Abstract:
The disclosure includes a method for providing prosthetic implants for a total knee replacement procedure. This method includes receiving data representative of a knee joint of a patient and determining anatomical parameters from the received data. The method also includes creating a graphical model of the knee joint based on the determined anatomical parameters, and providing a femoral component of a knee joint implant based on at least one of the determined anatomical parameters and the graphical femoral portion. This method also includes providing at least one cutting instrument configured to facilitate removing a portion of the femur of the patient based on at least one of determined anatomical parameters and the graphical model.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
       [0001]    This application claims the benefit under 35 U.S. §1 19(e) of U.S. Non-Provisional application Ser. No. 11/454,109 entitled Implant for Knee Replacement, filed Jun. 15, 2006. This application also claims the benefit under 35 U.S. §1 19(e) of U.S. Provisional Application No. 60/690,653 entitled Gender Specific Implant and Packaging, filed Jun. 15, 2005, the contents of which are herein incorporated by reference in their entirety. This application also claims the benefit under 35 U.S. §1 19(e) of U.S. Provisional Application No. 60/755,804 entitled Gender Specific Implant and Packaging, filed Jan. 3, 2006, the contents of which are herein incorporated by reference in their entirety. 
     
    
     FIELD OF THE INVENTION 
       [0002]    The present invention relates to gender specific medical treatments, medical implants, and therapeutics. 
       BACKGROUND OF THE INVENTION 
       [0003]    Some fields of study recognize and account for differences between men and women better than others. Psychologists, for example, may choose different therapeutic techniques to address certain emotional issues with a man than with a woman. Personal trainers likewise may employ different physical training regimen for men than for women, and may have different target goals for cardiovascular and muscular development. 
         [0004]    Some fields of medical study may even consider gender during diagnosis of an illness or injury, but most do not identify or consider gender differences in treatment protocols, medical implants, drug development, drug dosage and delivery, and the like. Instead, many treatments only account for differences based on body weight, or create distinctions only between infants, children and adults while ignoring potentially significant differences based on gender. In many instances, therefore, there has been little, if any, effort to refine medical science to account for differences between men and women. 
         [0005]    One reason that medical science has not advanced to account for gender differences in treatment may be due in part to a widely held perception that sexual dimorphism is relatively low in humans when compared to other animals, and therefore the differences often are ignored or overlooked. Sexual dimorphism is the systematic difference in form between individuals of different gender in the same species. This may include differences in size, color, or the presence of gender defining body parts, such as horns or antlers. While in humans, the male and female forms are perceived differently, they tend to have a low level of sexual dimorphism when compared to other species. For example, the body masses of both male and female humans are approximately normally distributed. 
         [0006]    However, despite this relative low-level sexual dimorphism when compared to other species, there are physiological, muscular, and skeletal differences in men and women that are of particular relevance to improved medical treatment. Many of these differences are present even between men and women of similar height, weight, and build, but currently are not taken into consideration when treating a patient. For example, the female brain has more intercellular connections than the male brain, which may account for why women generally are likely to recover more of their speech abilities after a stroke than men, yet medical treatment for men and women is virtually identical. Additionally, male bones tend to be larger in size, having greater lengths, thicknesses, and densities. Similarly, the joints in male and female bodies differ. For example, the notch width at the end of the femur in the knee joint tends to be wider in males than in females. Despite these differences, medical implants currently are limited to unisex designs. Further examples of differences between men and women may be found in metabolic rates, diurnal changes, range of motion, pH and hormonal changes, elasticity of body tissue, and susceptibility to diseases or medical conditions. 
         [0007]    For example, males and females metabolize medications at different rates and react differently to different types of medications. As a result of these differences, females may metabolize some analgesics and adjuvant drugs at different rates than men, among them oxycodone, tramadol, fentanyl, bupivacaine, and diazepam. Similarly, males may respond more favorably to tricyclic agents and females may get greater relief from selective serotonin reuptake. 
         [0008]    In spite of these differences, medical practitioners tend to treat male and female patients with a gender-neutral approach. At best, medicines may be prescribed based on weight or body mass index (BMI), without taking into account other, potentially more significant gender differences. Medical implants and instruments are provided in limited sizes (e.g., small, medium, and large), but each having similar geometric proportions, the same material construction, the same surface treatment, and the same therapeutic coating for men and women. In short, medical science has made little effort to account for many potentially significant gender differences. 
         [0009]    Perhaps another reason gender differences have not been incorporated into medical science is the additional complexity it would introduce for patients and health professionals. It may be difficult, for example, for a doctor, nurse, or pharmacist to keep track of different gender-specific dosage amounts, dosage rates, drug combinations, and the like. Likewise, a couple, such as a husband and wife, where both are being treated for the same medical condition may become confused if presented with different medicines, or with different dosage instructions (e.g. dosage amounts, dosage frequency, etc.) for medicines with the same active ingredient. Additionally, if both patients are taking the same brand of medication, it may be difficult to distinguish each person&#39;s medicine from the other. 
         [0010]    Regardless of the reason for the current state of medical science, it would be desirable to have more sophisticated medical treatments that better account for gender differences. 
       SUMMARY OF THE INVENTION 
       [0011]    The present invention provides a system and method for accounting for gender specific differences in medical treatment. This is achieved first by taking into account these differences so that a patient&#39;s therapy and treatment is more closely tailored to them. This includes, for example, providing gender specific treatment, medical devices, medicines, and/or instrumentation. These differences may result in different techniques being provided for treating bones or joints (such as the knee, hip, or spine), differences in drug selection, drug delivery and dosage, different implant designs, and different treatment for soft tissue repair. These and other non-limiting examples are further discussed in detail below. 
         [0012]    In addition, the invention also may involve improved identification systems that help patients or health professionals avoid or reduce potential confusion that may result from the availability of gender specific treatment options. For example, the medical treatment system can include a medical device identification system which differentiates use for male and female patients. The medical device identification system includes a container adapted to receive a medical device and a gender specifier. The gender specifier is used to identify the gender the medical device is designed for. The gender specifier can be incorporated into a label, where the gender specifier can be in text form, symbolic form or color coded. For example, the gender specifier can be in the text form “MALE” or “FEMALE.” 
         [0013]    The gender specifier may also be an electronic device, such as an RFID tag that is associated or packaged with the device or medicine so that it can be readily identified and associated for use with a particular gender. This embodiment of the invention may be of particular use for sterilized products, medicines that are sealed in a container, or in other situations where it is difficult to visually confirm for which sex the product is intended. 
