally from the proximal section  284 A to the distal base  262 A. The section  286 A has an axial length “X” defined along the axis  280 A. As a result, the overall axial length of the body  264 A is “L+X.” In the illustrative embodiment, the axial length “L+X” is equal to approximately 50 millimeters. 
     As shown in  FIG.  18   , the body  264 B of the sleeve  224 B has a longitudinal axis  280 B and a tapered outer surface  282 B. The tapered outer surface  282 B has a proximal section  284 B that has an axial length “L” defined along the axis  280 B and a section  286 B extending distally from the proximal section  284 A. The section  286 A has an axial length “X” defined along the axis  280 B. The tapered outer surface  282 B has another section  288 B that extends distally from the section  286 B to the distal base  262 B. The section  288 B has an axial length “Y” defined along the axis  280 B. As a result, the overall axial length of the body  264 A is “L+X+Y.” In the illustrative embodiment, the axial length “L+X+Y” is equal to approximately 55 millimeters. 
     In the illustrative embodiment, the different sizes of femoral metaphyseal sleeves may be provided with differences of a few millimeters (for example, 5 millimeters) between each size, so that X=5 mm, Y=5 mm and Z=5 mm. Additionally, the overall axial length of the different sleeves may vary. For example, in one embodiment, the overall axial lengths of the sleeves may be between 30 millimeters and 55 millimeters. 
     In the illustrated modular knee prosthesis system, the outer geometries of the tapered outer surfaces  282 ,  282 A,  282 B of all sizes of femoral metaphyseal sleeve  224 ,  224 A,  224 B are essentially identical over axial length “L.” Thus, if “L” of the sleeve  224  is 45 mm, the sizes and shapes of the proximal 45 mm of the other sleeve sizes  224 A,  224 B (i.e., the proximal sections  284 A,  284 B) are essentially identical to the size and shape of the proximal 45 mm of the sleeve  224 . In other words, over axial length “L” for all of the illustrated sizes of femoral metaphyseal sleeves  224 ,  224 A,  224 B, the sleeves have the same number of stepped walls, as shown in  FIGS.  16 - 18   . Further, as shown in  FIG.  19   , each stepped wall over axial length “L” also has the same maximum medial-lateral dimension  290 , the same maximum anterior-posterior dimension  292 , and the same shape. Each stepped wall over axial length “L” also has the same axial height, as shown in  FIGS.  16 - 18   . 
     The different sizes of femoral metaphyseal sleeves  224 ,  224 A,  224 B differ only in the sizes of the bases  262 ,  262 A,  262 B and in the distal portions corresponding with the axial extensions of the sleeves beyond a given axial length. For example, the tapered outer surfaces  282 A,  282 B of the femoral metaphyseal sleeve  224 A,  224 B are essentially identical over axial length “X.” Thus, if “X” of the sleeve  224 A is 5 mm, the size and shape of the section  286 B of the sleeve  224 B is essentially identical to the size and shape of the section  286 A of the sleeve  224 A. In other words, over axial length “X” for the illustrated sizes of femoral metaphyseal sleeves  224 A,  224 B, the sleeves have the same number of stepped walls, as shown in  FIGS.  17 - 18   . Further, as shown in  FIG.  20   , each stepped wall has the same maximum medial-lateral dimension  294 , the same maximum anterior-posterior dimension  296 , and the same shape. Nevertheless, the femoral metaphyseal sleeve  224 B differs from the sleeve  224 A in the size of the base  262 B and in the configuration of the distal section  288 B. 
     Referring now to  FIGS.  21 - 25   , a plurality of surgical instruments  300 , which may be used with the femoral components  200 , is shown. In the illustrative embodiment, the surgical instruments  300  are a plurality of sizes of surgical broaches  302 ,  302 A,  302 B. Each of the broaches  302 ,  302 A,  302 B is formed from a metallic material such as, for example, stainless steel or cobalt chromium. As described in greater detail below, the outer geometries of the broaches  302 ,  302 A,  302 B are the same over a portion of their axial lengths and correspond to the outer geometries of the metaphyseal sleeves  224 ,  224 A,  224 B. As described above, in other embodiments, the femoral components  200  may include fewer or more sizes of metaphyseal sleeves  224 ,  224 A,  224 B; it should be appreciated that in such embodiments the surgical instruments  300  may include fewer or more sizes of broaches  302 ,  302 A,  302 B. 
     Each of the broaches  302 ,  302 A,  302 B includes a proximal tip  304 ,  304 A,  304 B and a body  306 ,  306 A,  306 B extending from the proximal tip  304 ,  304 A,  304 B to a respective distal end  308 ,  308 A,  308 B. In the illustrative embodiment, the tip  304 ,  304 A,  304 B of each broach  302 ,  302 A,  302 B has an aperture  310 ,  310 A,  310 B defined therein that is sized to receive a femoral stem trial. The distal end  308 ,  308 A,  308 B of each broach  302 ,  302 A,  302 B is configured to engage an attachment mechanism of an instrument handle. An exemplary configuration of the distal end  308 ,  308 A,  308 B of each broach  302 ,  302 A,  302 B is shown and described in U.S. patent application Ser. No. 13/834,862 entitled “FEMORAL SYSTEM HANDLE SURGICAL INSTRUMENT AND METHOD OF ASSEMBLING SAME”, which was filed concurrently herewith and is expressly incorporated herein by reference. 
     The bodies  306 ,  306 A,  306 B have a plurality of cutting teeth  312 ,  312 A,  312 B defined in the outer surface  322 ,  322 A,  322 B thereof. The cutting teeth  312 ,  312 A,  312 B are configured to engage the bone surrounding the medullary canal of the patient&#39;s femur to define a cavity in the bone sized to receive a sleeve. The cutting teeth  312 ,  312 A,  312 B cooperate to define a plurality of stepped planes  314 ,  314 A,  314 B of their respective outer surfaces  322 ,  322 A,  322 B. As a result, the bodies  264 ,  264 A,  264 B are terraced. In the illustrative embodiment, the bodies  306 ,  306 A,  306 B are tapered such that the broaches  302 ,  302 A,  302 B have the smallest anterior-posterior dimensions and the smallest medial-lateral dimensions at their respective proximal tips  304 ,  304 A,  304 B and become progressively larger as the bodies  306 ,  306 A,  306 B extend to their respective distal ends  308 ,  308 A,  308 B. In the illustrative embodiment, the number of stepped planes  314 ,  314 A,  314 B of the broaches  302 ,  302 A,  302 B corresponds to the number of the stepped walls  274 ,  274 A,  274 B of the sleeves  224 ,  224 A,  224 B, respectively. 
     As shown in  FIG.  21   , the body  306  of the broach  302  has a longitudinal axis  320  and a tapered outer surface  322  defined by the tips  324  of the cutting teeth  312 . The tapered outer surface  322  has an axial length “L” defined along the axis  320 . In that way, the body  306  has the same axial height as the body  264  of the sleeve  224 . Additionally, the stepped planes  314  of the body  306  combine to define the axial length L of the body  306 . In the illustrative embodiment, the number of stepped planes  314  is equal to the number of stepped walls  274  of the sleeve  224 ; as such, each stepped plane  314  corresponds to a stepped wall  274  of the sleeve  224 . 
     The tapered outer surface  322  of the broach  302  has a proximal section  326  extending from the proximal tip  304  and a section  328  extending from the proximal section  326  to the distal end  308 . The distal section  328  has an axial length that is approximately 50% of the axial length L. 