         [0014]    Alternatively, the medical treatment system may include a medication container having a gender-specific labeling system. The label system may provide information identifying the contents and gender-specific instructions regarding usage of the enclosed medicine. The usage information may include, for example, the recommended dosage for one or both genders. Thus, the gender specifier may be dosage information, but also it may be in a text form, such as “FEMALE” and “MALE,” or alternatively may be in the form of a color coding or in symbolic representations. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0015]    A more complete understanding of the present invention, and the attendant advantages and features thereof, will be more readily understood by reference to the following detailed description when considered in conjunction with the accompanying drawings wherein: 
           [0016]      FIG. 1  depicts an exemplary knee joint; 
           [0017]      FIG. 2  depicts an exemplary prosthetic knee joint; 
           [0018]      FIG. 3  depicts an exemplary femoral component of a male prosthetic knee joint; 
           [0019]      FIG. 4  depicts an exemplary tibial component of a male prosthetic knee joint; 
           [0020]      FIG. 5  depicts an exemplary femoral component of a female prosthetic knee joint; 
           [0021]      FIG. 6  depicts an exemplary tibial component of a female prosthetic knee joint; 
           [0022]      FIG. 7  depicts an another exemplary femoral component of a prosthetic knee joint; 
           [0023]      FIG. 8  depicts an exemplary rotatable tibial component of a prosthetic knee joint; 
           [0024]      FIG. 9  depicts a partial cross section of the rotatable tibial component of  FIG. 8 ; 
           [0025]      FIG. 10  depicts a platform of a rotatable tibial component of a prosthetic knee joint; 
           [0026]      FIG. 11  depicts a platform of a rotatable/translatable tibial component of a prosthetic knee joint; 
           [0027]      FIG. 12  depicts another platform of a rotatable/translatable tibial component of a prosthetic knee joint; 
           [0028]      FIG. 13  depicts an exemplary male patella with pegs or contact points arranged based on the male anatomy; 
           [0029]      FIG. 14  depicts an exemplary female patella with pegs or contact points arranged based on the female anatomy; 
           [0030]      FIG. 15  depicts an exemplary bi-compartmental femoral component of a male prosthetic knee joint; 
           [0031]      FIG. 16  depicts an exemplary bi-compartmental femoral component of a female prosthetic knee joint; 
           [0032]      FIG. 17  depicts a schematic diagram of a computer navigation system of the present invention; 
           [0033]      FIG. 18  depicts a triangular mapping of a femur portion of a knee joint; 
           [0034]      FIG. 19  depicts a triangular mapping of a tibia portion of a knee joint; 
           [0035]      FIG. 20  depicts an exemplary vascular stent; 
           [0036]      FIG. 21  depicts an exemplary female vascular stent; 
           [0037]      FIG. 22  depicts a cross sectional view of an embodiment of the stent of  FIG. 20 ; 
           [0038]      FIG. 23  depicts an exemplary medical implant including an energy sink; 
           [0039]      FIG. 24  depicts a representative packaging material of the present invention; 
           [0040]      FIG. 25  depicts a representative label affixed to the packaging material of  FIG. 24 ; 
           [0041]      FIG. 26  depicts a representative medicine container of the present invention; 
       
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
       [0042]    The present invention provides a system and method for gender specific medical treatment. As mentioned above, gender differences are often ignored when determining how to treat a medical condition. It is believed that accounting for one or more of these differences during treatment may greatly improve the quality of care and degree of recovery that a patient experiences. 
         [0043]    One example where medical science currently applies a unisex approach is in the treatment of bones and joints. Three non-limiting examples discussed below—namely treatment of the knee, hip, and spine —illustrate how the invention may be used to improve the quality of care a patient may receive when gender differences are taken into account. 
         [0044]    Knee replacements, for instance, are about twice as likely to be performed on women as on men. There are gender-specific differences in the bones and joint associated with the knee that are not currently taken into account in this area of medicine. For example, the female patella is generally thinner and narrower in superior and inferior dimensions, while in men it is generally wider in proportion. 
         [0045]    Referring to  FIG. 1 , there is shown an anterior view of a knee joint  10 , wherein the patella is not shown. The knee joint  10  includes a femoral portion  12  having medial and lateral condyles  14  and  16 . A trochlear groove  18  is interposed between the medial and lateral condyles  14  and  16 , allowing for tracking of the patella along the end portion of the femur  12  as the knee joint  10  is flexed and extended. A tibial portion  20  of the knee joint  10  includes a tibial plateau  22 , including medial and lateral menisci  24  and  26  disposed on the tibial plateau  22 . The medial and lateral condyles  14  and  16  abut the tibial plateau  22 , engaging the medial and lateral menisci  24  and  26  allow for rotation of the tibia  20  with respect to the femur  12  and shock absorption between the femur  12  and tibia  20 . A central longitudinal axis of the femur portion  12  is aligned at an angle a with respect to a central longitudinal axis of the tibial portion  20 . 
         [0046]    Depending upon the degree and type of injury, a total or partial knee replacement procedure can be performed when a knee joint  10  is damaged. A total knee replacement may involve replacing or repairing up to three bone surfaces, namely the medial and lateral condyles  14  and  16  of the femur  12 , the tibial plateau  22  of the tibia  20 , and the back surface of the patella. Referring to  FIG. 2 , an exemplary prosthetic knee  28  includes a femoral component  30  and a tibial component  32 . The femoral component  30  is configured to curve about the cut end portions of the medial and lateral condyles  14  and  16 , having a trochlear groove  34  therein to allow tracking of the patella about the femoral component  30  as the knee joint  10  is flexed and extended. The tibial component  32  includes flat platform  36  with a cushioning material  38 , replacing the medial and lateral meniscus  24  and  26 . 
         [0047]    The femoral and tibial components  30  and  32  cooperate to permit normal knee-joint functioning. The femoral and tibial components  30  and  32  are designed similar in size and shape to average knee joints, and have a range of sizes to span the normal size ranges of the knee joints. 
         [0048]    As previously discussed, there are many skeletal differences between men and women, including bone structure, configuration, size, length, thickness, density, and geometric proportion. The male femur, for example, tends to be proportionally wider, has a greater thickness, and a wider trochlear groove. Additionally, because of the differences between the male and female pelvic structures, the angular relationship a. between the femur and the tibia in male and female knees is different. Currently, these differences are not accounted for in prosthetic design, whereas in the present invention one or more of these differences could be taken into account to provide gender-specific prosthetic design. 
         [0049]    Thus, one aspect of the present invention is directed to a prosthetic knee joint that is configured and dimensioned for gender specific use. To improve articulation for women, for instance, the prosthetic knee joint may have a reduced bearing surface, such as being reduced by 10 percent or more in comparison to a male prosthetic knee design. The reduced bearing surface would allow greater range of motion of the implant corresponding to the greater range of motion typically exhibited in women. Overall, the implant for women may also be significantly thinner, such as being at least 5 percent thinner, at least 10 percent thinner, or alternatively at least 20 percent thinner than implants for men. A formal prosthetic knee for women may also have one or more of the following: thinner runners to help improve range of motion, lesser amount of metal, or greater flexibility. 
         [0050]    If the female implant is significantly thinner or has a much smaller surface area contacting bone than a male implant, it may be desirable to provide more ingrowth surface on the female implant in order to enhance fixation. Fixation can also be increased by using a different amount or configuration of bone cement, the grouting material frequently used for fixation of a prosthetic component. In this regard, the present invention also contemplates female specific and male specific bone cement, with the composition of the female bone cement differing from the male bone cement. For example, fillers could be added to the PMMA (the principal component of the bone cement) to change the mechanical properties. Additionally, other components (such as an antibiotic) can be selected depending on whether the intended recipient is a male or a female. In this regard, a female bone cement may have added components to address the osteoporotic bone found in women. Such components include calcium supplements and other agents for promoting an osteogenic or osteoconductive effect (or slowing the process of bone demineralization). 
         [0051]    Referring to  FIG. 3 , a male femoral component  40  of a knee joint implant of the present invention is provided. The femoral component  40  includes medial and lateral condyle portions  42  and  44  each having a width W 1  and a radius R 1 . A trochlear groove  46  is disposed between the medial and lateral condyle portions  42  and  44  and has a width W 2 . The widths W 1  and W 2  and the radius R 1  of the femoral components  40  are provided in a range of sizes to span the normal size ranges of male human knee joints. Additionally, the thickness t 1  and the material densities of the femoral components  40  are selected to correspond to male bone thickness and densities. 