     In the proximal section  326  of the tapered outer surface  322 , the outer geometry of the broach  302  defined by the stepped planes  314  is the same as the corresponding outer geometry of the sleeve  224  defined by the stepped walls  274 . In other words, the number of stepped planes  314  is equal to the number of stepped walls  274 , and each stepped plane  314  has the same maximum medial-lateral dimension, the same maximum anterior-posterior dimension, and the same axial height as the corresponding stepped wall  274 . For example, as shown in  FIG.  24   , the stepped planes  314  in the proximal section  326  define the same maximum medial-lateral dimension  290  and the same maximum anterior-posterior dimension  292  as the corresponding stepped wall  274  of the sleeve  224 . As a result, the broach  302  is configured to define a cavity in the patient&#39;s femur that includes a proximal section that is substantially the same as the sleeve  224  such that the sleeve  224  is fitted into that section. 
     In the distal section  328  of the tapered outer surface  322  the number of stepped planes  314  is equal to the number of stepped walls  274 , and each stepped plane  314  has the same axial height as the corresponding stepped wall  274 . However, the maximum medial-lateral dimension and the maximum anterior-posterior dimension of each stepped plane  314  are smaller than the maximum medial-lateral dimension and the maximum anterior-posterior dimension of the corresponding stepped wall  274 . In other words, the outer geometry of the broach  302  defined by the stepped planes  314  is smaller than the corresponding outer geometry of the sleeve  224  defined by the stepped walls  274 . As a result, the broach  302  is configured to define a cavity in the patient&#39;s femur that includes a distal section that is smaller than the sleeve  224  such that the sleeve  224  is press fit into that section. 
     In the illustrative embodiment, the maximum medial-lateral dimension of each stepped plane  314  in the distal section  328  is 0.35 mm less than the maximum medial-lateral dimension of the corresponding stepped wall  274  of the sleeve  224 . Similarly, the maximum anterior-posterior dimension of each stepped plane  314  in the distal section  328  is 0.35 mm less than the maximum anterior-posterior dimension of the corresponding stepped wall  274  of the sleeve  224 . It should be appreciated that in other embodiments the dimensions of the broach  302  may be adjusted to provide greater or less press fit for the sleeve  224 . 
     Furthermore, since the geometries of the outer surfaces  282 ,  282 A,  282 B of the femoral metaphyseal sleeves  224 ,  224 A,  224 B are essentially identical through axial length “L,” the sleeves  224 A,  224 B will fit within a cavity prepared by the broach  302  in a patient&#39;s femur and extend distally from the bone by the distance “X” or “X+Y.” As such, if the sleeve  224 A is inserted into a cavity prepared by the broach  302 , the portion of the sleeve  224  corresponding to the distal section  328  of the broach  302  will be press fit, while the portion corresponding to the proximal section  326  of the broach  302  will be fitted into that portion of the cavity. 
     As shown in  FIG.  22   , the body  306 A of the broach  302 A has a longitudinal axis  320 A and a tapered outer surface  322 A defined by the tips  324 A of the cutting teeth  312 A. The tapered outer surface  322 A has an axial length “L+X” defined along the axis  320 A. In that way, the body  306 A has the same axial height as the sleeve  224 A. Additionally, the stepped planes  314 A of the body  306 A combine to define the axial length “L+X” of the body  306 A. In the illustrative embodiment, the number of stepped planes  314 A is equal to the number of stepped walls  274 A of the sleeve  224 A; as such, each stepped plane  314 A corresponds to a stepped wall  274 A of the sleeve  224 A. 
     The tapered outer surface  322 A of the broach  302 A has a proximal section  326 A extending from the proximal tip  304 A and a section  328 A extending from the proximal section  326 A to the distal end  308 A. The distal section  328 A has an axial length that is approximately 50% of the axial length “L+X.” 