         [0052]    Referring to  FIG. 4 , a male tibial component  48  of a knee joint of the present invention is provided. The tibial component  48  includes flat platform  50 , having a substantially oval shape, wherein the cushioning material  52  replaces the medial and lateral meniscus  24  and  26 . A bone spike  54  is included for insertion into the prepared end of the tibia, securing the tibial component  48  to the tibia. The bone spike  54  can be substantially conical in shape, having a maximum diameter d 1  and length l  1 . 
         [0053]    Referring to  FIG. 5 , a female femoral component  60  of a knee joint implant of the present invention is provided. The femoral component  60  includes medial and lateral condyle portions  62  and  64  each having a width W 3  and a radius R 2 . A trochlear groove  66  is disposed between the medial and lateral condyle portions  62  and  64  and has a width W 4 . The widths W 3  and W 4  and the radius R 2  of the femoral components  60  are provided in a range of sizes to span the normal size ranges of female human knee joints. Additionally, the thickness t 2  and the material densities of the femoral components  60  are selected to correspond to female bone thickness and densities. 
         [0054]    Referring to  FIG. 6 , female tibial component  70  of a knee joint of the present invention is provided. The tibial component  70  includes flat platform  72 , having a substantially elongated oval shape, wherein the cushioning material  74  replaces the medial and lateral meniscus  24  and  26 . A bone spike  76  is included for insertion into the prepared end of the tibia, securing the tibial component  70  to the tibia. The bone spike  74  can be substantially conical in shape, having a maximum diameter d 2  and length h. 
         [0055]    As previously discussed, the male femoral component  40  will generally have greater widths W 1  and W 2  and the radius R 1 , thus bearing surface area, than that of comparable female femoral component  60  widths W 3  and W 4  and the radius R 2 . Similarly, the male femoral component  40  will generally have a greater material thickness t 1  than that of thickness t 2  of a comparable female femoral component  60 . Thus, a “large” size for a male prosthetic knee joint may differ significantly in size, proportion, and construction from a large-sized prosthetic knee joint for women. Furthermore, as shown in  FIG. 5 , an upper section  68  of the female femoral component  60  can be generally narrower than that of a comparably male femoral component  40 , to accommodate structural differences between the female and male femurs. In other words the female femoral component  60  design can have scalloped edges compared to the male femoral component  40  design. Additionally, the thickness, the material densities, and the material composition of the femoral components  40  and  60  may be selected to correspond to different male and female bone thickness and densities. Additional dimensions of the femoral portion of the knee joint can be utilized in the design and configuration of the femoral components  40  and  60 . 
         [0056]    Similar to the femoral components  40  and  60 , the tibial components  58  and  70  are designed and configured for use in replacement of the knee joint in males and females. The dimensions of the tibial components once again may be provided in a range of sizes to span the normal size ranges of male and female human knee joints. As shown in  FIGS. 4 and 6 , the male platform  50  has a substantially oval shape, whereas the female platform  72  has an elongated oval shape. The shapes of the platforms  50  and  72  are selected to accommodate the differences in sizes and bearing surface areas of the corresponding male and female femoral components  48  and  60 . Additionally, the thickness and the material densities of the tibial components are selected to correspond to or function with male and female bone thickness, densities, geometry, range of motion, or the like. Furthermore, additional dimensions of the tibial portion of the knee joint can be utilized in the design and configuration of the tibial components  48  and  70 . 
         [0057]    Thus, a gender-specific design may be identified by one component having less material than for the opposite sex. Furthermore, additional dimensions of the femoral portion of the knee joint can be utilized in the design and configuration of the femoral components. One or more of these dimensions may be varied so that an implant is more suited to a male or female patient. Thus, an implant design may be considered gender-specific if one or more of these parameters has been selected to better match either a male or female. 
         [0058]    A gender-specific prosthetic design may also be identified by comparing relative differences that exist between a female design and a male design. For example, if one or more dimensions (e.g., bearing surface area, widths, radii, curvature, thickness of material, amount of metal, range of motion, flexibility, etc.) or relative proportions (e.g., relative width or relative differences in angles, minimum or maximum sizes, etc.) or an implant design for one sex varies by more than 5 percent, or alternatively by 10 percent or more, or even by about 20 percent or more, from an implant designed for the opposite sex, then the design may qualify as being gender-specific. 
         [0059]    Referring to  FIG. 7 , another femoral component  80  of a knee joint implant of the present invention is provided. The femoral component  80  includes medial and lateral condyle portions  82  and  84 . The medial condyle portion  82  has a width Wm and a radius Rm and the lateral condyle portion  84  has a width WL and a radius RL, wherein the width Wm and WL can be of equal dimension, or in the alternative, the widths Wm and WL can be of non-equal dimension. Similarly, the medial and lateral condyle portions  82  and  84  radii Rm and RL can be of equal dimension, or in the alternative, radii Rm and RL can be of non-equal dimension. In this regard, the size differences between the widths and/or radii of the medial and lateral condyle portions can be at least 5 percent, 10 percent, or 20 percent. A trochlear groove  86  is disposed between the medial and lateral condyle portions  82  and  84  and has a width W 1 . 
         [0060]    In this manner, the widths Wm and WL and the radii Rm and RL of the femoral components  80  can be provided in a range of sizes to more precisely emulate the size and dimensions of a male or female human knee joints. For example, the radii R m  and RL of the medial and lateral portions  82  and  84  of the femoral component  80  can be selected such that the radius R m  of the medial condyle portion is larger with respect to the radius RL of the lateral condyle portion. As such, the radii Rm and RL of the medial and lateral portions  82  and  84  form a substantially partial conical surface. Additionally, the thickness t 3  and the material densities of the femoral components  80  are selected to correspond to male or female bone thickness and densities. 
         [0061]    As previously discussed, a male femoral component will generally have greater widths Wm and WL and the radii Rm and RL, thus bearing surface areas, than that of a comparable female femoral component widths Wm and WL and the radii Rm and RL, Similarly, the male femoral component will generally have a greater material thickness t 3  than that of thickness of a comparable female femoral component. Thus, a “large” size for a male prosthetic knee joint may differ significantly in size, proportion, and construction from a large-sized prosthetic knee joint for women. Furthermore, as shown in  FIG. 5 , an upper section of the female femoral component can be generally narrower than that of a comparably sized male femoral component to accommodate structural differences between the female and male femurs. In other words a female femoral component design can have scalloped edges compared to the male femoral component design. Additionally, the thickness, the material densities, and the material composition of the femoral components may be selected to correspond to different male and female bone thickness and densities. Additional dimensions of the femoral portion of the knee joint can be utilized in the design and configuration of the femoral components. 
         [0062]    Referring to  FIG. 8 , a tibial component  90  of a knee joint of the present invention is provided. The tibial component  90  includes a platform  92 , having a substantially oval shape, wherein a cushioning material  94  replaces the medial and lateral meniscus  24  and  26 . A bone spike  96  is included for insertion into the prepared end of the tibia, securing the tibial component  90  to the tibia. The bone spike  96  can be substantially conical in shape, having a maximum diameter d 1  and length Ii. The platform  92  can be rotatably connected to the bone spike  96 , such that the platform  92  can rotated with respect to the central longitudinal axis “A” of the bone spike  96 . 
         [0063]    In an embodiment as shown in  FIG. 9 , the platform  92  includes a slotted section  98 , in which a head portion  100  of the bone spike  96  is positioned. The slotted section  98  is configured to capture the head portion  100  of the bone spike  96 , securing the head portion  100  within the slotted section  98 , yet allowing the platform  92  to rotate with respect with the bone spike  96 . In this manner, the platform  92  can rotate with respect to a femoral component as the knee joint is moved between flexion and extension, thereby decreasing the frictional forces between the contacting surfaces of the femoral component and a cushioning material of the platform  92 . Furthermore, the rotation of the platform  92  can decrease the stresses provided on the implant/bone interface, decreasing the likelihood of failure and increasing the life expectancy of the implant. It is contemplated that the other rotational, translation, and positional configurations of the platform  92  with respect to the bone spike  96  can be provided to further increase the efficiency of emulating a natural knee joint and accounting for the anatomical differences between male and female joints. 
         [0064]    Referring to  FIG. 10 , the bone spike  96  can be centrally positioned on the flat platform  92 , such that the center  102  of the platform  92  is aligned along the central longitudinal axis of the bone spike  96 . Alternatively, the bone spike  96 ′ can be positioned offset from the center  102  of the platform  92 , such that the center  102  of the platform  92  is rotatable about the bone spike  96 ′. 
         [0065]    Referring to  FIG. 11 , the platform  92  can include an elongated slotted section  104 , such that the platform  92  can slide in the anterior and posterior directions as the knee joint is moved between flexion and extension. In addition, the platform  92  can rotate with respect to the bone spike  96  as the knee joint is moved between flexion and extension. In this manner, the compound movement for the platform  92  can be used to emulate high flexion. 
         [0066]    Referring to  FIG. 12 , the platform  92  includes an angular elongated slotted section  106 , such that the platform  92  can slide substantially in the anterior/posterior and medial/lateral directions as the knee joint is moved between flexion and extension. In addition, the platform  92  can rotate with respect to the bone spike  96  as the knee joint is moved between flexion and extension. 
         [0067]    Similar to the femoral components, the tibial components  90  are designed and configured for use in replacement of the knee joint in males and females. The dimensions of the tibial components once again may be provided in a range of sizes to span the normal size ranges of male and female human knee joints. As showing in  FIGS. 4 and 6 , the male platform  50  has a substantially oval shape, whereas the female platform  72  has an elongated oval shape. The shapes of the platforms  50  and  72  are selected to accommodate the differences in sizes and bearing surface areas of the corresponding male and female femoral components  48  and  60 . Additionally, the thickness and the material densities of the tibial components are selected to correspond to or function with male and female bone thickness, densities, geometry, range of motion, or the like. Furthermore, additional dimensions of the tibial portion of the knee joint can be utilized in the design and configuration of the tibial component  90 . 
         [0068]    Referring to  FIGS. 13 and 14 , a male patella  110  and a female patella  112  are provided. As shown in these figures, the male and female patellas  110  and  112  have substantially different shapes, where the female patella  112  is more elongated with respect to the male patella  110 . As such, when replacement patellas are provided, they are provided in accordance with the gender of the patient. 
         [0069]    Furthermore, in surgical procedures requiring resurfacing of the patella surfaces, contact pegs  114  can be affixed to the surface, providing multiple point contact surfaces between the patella and the femur or femoral implant. As male and female patellas  110  and  112  have different shapes, the arrangement of the pegs  114  can be changed accordingly. As shown in  FIG. 13 , the pegs  114  are positioned in a substantially triangular configuration for the male patella, allowing for the wider surface of the male patella  110 . As shown in  FIG. 14 , the pegs  114  are positioned in a substantially linear configuration, allowing for the more linear surface of the female patella  114 . Providing such contact pegs (rather than replacing or resurfacing the entire patella) offers a number of advantages, which include greater applicability to minimally invasive procedures, reduced articulating surface area, etc. Published U.S. Patent Application Publication No. US 2003/0028196 A  1  discloses a number of such pegs or reduced bearing surface implants that can be used with the present invention. The entire content of this patent application is incorporated herein by reference. 
         [0070]    Although  FIGS. 2-14 , show total knee replacement components, the present invention is well-suited for partial knee replacement components such as uni-compartmental and bi-compartmental implants. The present invention also contemplates the use for re-surfacing and surface bearing procedures and/or components. 
         [0071]    Referring to  FIG. 15 , a bi-compartmental male femoral component  120  of a knee joint implant of the present invention is provided. The femoral component  120  includes medial and lateral components  122  and  124 . The medial component  122  includes a medial condyle portion  126  having a width W m  and a radius R m . The lateral component  124  includes a lateral condyle portion  128  having a width W L  and a radius R L , As previously discussed, the widths W m  and W L  can be of equal dimension or can be of different dimensions. Similarly, the medial and lateral condyle portions  126  and  128  radii Rm and RL can be of equal dimension or can be of non-equal dimension. A trochlear groove  130  formed by the combination of the medial and lateral components  122  and  124  is disposed between the medial and lateral condyle portions  126  and  128  and has a width W t , 
         [0072]    Referring to  FIG. 16 , a bi-compartmental female femoral component  140  of a knee joint implant of the present invention is provided. The femoral component  140  includes medial and lateral components  142  and  144 . The medial component  142  includes a medial condyle portion  146  having a width W m  and a radius R m , The lateral component  144  includes a lateral condyle portion  148  having a width W L  and a radius R L  As previously discussed, the widths W m  and W L  can be of equal dimension or can be of different dimensions. Similarly, the medial and lateral condyle portions  146  and  148  radii R m  and R L  can be of equal dimension or can be of different dimensions. A trochlear groove  150  formed by the combination of the medial and lateral components  142  and  144  is disposed between the medial and lateral condyle portions  146  and  148  and has a width W t , The widths W m  and W L  and the radii R m  and R L  of the medial and lateral components  132  and  134  are provided in a range of sizes to span the normal size ranges of female human knee joints. Additionally, the thickness t 2  and the material densities of the medial and lateral components  132  and  134  are selected to correspond to female bone thickness and densities. 
         [0073]    As previously discussed, male femoral components will generally have greater widths W m  and W L  and radii R m  and R L , thus bearing surface area, than that of comparable female femoral components widths W m  and W L  and radii R m  and R L , Similarly, the male femoral components will generally have a greater material thickness t 1  than that of thickness of a comparable female femoral component. Thus, a “large” size for a male prosthetic knee joint may differ significantly in size, proportion, and construction from a large-sized prosthetic knee joint for women. Furthermore, as shown in  FIGS. 15 and 16 , an upper section  152  of the female femoral components  142  and  144  can be generally narrower than that of a comparably male femoral components  122  and  124 , to accommodate structural differences between the female and male femurs. In other words, the upper section  152  is such that the female femoral components  142  and  144  have scalloped edges compared to the male femoral components  122  and  124 . Additionally, the thickness, the material densities, and the material composition of the femoral components  122 ,  124 ,  142 , and  144  may be selected to correspond to different male and female bone thickness and densities. Additional dimensions of the femoral portion of the knee joint can be utilized in the design and configuration of the femoral components  142  and  144 . 
         [0074]    Thus, a gender-specific design may be identified by one component having less material than for the opposite sex. Furthermore, additional dimensions of the femoral portion of the knee joint can be utilized in the design and configuration of the femoral components. One or more of these dimensions may be varied so that an implant is better suited to a male or female patient. Thus, an implant design may be considered gender-specific if one or more of these parameters has been selected to better match either a male or female. 
         [0075]    A gender-specific prosthetic design may also be identified by comparing relative differences that exist between a female design and a male design. For example, if one or more dimensions (e.g., bearing surface area, widths, radii, curvature, thickness of material, amount of metal, range of motion, flexibility, etc.) or relative proportions (e.g., relative width or relative differences in angles, minimum or maximum sizes, etc.) or an implant design for one sex varies by more than 5 percent, or alternatively by 10 percent or more, or even by about 20 percent or more, from an implant designed for the opposite sex, then the design may qualify as being gender-specific. 