     In the proximal section  326 A of the tapered outer surface  322 A, the outer geometry of the broach  302 A defined by the stepped planes  314 A is the same as the corresponding outer geometry of the sleeve  224 A defined by the stepped walls  274 A. In other words, the number of stepped planes  314 A is equal to the number of stepped walls  274 A, and each stepped plane  314 A has the same maximum medial-lateral dimension, the same maximum anterior-posterior dimension, and the same axial height as the corresponding stepped wall  274 A. For example, as shown in  FIG.  24   , the stepped planes  314 A in the proximal section  326 A define the same maximum medial-lateral dimension  290  and the same maximum anterior-posterior dimension  292  as the corresponding stepped wall  274 A of the sleeve  224 A. As a result, the broach  302 A is configured to define a cavity in the patient&#39;s femur that includes a proximal section that is substantially the same as the sleeve  224 A such that the sleeve  224 A is fitted into that section. 
     In the distal section  328 A of the tapered outer surface  322 A the number of stepped planes  314 A is equal to the number of stepped walls  274 A, and each stepped plane  314 A has the same axial height as the corresponding stepped wall  274 A. However, the maximum medial-lateral dimension and the maximum anterior-posterior dimension of each stepped plane  314 A are smaller than the maximum medial-lateral dimension and the maximum anterior-posterior dimension of the corresponding stepped wall  274 A. In other words, the outer geometry of the broach  302 A defined by the stepped planes  314 A is smaller than the corresponding outer geometry of the sleeve  224 A defined by the stepped walls  274 A. 
     For example, as shown in  FIG.  25   , a stepped plane  314 A in the distal section  328 A defines a maximum medial-lateral dimension  330  that is less than the maximum medial-lateral dimension  294  of the corresponding stepped wall  274 A. Similarly, the same stepped plane  314 A in the distal section  328 A defines a maximum anterior-posterior dimension  332  that is less than the maximum anterior-posterior dimension  296  of the corresponding stepped wall  274 A. As a result, the broach  302 A is configured to define a cavity in the patient&#39;s femur that includes a distal section that is smaller than the sleeve  224 A such that the sleeve  224 A is press fit into that section. 
     In the illustrative embodiment, the maximum medial-lateral dimension of each stepped plane  314 A in the distal section  328 A is 0.35 mm less than the maximum medial-lateral dimension of the corresponding stepped wall  274 A of the sleeve  224 A. Similarly, the maximum anterior-posterior dimension of each stepped plane  314 A in the distal section  328 A is 0.35 mm less than the maximum anterior-posterior dimension of the corresponding stepped wall  274 A of the sleeve  224 A. It should be appreciated that in other embodiments the dimensions of the broach  302 A may be adjusted to provide greater or less press fit for the sleeve  224 A. It should also be appreciated that the medial-lateral press fit and the anterior-posterior press fit may or may not be equal. 
     Furthermore, since the geometries of the outer surfaces  282 A,  282 B of the femoral metaphyseal sleeves  224 A,  224 B are essentially identical through axial length “L+X,” the sleeve  224 B will fit within a cavity prepared by the broach  302 A in a patient&#39;s femur and extend distally from the bone by the distance “X+Y.” As such, if the sleeve  224 B is inserted into a cavity prepared by the broach  302 A, the portion of the sleeve  224 B corresponding to the distal section  328 A of the broach  302 A will be press fit, while the portion of the sleeve  224 B corresponding to the proximal section  326 A of the broach  302 A will be fitted into that portion of the cavity. 
     As shown in  FIG.  23   , the body  306 B of the broach  302 B has a longitudinal axis  320 B and a tapered outer surface  322 B defined by the tips  324 B of the cutting teeth  312 B. The tapered outer surface  322 B has an axial length “L+X+Y” defined along the axis  320 B. In that way, the body  306 B has the same axial height as the sleeve  224 B. Additionally, the stepped planes  314 B of the body  306 B combine to define the axial length “L+X+Y” of the body  306 B. In the illustrative embodiment, the number of stepped planes  314 B is equal to the number of stepped walls  274 B of the sleeve  224 B; as such, each stepped plane  314 B corresponds to a stepped wall  274 B of the sleeve  224 B. 