         [0076]    Referring to  FIG. 17 , a computer navigation system  160  of the present invention is provided and schematically shown. The computer navigation system  160  includes a central processing unit (CPU)  162 , having a processor  164  and memory  166 , a display device  168 , and input devices, including a keyboard  170  and a stylus  172 . A computer program is stored on the CPU  162 , where the computer program can be used to aid in the selection, preparation, and insertion of implants into a patient. The stylus  172  can be used to provide single point locations or multiple point locations to outline the contours of a surface of a portion of a joint. The navigation system  160  can further include a printer  174 . 
         [0077]    An anatomical database is stored on the CPU  162  and is accessible by the computer program to determine appropriate implants for use in the patient. In an embodiment, the anatomical database includes information relating to a joint in the body of a patient, for example a knee joint. The anatomical database includes a library of joint mappings, having a broad range of joint sizes, as well as including information relating to gender differences in the joints. For example, the anatomical database can include information on bone thickness, density, the radii of the medial and lateral condyles, the widths of the medial and lateral condyles, the width of the trochlear groove, and the angular relationship of the medial and lateral condyles with respect to the central longitudinal axis of the femur for a broad range of different size joints for male and females. In other words, conventional computer navigation systems include a library or database of anatomical parameters that are used in the registration or other calibrating process, but the anatomical parameters are based on a unisex model that represents a composite of male and female anatomies. In contrast, the computer navigation system of the present invention includes a male library or database and a female library or database. The separate libraries or databases include differences in the anatomy. Exemplary differences have been discussed previously and additional gender differences are described below. Thus, with the computer navigation system of the present invention, the patient&#39;s gender is selected and the appropriate library or database is used in the registration or other calibrating process. 
         [0078]    In a method of use, the stylus  172  is used to the map the joint, with at least three points located on the joint to determine the anatomical parameters of the joint. The joint mapping is displayed on the display device  168 . Referring to  FIG. 18 , in a knee joint  10  the stylus  172  maps the femoral portion  12  of the knee joint  10 . The stylus  172  is used to locate a home point “HP” on the femur  12 , where the home point lies on the top surface on the femur  10  in a plane defined by the central longitudinal axis “A” of the femur  10 . At least two additional points “P 1 ” and “P 2 ” are located with respect to the home point, such as end surfaces of the medial and lateral condyles  14  and  16 . The three points (HP, P 1  and P 2 ) define a triangular mapping “T 1 ” of the femoral portion  12  of the knee joint  10 , which is displayed on the display device  168 . In addition to the triangular mapping, gender information is also provided. 
         [0079]    In an alternative embodiment, the display device  168  displays a generic knee joint, highlighting a point on the joint to be located using the stylus  172 . For example, a home point “HP” and the end surfaces of the medial and lateral condyles are highlighted on the generic knee joint. The stylus  172  is utilized to locate the corresponding points on the knee joint  10  of the patient. 
         [0080]    The computer program utilizes the mapped points and the gender information to provide a preliminary model for the femoral portion  12 , which is displayed on the display device  168 . The preliminary model is based on a statistical analyzing of the relationship of the mapped points and the gender information, in comparison to the knee joint database. The resulting preliminary model can include information on the radii of the medial and lateral condyles, the widths of the medial and lateral condyles, the width of the trochlear groove, and the angular relationship of the medial and lateral condyles with respect to the central longitudinal axis of the femur. Based on the preliminary model an appropriately size femoral implant can be selected for use, as well as a corresponding cutting pattern for that implant. 
         [0081]    The above system has been described as using three points to provide a triangular mapping. However, it is understood that additional information can be utilized to provide a more refined model of the femoral portion  12  of the knee joint  10 . For examples, the input device  170  can be used to map anterior and posterior points of the medial and lateral condyles, the femoral contacting surface of the medial and lateral condyles, the trochlear groove, etc. Additional information, such as the bone diameter and angular relationship between the femur and the pelvis can be utilized to refine the model. 
         [0082]    Referring to  FIG. 19 , in a similar method, the computer navigation system  160  can be used to map the tibial portion  20  of the knee joint  10 . The stylus  172  is used to locate reference points on the end portion of the tibia  20  with respect to the home point “HP” on the femur  12 . For example, the stylus  172  can be used to map points along the tibial plateau  22 , including the tibial plateau end points P 3  and P 4 , to providing a triangular model “T 2 ” of the tibia  20  as well as the angular relationship “a” between the tibia  20  and femur  12 . 
         [0083]    The computer program utilizes the mapped points and the gender information to provide a preliminary model for the tibial portion  20 , which is displayed on the display device  168 . The tibial portion  20  can be displayed either individually or in relation to the femoral portion  12 . The resulting preliminary model can be used to select an appropriately sized tibial implant, as well as a corresponding cutting pattern for that implant. The selection of the femoral and tibial implants is not only based on the inputted data, by also on the implants themselves, and their ability to function appropriately together. 
         [0084]    Other gender-specific differences may be used to further customize a medical implant such as a prosthetic knee for men or women. For instance, surfaces of the device may have different ingrowth surfaces, porosity, HA, or BMP coated or bonded to it. 
         [0085]    In addition to the knee joint, additional prosthetic implants can be designed and configured for gender specific use. For example, as noted above, the female pelvis is distinguished from that of the male by its bones being more delicate and shallower in depth. The ilia of the female pelvis are less sloped, and the anterior iliac spines more widely separated; hence the greater lateral prominence of the hips in females. The superior aperture of the lesser pelvis is larger in the female than in the male; it is more nearly circular, and its obliquity is greater. The inferior aperture is larger and the coccyx more movable. The sciatic notches are wider and shallower, and the spines of the ischia project less inward. The ischial tuberosities and the acetabula are wider apart, and the former are more everted. The pubic symphysis is less deep, and the pubic arch is wider and more rounded than in the male, where it is an angle rather than an arch. 
         [0086]    Because of the differences between the male pelvis and the female pelvis, hip configuration and alignment differ between the genders. Such differences require differing implant configurations. In accordance with the present invention, prosthetic hip implants may be designed and configured for gender specific use, taking into account the structural differences between the female and male pelvis and connecting femurs. 
         [0087]    Thus, another example of where the present invention may be used to improve currently available implant designs is in treatment of injuries to the pelvis or hip. As mentioned above, an implant designed for women may be designed to provide greater range of motion than a similar implant designed for men. Females often benefit from having a greater range of motion for hips just as they do for knees. Thus, the female design may be more flexible in the acetabular component, more flexible in the femoral stem, or have a greater modulus of elasticity (especially in more osteoporotic bone). Designing the female prosthetic so that the femoral head contacts a thinner acetabulum also may change range of motion and stability to be more suitable for women than men. 
         [0088]    Additionally, the offset for the femoral head and neck region may be different for men than women. For example, a female design may have less offset while a male design may have a greater offset to increase the lever arm. The difference in offset may be about 5 percent or greater in one embodiment, although as described above the offset may differ by 10 percent or more, or by 20 percent or more. 
         [0089]    Another way in which prosthetic designs such as the hip may incorporate gender-specific features is with the use of different ingrowth surfaces. For example, the superior portion under compression on the acetabular component may have HA coating and/or a roughened surface texture for one gender while less or no HA coating and/or a smoother surface texture for the opposite gender. Likewise, the inferior coating may be porous or fiber metal coating or porous tantalum coating so that there would be two or more ingrowth surfaces on the same gender-specific implant. 
         [0090]    Since it may be difficult to immediately recognize some of these gender-specific design differences, one or more components may be color-coded so that they may be more readily identified by visual inspection. For example, the rotating or bearing surface of the femoral head may have one color for women and another color for men. Thus, a component having a pink visible surface may signify that the gender-specific design of the implant is for women, while a black surface may signify that the gender-specific design is for men. This color-coding of one or more components may be used in place of or in conjunction with any other gender identification systems, including those described elsewhere herein. 
         [0091]    It is further contemplated the gender specific prosthetic implants can be designed and configured for use in the any joint in a body, including ankle, knee, hip, spine, neck, wrist, elbow, and shoulder. In spine treatment, for example, a nucleus pulposes implant for women may have greater elasticity or greater hydrophilic capability. Likewise for spinal implants, the shape, angle, or distance distracted between the disc space may be designed to be gender-specific for men and women. In addition, disc replacement technology may have gender-specific features such as differences in disc height or angulation changes such as lordosis or rotational angle. Likewise, a spinal cage could have gender-specific designs that vary in thickness or forced expansion. 
         [0092]    Bone cement, such as used in spine treatment or in treating other bones in the body, also may have a different viscosity for men and women, different rates of introduction into the body, or different amounts of bonding or interdigitation, especially with osteoporotic bone in females versus males. 
         [0093]    The use of gender-specific designs also may result in kits of implants, tools and devices tailored primarily for a particular gender. For instance, a kit of implants of varying sizes intended for women may have a generally smaller size than a kit of similar implants intended for men. Providing a gender-specific kit allows for the reduction or elimination of conventional kit components that might primarily be intended for use on the opposite sex. Likewise, there may be differences in the tools and instruments provided in one kit versus another due to anatomical, physiological, or other differences between men and women. One benefit of providing gender-specific kits is that it may reduce the amount of variety of devices and instruments that may be prepared for a particular surgery. The potential reduction in complexity and number of devices and instrumentation may in turn allow a physician to perform surgeries more efficiently and successfully. 
         [0094]    Sutures also may be designed to have gender-specific features. Today, suture materials are all designed to have the same properties for men and women. Under the present invention, however, suture material may have greater elasticity for females than for males. 
         [0095]    Stents are another example where a currently unisex approach could be improved by taking into account gender-specific differences. Stents are used in a wide variety of applications, such as for aneurysms, aortic, cardiac, carotid, vascular anastomosis, vascular angioplasty, and the like. As is well known stents are typically inserted in a compressed state and then expanded when in position. The expansion of stents today is the same for men and women; yet female vessel tissue tends to be more elastic than in men. Therefore, it is believed the vessels in women would apply a less resistance to an opening stent than in men. While this difference is not currently taken into account, one embodiment of the present invention would be to design a stent to require a lower opening force for women than a stent designed for men. For example, a balloon used to expand a male designed stent may apply a greater opening force than a balloon used to expand a female designed stent. 
         [0096]    Furthermore, stent expansion may involve less elasticity and greater stiffness in men than in women since male vessel tissue is generally more rigid than for women. Since female tissue often is more pliable, a female stent design may have a lower modulus of elasticity to expand, may be more elastic, and less rigid. In addition, a male stent design may have differences in drug release than in women. For example, a male stent design may have a greater drug release associated with it, may have specific localized drug release, or a greater concentration of drug released over a shorter period. Additionally, different drug combinations may be associated with a male stent design than for a female stent design. The stent may have multiple layers for providing different drug deliveries for men and women. For example, one layer may be porous or permeable that allows a drug to be released from an inner coating or layer. The porous or permeable coating or layer may have different apertures for men than for women, thereby providing a gender-specific drug delivery. In addition, the coatings or layers may react differently to temperature, pH, or other differences in the intended environment that may be present between men and women. For example, a porous or permeable layer may have an outer coating that dissolves when deployed in a female, thereby allowing the inner coating or layer to be released into the body, but remains substantially intact during exposure in a male body. Alternatively, the outer coating may have a different rate of degradation for men than women, thereby allowing for gender-specific rates of drug delivery. 
         [0097]      FIG. 20  illustrates an embodiment of the invention concerning an arterial stent  180 . Stents are particularly useful in the treatment and repair of blood vessels after a stenosis has been compressed by percutaneous transluminal coronary angioplasty (PTCA), percutaneous transluminal angioplasty (PTA), or removed by atherectomy or other means, to help improve the results of the procedure and reduce the possibility of restenosis. Stents also can be used to provide primary compression to a stenosis in cases in which no initial PTCA or PTA procedure is performed. While stents are most often used in the procedures mentioned above, they also can be implanted on another body lumen such as the carotid arteries, peripheral vessels, urethra, esophagus and bile duct. 
         [0098]    In typical PTCA procedures, a guiding catheter or sheath is percutaneously introduced into the cardiovascular system of a patient through the femoral arteries and advanced through the vasculature until the distal end of the guiding catheter is in the aorta. A guidewire and a dilatation catheter having a balloon on the distal end are introduced through the guiding catheter with the dilatation catheter sliding over the guidewire. The guidewire is first advanced out of the guiding catheter into the patient&#39;s vasculature and is directed across the arterial lesion. The dilatation catheter is subsequently advanced over the previously advanced guidewire until the dilatation balloon is properly positioned across the arterial lesion. Once in position across the lesion, the expandable balloon is inflated to a predetermined size, such as with a radiopaque liquid, at relatively high pressure to displace the atherosclerotic plaque of the lesion against the inside of the artery wall and thereby dilate the lumen of the artery. The balloon is then deflated to a small profile so that the dilatation catheter can be withdrawn from the patient&#39;s vasculature and the blood flow resumed through the dilated artery. As should be appreciated by those skilled in the art, while the above-described procedure is typical, it is not the only method used in angioplasty. 
         [0099]    In angioplasty procedures of the kind referenced above, abrupt reclosure may occur or restenosis of the artery may develop over time, which may require another angioplasty procedure, a surgical bypass operation, or some other method of repairing or strengthening the area. To reduce the likelihood of the occurrence of abrupt reclosure and to strengthen the area, a physician can implant an intravascular prosthesis for maintaining vascular patency, commonly known as a stent, inside the artery across the lesion. Stents are generally cylindrically shaped devices which function to hold open and sometimes expand a segment of a blood vessel or other arterial lumen, such as a coronary artery. Stents are delivered in a radially compressed condition to the target location and then are deployed into an expanded condition to support the vessel and help maintain it in an open position. In one embodiment, the stent may be a self-expanding type formed from, for example, shape memory metals or super-elastic nickel-titanium (NiTi) alloys, which will automatically expand from a compressed state when the stent is advanced out of the distal end of the delivery catheter into the body lumen. 
         [0100]    Physiological differences between the female and male genders may also be found in the cardiovascular systems of men and women. For example, women, on average, have smaller diameter and thinner-walled arteries than men. The invention accounts for these physiological differences by providing different stent designs for men and women. Thus, the invention provides stents  180  that are configured and dimensioned for gender specific use. As noted above, upon insertion into an artery, the stent  180  expands from an initial, compact condition to an expanded condition having a diameter D 1 , wherein the rate of expansion E is dependent on the material properties of the stent  180 . In the expanded condition, the diameter D 1  is of sufficient size to impart an expansive force Fe onto the inner arterial wall. 
         [0101]    In a first embodiment, the stent  180  is designed and configured for use in angioplasty procedures in males. One or more stents  180  may be provided having at least one rate of expansion E and at least one expanded diameter D  1  configured and dimensioned to span the normal size ranges of male human arteries. Additionally, the expansive force Fe imparted onto the inner arterial wall is a function of the arterial wall thickness, such that the expansive force Fe is of sufficient strength to maintain the artery in an open condition preventing reclosure, without damage to the inner arterial wall. Furthermore, additional dimensions of the arteries can be utilized in the design and configuration of the stent  180 . 