     The tapered outer surface  322 B of the broach  302 B has a proximal section  326 B extending from the proximal tip  304 B and a section  328 B extending from the proximal section  326 B to the distal end  308 B. The distal section  328 B has an axial length that is approximately 50% of the axial length “L+X+Y.” 
     In the proximal section  326 B of the tapered outer surface  322 B, the outer geometry of the broach  302 B defined by the stepped planes  314 B is the same as the corresponding outer geometry of the sleeve  224 B defined by the stepped walls  274 B. In other words, the number of stepped planes  314 B is equal to the number of stepped walls  274 B, and each stepped plane  314 B has the same maximum medial-lateral dimension, the same maximum anterior-posterior dimension, and the same axial height as the corresponding stepped wall  274 B. As a result, the broach  302 B is configured to define a cavity in the patient&#39;s femur that includes a proximal section that is substantially the same as the sleeve  224 B such that the sleeve  224 B is fitted into that section. 
     In the distal section  328 B of the tapered outer surface  322 B the number of stepped planes  314 B is equal to the number of stepped walls  274 B, and each stepped plane  314 B has the same axial height as the corresponding stepped wall  274 B. However, the maximum medial-lateral dimension and the maximum anterior-posterior dimension of each stepped plane  314 B are smaller than the maximum medial-lateral dimension and the maximum anterior-posterior dimension of the corresponding stepped wall  274 B. In other words, the outer geometry of the broach  302 B defined by the stepped planes  314 B is smaller than the corresponding outer geometry of the sleeve  224 B defined by the stepped walls  274 B. As a result, the broach  302 B is configured to define a cavity in the patient&#39;s femur that includes a distal section that is smaller than the sleeve  224 B such that the sleeve  224 B is press fit into that section. 
     In the illustrative embodiment, the maximum medial-lateral dimension of each stepped plane  314 B in the distal section  328 B is 0.35 mm less than the maximum medial-lateral dimension of the corresponding stepped wall  274 B of the sleeve  224 B. Similarly, the maximum anterior-posterior dimension of each stepped plane  314 B in the distal section  328 B is 0.35 mm less than the maximum anterior-posterior dimension of the corresponding stepped wall  274 B of the sleeve  224 B. It should be appreciated that in other embodiments the dimensions of the broach  302 B may be adjusted to provide greater or less press fit for the sleeve  224 B. 
     Referring now to  FIGS.  26 - 35   , a plurality of augments  340  of the femoral components  200  are shown. The augments  340  include a plurality of distal augments  342 ,  344  (see  FIGS.  26 - 29   ) and a plurality of posterior augments  346 ,  348 . As described above, each of the augments  340  includes a mounting plug  256  that is configured to be received in the mounting aperture  250 . Each augment  340  also includes a retention mechanism  350  configured secure the corresponding augment  340  to the femoral component  210 , as described in greater detail below. In the illustrative embodiment, the augments  340  are formed from any suitable implant-grade metallic material such as, for example, cobalt-chromium, titanium, or stainless steel. 
     As shown in  FIGS.  26 - 27   , the distal augment  342  includes a wedge-shaped body  358  that has a proximal surface  360 , a distal surface  362  positioned opposite the proximal surface  360 , and a side wall  364  that connects the surfaces  360 ,  362 . The side wall  364  includes a tapered anterior surface  366  and a tapered posterior surface  368 , which extend obliquely relative the surfaces  360 ,  362 . When the distal augment  342  is secured to the femoral component  210 , the tapered anterior surface  366  is configured to engage the anterior chamfer surface  236  of the femoral component  210 , and the tapered posterior surface  368  is configured to engage the posterior chamfer surface  234  of the femoral component  210 . 