         [0102]    In a second embodiment, shown in  FIG. 21 , the stent  182  is designed and configured for use in angioplasty procedures in females. Once again, one or more stents  182  may be provided having at least one rate of expansion E and at least one expanded diameter D 2  configured and dimensioned to span the normal size ranges of female human arteries. Additionally, the expansive force Fe imparted onto the inner arterial wall is a function of the arterial wall thickness, such that the expansive force is of sufficient strength to maintain the artery in an open condition preventing reclosure, without damage to the inner arterial wall. Furthermore, additional dimensions, gender-specific features, or other parameters of the arteries can be utilized in the designed and configuration of the gender specific stent  182 . For instance, the stent  82  also may account for the effect of an illness or medical condition on the strength, size, or thickness of a vessel or vessel wall, which optionally may also be dependent at least in part upon gender. Some of the structural features of the stents that account for gender-specific differences include the following: stent  182  has ends that flare outwardly, while stent  80  is substantially cylindrical; stent  182  has fewer openings than stent  180 ; and the openings in the sidewall of stent  182  are generally larger than the openings in the sidewall of stent  180 . 
         [0103]    As discussed above, coatings can be used to make stent designs genderspecific. It is well known that the stents  180  and  182  can be coated with a pharmaceutical agent  184 . As shown in  FIG. 22 , the pharmaceutical agent  184  can be combined with a coating  186  or other medium used for controlled release rates of the pharmaceutical agent  184 . The pharmaceutical agent  184  can be incorporated into or covered by a monolithic layer or coating, wherein the agent  184  diffuses through the coating  186  and is released into the surrounding fluid. Alternatively, the coating  186  can be a degradable coating, such that as the coating  186  degrades the pharmaceutical agent  184  is released. 
         [0104]    The pharmaceutical agent  184  can be a drug used for the prevention or treatment of restenosis. Formulations useful for restenosis prevention or treatment can include, but are not limited to, heparin and heparin fragments, colchicine, taxol, agiotensin converting enzyme (ACE) inhibitors, angiopeptin, Cyclosporin A, goat-anti-rabbit PDGF antibody, terbinafine, trapidil, interferon-gamma, steroids, ionizing radiation, fusion toxins, antisense oligonucleotides, gene vectors, and rapamycin. 
         [0105]    In addition to or as an alternative to, the pharmaceutical agent  184  may be a therapeutic biologic agent. Examples of such agents include, but are not limited to, hormones, cells, fetal cells, stem cells, bone morphogenic proteins (BMPs), tissue inductive factors, enzymes, proteins, RNA, viruses, etc. 
         [0106]    As previously discussed, men and women may metabolize some medications at different rates and react differently to different types of medications. Just as the size, shape, and other performance characteristics of a stent may be tailored or customized primarily for a particular gender, the pharmaceutical agents used with the stents also may be tailored primarily for a particular gender. Thus, one embodiment of the invention provides a coated stents  180 ,  182  where the coating is formulated differently for different genders. 
         [0107]    It should be noted that customizations of devices or treatments according to the invention may be used individually or in combination with other embodiments described herein or variations thereto. For instance, a single stent construction used for both men and women may have different coatings intended primarily for different genders. In addition, however, different coatings may also be used on different stent constructions that are designed primarily for a particular gender. 
         [0108]    In one embodiment using a pharmaceutical agent  184  coated onto the stent  180 ,  182 , the pharmaceutical agent  184  release rate and dosage are selected to correspond to expected male metabolization and reactions. A coating  186  may also be provided on the stent  180 ,  182  so that the pharmaceutical agent  184  is covered by or incorporated into the coating  186 . The coating  186  may be used to control the timing and release rate of the pharmaceutical agent  184 . For example, the pharmaceutical agent  184  may be released gradually through diffusion through the coating  184  or after at least partial degradation of the coating  186 . In this manner, the coating  186  can be designed and configured to release the pharmaceutical agent  184  at a rate and dosage corresponding to metabolization and potential reactions of primarily either men or women. 
         [0109]    Similarly, the pharmaceutical agent  184  release rate and dosage may be selected to correspond to expected female metabolization and reactions in the same manner. 
         [0110]    While in the foregoing a stent  180 ,  182  was depicted, in other embodiments, similar techniques may be used to coat other types of implantable medical devices, such as hip and knee replacements (total and partial), spinal implants, scaffolds, biological implants or grafts, tissue grafts, screws, plates, rods, prosthetic devices, etc. 
         [0111]    A gender-specific design may also involve altering or controlling the treated area differently for men than for women. Referring to  FIG. 23  a medical implant in the form of a prosthetic knee joint  190 , including a femoral and tibial component  192  and  194 , is provided. The femoral component  192  is configured to provide a localized environmental change in a body of a patient. A localized increase in temperature can have beneficial effects, which include (but are not limited to): aiding in the alleviation of localized pain, fighting of local infections, and increasing vascular flow and permeability of vessels at the treatment site to control delivery of pharmaceutical agent. For example, a localized increasing in temperature increases the permeability of the local tissue, allowing for an increased and more efficient absorption of the pharmaceutical agent into the treatment site. 
         [0112]    The femoral component  192  includes an energy sink  196 , wherein the energy sink  196  can be used to control the localized temperature of the surrounding tissue. For example, the energy sink  196  can be a heat sink, wherein the heat sink  196  is charged by an internal or external energy unit  198 . The heat sink  196  produces a local increase in temperature. 
         [0113]    The male and female genders react differently to localized changes in temperatures. For example, a localized increase in temperature of B degrees may have beneficial effect on a female, but no effect on a male. As a result of the differing effects on the male and the female genders, the applied energy is gender dependent. For example, in a female X amount of energy may be required to heat the heat sink  196  to sufficiently raise the localize temperature to have a beneficial effect. In contrast, in a male, Y amount of energy may be required to heat the heat sink  196  to sufficiently raise the localize temperature to have a beneficial effect, wherein Y is greater than X. In accordance with the present invention, the applied energy and heat sink of a femoral component  192  are designed and configured for gender specific use, taking into account the reactive differences between the female and male genders. 
         [0114]    Similarly, a localized change in pH can have similar beneficial effects, which include (but are not limited to): aiding in the alleviation of localized pain, fighting of local infections, and increasing vascular flow and permeability of vessels at the treatment site to control delivery of pharmaceutical agent. For example, a localized increase in pH may increase the permeability of the local tissue, thereby allowing for an increased and more efficient absorption of the pharmaceutical agent into the treatment site. 
         [0115]    The energy sink  196  in the femoral component  192  can be a pH sink  196 . The pH sink  196  can be incorporated into the femoral component  192  or be positioned separate from the femoral component  192 . Therefore, the pH sink  196  may be configured to release a chemical to produce either an increase or decrease in the local pH in order to provide a more gender-specific use. An acidic agent would lower the pH and a basic agent would raise the pH. Such agents are well-known to those of ordinary skill. 
         [0116]    The male and female genders react differently to localized changes in pH. For example, a localized increase or decrease in the acidity of the surrounding tissue may have a beneficial effect on a female, but no effect on a male. As a result of the different effects on the male and 
         [0117]    the female genders, the chemical and release rate thereof is dependent on the gender of the patient. As such, in accordance with the present invention, the pH sink  196  is designed and configured for gender specific use, taking into account the reactive differences between the female and male genders. 
         [0118]    Additionally, temperature or pH changes may also be used to induce the release of beneficial enzymes, proteins, hormones, etc. from the cells in the treatment site. For example, a localized increase in acidity and/or temperature can be perceived as a physical damage or an infection to the local area. In response, the local cells may release beneficial proteins, enzymes, hormones, etc. 
         [0119]    There are several ways to define how a treatment or device may qualify as being gender specific. One way a treatment or device may be considered gender specific is to identify differences in product design or treatment between men and women. Another way to identify whether a device or treatment is gender specific is to determine who the intended patients are. For instance, a product line having two or more models where at least one model is marketed or designed more for men than women and another model is marketed or designed more for women than men would be gender-specific, and therefore within the scope of the invention. If there are measurable differences between the product design or treatment for men versus women, then another way to identify a product or treatment as gender-specific would be by having these differences meet or exceed a threshold amount. For example, in cases where two or more 
         [0120]    models are offered to account for gender differences at least one of the varying design parameters will differ by about 5 percent or more, and more preferably will differ by about 10 percent or more. 
         [0121]    Thus, differences in a range of sizes of a device may in some cases be by 5 percent or more or by 10 percent or more. Likewise, other measurable differences, such as quantity, concentration, or release rates of medications may differ by these numerical amounts. Of course, skilled artisans would readily appreciate that these differences may be applied to any other measurable design parameter of a device or treatment, including duration, amount, thickness, forces applied, diameter, width, height, volume, density, temperature, pH changes, or the like. 
         [0122]    Furthermore, while one exemplary embodiment of a medical implant discussed above refers to a prosthetic knee joint, it is contemplated that the medical implant can be any prosthetic implant for use in a body, including, ankle, knee, hip, spine, neck, wrist, elbow or shoulder implants. Furthermore, the medical implant can be, but is not limited to, tissue, scaffold, biological implants, graft, tissue graft, screws, plate, rods, or similar devices. 
         [0123]    Pharmaceutical delivery of medication may also be provided in a gender-specific manner. The release and absorption rates of drugs are different for men and women. Oral medication, for instance, may be absorbed differently due to resorption rates in the stomach, intestine, duodenum, abdomen, or the like. Likewise, intravenous medications can react differently for men and women. The present invention contemplates an improved drug delivery that accounts for gender-specific differences. One such example of an improved, gender-specific drug delivery system is in chemotherapy, which is known for being a thermal gradient drug delivery. Since men and women have different temperatures, diurnal changes, and pH, drug-delivery systems would benefit from accounting for one or more of these differences. For example, dosages and the route of administration (e.g. oral release or intravenous) may be varied for men and women. The initial dosage for men may differ from the initial dosage for women, the amount of drugs used in subsequent doses may differ, and the time period between subsequent doses also may differ between men and women. Thus, a medicine given to a man may involve a second dose 8 hours later, while for women the second dose may be 6 hours later, or based on diurnal curves of men and women. 
         [0124]    As noted previously, one consequence of accounting for gender-specific difference in medical treatment is that medical treatment may become more complicated or difficult. This additional complexity, however, can be reduced by providing gender-specific indictors on the devices, packaging, or instructions. 
         [0125]    The system includes gender specific packaging material which differentiates use for male and female patients. The packaging material can include labeling or color coding to specify gender usage. For medications, the packaging material can include labeling, inserts, or product information which provides dosage information for both male and female patients. 
         [0126]    Referring now to  FIG. 24 , a product packaging material  200  of the present invention is shown. The packaging material  200  includes a label  202  affixed thereto or, in the alternative, incorporated into the packaging material  200 . The label  202 , illustrated in  FIG. 25 , provides information identifying the contents and usage of the packaging material  200 , which can include a gender specifier  204 . The gender specifier  204  identifies the gender that the contents of the packaging material  200  are intended for. For example, the gender specifier  204  can be in pictorial, graphic, or text (or combination) form such as “FEMALE” or “MALE.” It is contemplated that the text form of the gender specifier  204  can be provided in a variety of languages, depending of the intended country of use. 
         [0127]    Alternatively, the gender specifier  204  can be in the form of a color coding, wherein a first color is used to indicate a female gender and a second color is used to indicate a male gender. The first and second colors may be selected from colors that are recognizable as gender indicators. For example, to indicate a female gender the first color can be pink while blue may be used to indicate a male gender. However, it is contemplated that first and second colors can be any colors which are readably discernable as indicators of gender. The color coded gender specifier  204  is depicted as incorporating only a portion of the label  202 . However, it is contemplated that the entire label  202  can be color coded to specify gender. 
         [0128]    In a further embodiment, the gender specifier  204  can be a symbolic form for representing female and male genders. For example, the gender specifier  204  can be the western culture ideograms for female and male genders, namely “♀” for the female gender and “♂” for the male gender. However, it is contemplated that gender symbols can be any symbols which are readably discernable as indicators of gender. 
         [0129]    The label  202  can include additional information, including, the product name  206  and product technical information  208 . The product name  206  can be a name used by the company for the product, used to identify the origin of the product, such as CHARITE owned by DePuy Spine, Inc., for an artificial disc. Alternatively, the product name can be a generic or descriptive name of the product, such as ARTIFICIAL DISC. Additional technical information  208  can be provided, such as information relating to the size, material, date of manufacture, lot or control number, etc. 
         [0130]    In an alternative embodiment, the packaging material  200  is the gender specifier. For example, the packaging material  200  can be color coded to indicate gender, wherein a first color is used to indicate a female gender and a second color is used to indicate a male gender. The first and second color are selected from colors that are recognizable a gender indicators. For example, to indicate a female gender the first color can be the color pink and to indicate a male gender the second color can be the color blue. However, it is contemplated that first and second colors can be any colors which are readily discernable and indicators of gender. 
         [0131]    Referring to  FIG. 26 , an exemplary medicine container  210  is provided, wherein the medicine container  210  includes a label  212  affixed thereto. The label  212  provides information identifying the contents  214  and usage of the enclosed medicine. The usage information includes the recommend dosage for each gender, wherein gender specifiers  216  and  218  annotate the gender dosage information  220  and  222 . As described above, the gender specifiers  216  and  218  can be in a text form, such as “FEMALE” and “MALE.” Alternatively, the gender specifiers  216  and  218  can be in the form of a color coding or in symbolic representations. 
         [0132]    In an alternative embodiment, a product insert can be provided in the medicine container  210 . Similar to the label  212 , the product insert can provide information identifying the contents and usage of the enclosed medicine, which can include gender specifiers used in conjunction with dosage information. 
         [0133]    Another technology that may be utilized to provide a gender-specific indicator is RFID chips. RFID chips may be associated with equipment, instruments, or in sterile packaging so that identification of the intended gender for the devices may be quickly determined. This may be of particular benefit where it is difficult to visually determine the gender-specific design. For example, it may be difficult to visually confirm the intended gender of light sensitive 
         [0134]    therapeutics, internal components, sealed materials, or implanted devices. Likewise, instrumentation kits may involve several tools or devices that would be time-consuming to confirm are all intended for the same gender. By associating an RFID tag with these devices, however, the gender-specific information can be quickly retrieved. In one embodiment, RFID chips provided in packaged gender-specific drugs are used to determine remaining quantities of medicine. 
         [0135]    All references cited herein are expressly incorporated by reference in their entirety. 
         [0136]    It will be appreciated by persons skilled in the art that the present invention is not limited to what has been particularly shown and described herein above. In addition, unless mention was made above to the contrary, it should be noted that all of the accompanying drawings are not to scale. A variety of modifications and variations are possible in light of the above teachings without departing from the scope and spirit of the invention.