     As shown in  FIG.  26   , the proximal surface  360  of the distal augment  342  has a rim surface  370  and a side wall  372  that extends inwardly from the rim surface  370 . The side wall  372  cooperates with a bottom surface  374  to define a pocket  376  in the proximal surface  360 . The upper end  378  of the mounting plug  256  is positioned an opening  380  defined in the bottom surface  374 , and the body  382  of the plug  256  extends through the augment body  358  to an end  384  positioned below the body  358 , as shown in  FIG.  27   . The end  384  of the body  382  is divided into four legs  386 . 
     The retention mechanism  350  of the augment  340  includes a fastener  388  that is threaded into the body  382  of the mounting plug  256 . The fastener  288  includes a socket in which a driver may be inserted to rotate the fastener  288 . When the fastener  388  is rotated in a first direction, the fastener  388  is driven toward the end  384  of the body  382 , causing the legs  386  to expand outward; when the fastener is rotated in the opposite direction, the fastener  388  moves away from the end  384  of the body  382  such that the legs  386  are permitted to retract. 
     The distal surface  362  of the wedge-shaped body  358  is configured to engage the distal surface  230  of the femoral component  210 . In the illustrative embodiment, a plurality of feet  390  extend from the distal surface  362  of the wedge-shaped body  358 . Each foot  390  is sized to be positioned in the cement pocket  240  of the femoral component  210 . As shown in  FIG.  27   , the wedge-shaped body  358  also has a thickness  392  defined between the distal surface  362  and the proximal surface  360 . 
     As shown in  FIGS.  28 - 29   , the distal augment  344  includes a wedge-shaped body  400  that has a proximal surface  402 , a distal surface  404  positioned opposite the proximal surface  402 , and a side wall  406  that connects the surfaces  402 ,  404 . The side wall  406  includes a tapered anterior surface  408  and a tapered posterior surface  410 , which extend obliquely relative the surfaces  408 ,  410 . When the distal augment  344  is secured to the femoral component  210 , the tapered anterior surface  408  is configured to engage the anterior chamfer surface  236  of the femoral component  210 , and the tapered posterior surface  410  is configured to engage the posterior chamfer surface  234  of the femoral component  210 . 
     The side wall  406  has a posterior notch  412  defined therein. As shown in  FIGS.  28 - 29   , the notch  412  is defined by a substantially planar proximal surface  414  extending parallel to the proximal surface  402  and anteriorly from an edge of the tapered posterior surface  410  and a substantially planar posterior surface  416  extending orthogonal to the proximal surface  414 . The notch  412  is sized to receive the posterior augment  348 , as described in greater detail below. 
     As shown in  FIG.  28   , the proximal surface  402  of the distal augment  344  has a configuration similar to the proximal surface  360  of the distal augment  342 . The surface  402  has a rim surface  420  and a side wall  422  that extends inwardly from the rim surface  420 . The side wall  422  cooperates with a bottom surface  424  to define a pocket  426  in the proximal surface  402 . The upper end  428  of the mounting plug  256  is positioned an opening  430  defined in the bottom surface  424 , and the body  432  of the plug  256  extends through the augment body  358  to an end  384  positioned below the body  358 , as shown in  FIG.  29   . The end  384  of the body  432  is divided into four legs  386 . 
     The retention mechanism  350  of the augment  340  includes a fastener  438  that is threaded into the body  432  of the mounting plug  256 . The fastener  438  includes a socket in which a driver may be inserted to rotate the fastener  438 . When the fastener  438  is rotated in a first direction, the fastener  438  is driven toward the end  384  of the body  432 , causing the legs  386  to expand outward; when the fastener is rotated in the opposite direction, the fastener  438  moves away from the end  384  of the body  432  such that the legs  386  are permitted to retract. 
     The distal surface  404  of the wedge-shaped body  400  is configured to engage the distal surface  230  of the femoral component  210 . In the illustrative embodiment, a plurality of feet  440  extend from the distal surface  404  of the wedge-shaped body  400 . Each foot  440  is sized to be positioned in the cement pocket  240  of the femoral component  210 . As shown in  FIG.  29   , the wedge-shaped body  358  also has a thickness  442  defined between the distal surface  404  and the proximal surface  402 . 
     As shown in  FIGS.  27  and  29   , the thickness  442  of the augment  344  is greater than the thickness  392  of the augment  342 . In the illustrative embodiment, the thickness  392  is equal to approximately 4 millimeters, and the thickness  442  is equal to approximately 12 millimeters. It should be appreciated that in other embodiments the thicknesses of the augments may increase or decrease depending with the size of the other femoral components  200 . Additionally, as shown in  FIGS.  27  and  29   , the distal surface  404  of the augment  344  is wider than distal surface  362  of the augment  342 . 
     As described above, the femoral components  200  also include posterior augments  346 ,  348 . Each of the posterior augments  346 ,  348  includes a body  450  having an anterior surface  452  and a posterior surface  454  positioned opposite the anterior surface  452 . As shown in  FIGS.  30  and  32   , each of the posterior augments  346 ,  348  includes the mounting plug  256 , which has a configuration similar to the configurations described above in regard to the distal augments  342 ,  344 . 
     The posterior surface  454  of the body  450  is configured to engage the posterior fixation surface  232  of the femoral component  210 . In the illustrative embodiment, a plurality of feet  456  extend from the posterior surface  454 . Each foot  456  is sized to be positioned in the cement pocket  240  of the femoral component  210 . As shown in  FIG.  30   , the posterior augment  346  has a thickness  460  defined between the anterior surface  452  and the posterior surface  454 ; as shown in  FIG.  32   , the posterior augment  348  has a thickness  462  defined between the anterior surface  452  and the posterior surface  454 . In the illustrative embodiment, the thickness  462  of the augment  348  is greater than the thickness  460  of the augment  346 . 
     In use, the augments  340  may be attached to the femoral component  210  in the same sequence, regardless of the combination of augments  340  used. For example, as shown in  FIGS.  30 - 31   , the posterior augment  346  may be attached first to the posterior fixation surface  232  of the femoral component  210  via the mounting plug  256 , which is inserted into the aperture  260 . Using the fastener (not shown) of the mounting plug  256 , the legs  386  of the mounting plug  256  are expanded into engagement with the wall  252  defining the aperture  250 , thereby securing the augment  346  to the posterior fixation surface  232 . 
     The distal augment  342  may then be attached to the distal fixation surface  230 . As shown in  FIG.  31   , the mounting plug  256  is aligned with the aperture  250  of the distal fixation surface  230 . The distal augment  342  may be advanced downward such that the plug  256  is received in the aperture  250 . The fastener  388  may then be operated to engage the wall  252  with the legs  386  of the mounting plug  256 , thereby securing the augment  342  to the distal fixation surface  230 . 
     As shown in  FIGS.  32 - 35   , another combination of augments  340 —in this case, the largest augments  344 ,  348 —may attached in the same sequence as the augments  342 ,  346 . To do so, the posterior augment  348  may be attached first to the posterior fixation surface  232  of the femoral component  210  via the mounting plug  256 , which is inserted into the aperture  260 . Using the fastener (not shown) of the mounting plug  256 , the legs  386  of the mounting plug  256  are expanded into engagement with the wall  252  defining the aperture  250 , thereby securing the augment  348  to the posterior fixation surface  232 . 
     The distal augment  344  may then be attached to the distal fixation surface  230 . To do so, the distal augment  344  is positioned above the distal fixation surface  230  as shown in  FIG.  33   . The augment  344  may then be rotated as shown in  FIG.  34    and advanced downward. 
     As shown in  FIG.  34   , the user may slide posterior edge of the distal augment  344  under the posterior augment  348  to “hook” the distal augment  344  into position. In doing so, the posterior augment  348  is advanced into the posterior notch  412  of the distal augment  344 . When the plug  256  of the distal augment  344  is received in the aperture  250  and the augment  344  is properly seated as shown in  FIG.  35   , the posterior augment  348  remains in the posterior notch  412 . The fastener  388  may then be operated to engage the wall  252  with the legs  386  of the mounting plug  256 , thereby securing the augment  348  to the distal fixation surface  230 . 
     As shown in  FIGS.  36 - 37   , the femoral components  200  may be assembled to form a femoral orthopaedic prosthesis. In  FIG.  36   , the smallest femoral sleeve  224  and the smallest augments  342 ,  346  are assembled with the femoral component  210  to form prosthesis  470 . In  FIG.  37   , the largest femoral sleeve  224 B and the largest augments  344 ,  348  are assembled with the femoral component  210  to form prosthesis  472 . As shown in  FIGS.  36 - 37   , the distal-most points  474  of the condyle surfaces  12 ,  14  define a joint line of the femoral orthopaedic prosthesis when the patient&#39;s leg is extension. In  FIG.  36   , the joint line is indicated by line  476 ; in  FIG.  37   , the joint line is indicated by line  478 . 
     The illustrated assemblies have maximum axial lengths from planes at the proximal ends  266 ,  266 B (the planes shown at  480  and  482 ) to the plane of the joint line, shown at  476  in  FIG.  36    and at  478  in  FIG.  37   . These maximum axial lengths of the assemblies are shown at AL 1  in  FIGS.  36    and AL 2  in  FIG.  37   . In the illustrative embodiment, AL 2  is longer than AL 1  by the dimension “X+Y”, that is the axial length of the sleeve  224 B beyond the length “L” of the smallest sleeve  224 . 
     As can also be seen from a comparison of  FIGS.  36 - 37   , using the larger sleeve  224 B distalizes the joint line  476  to the position  478  by the offset distance o 1 . This offset distance o 1  also corresponds with the dimension “X+Y”. Similarly, using the sleeve  224 A distalizes the joint line by the dimension “X” relative to the joint line  476 . 
     Since the geometries of the stepped bodies  264 ,  264 B,  264 C of the different sizes of sleeves  224 ,  224 A,  224 B are the same through axial length “L”, the surgeon can prepare the distal femur using the broach  302  to receive the smallest size of femoral sleeve  224 . If the surgeon determines intraoperatively that the joint line should be distalized, the surgeon may use any of the other sizes of sleeve  224 A,  224 B, and the proximal portion of the larger size sleeve will fit within the opening prepared in the femur to receive the smaller sleeve and extend distally from the bone by the distance “X” or “X+Y” o thereby distally offset the joint line. In the illustrative embodiment, the thickness  442  of the distal augment  344  is equal to the offset distance o 1  such that the sleeve  224 B the prosthesis  472  may be stabilized when the joint line is distalized. The surgeon can therefore accomplish this distalization without any further preparation of the bone cavity. 
     Another system providing the option of distalizing the joint line is disclosed in the application for United States Patent filed concurrently herewith entitled “Knee Prosthesis System with Standard and Distally Offset Joint Line,”, filed by Peter J. James, Richard E. Jones, Benjamin J. Sordelet, Timothy G. Vendrely and Stephanie M. Wainscott, which is incorporated by reference herein in its entirety. 
     While the disclosure has been illustrated and described in detail in the drawings and foregoing description, such an illustration and description is to be considered as exemplary and not restrictive in character, it being understood that only illustrative embodiments have been shown and described and that all changes and modifications that come within the spirit of the disclosure are desired to be protected. 
     There are a plurality of advantages of the present disclosure arising from the various features of the method, apparatus, and system described herein. It will be noted that alternative embodiments of the method, apparatus, and system of the present disclosure may not include all of the features described yet still benefit from at least some of the advantages of such features. Those of ordinary skill in the art may readily devise their own implementations of the method, apparatus, and system that incorporate one or more of the features of the present invention and fall within the spirit and scope of the present disclosure as defined by the appended claims.