Patent Description:
Many bones of the human musculoskeletal system include articular surfaces. The articular surfaces articulate relative to other bones to facilitate different types and degrees of joint movement. The articular surfaces can erode or experience bone loss over time due to repeated use or wear or can fracture as a result of a traumatic impact. These types of bone defects can cause joint instability and pain.

Bone deficiencies may occur along the articular surfaces of the glenoid bone. Some techniques utilize a bone graft and/or implant to fill a defect in the glenoid bone. The implant may be secured to the glenoid utilizing one or more fasteners.

<CIT> discloses a glenoid implant. <CIT> discloses reverse shoulder systems.

This disclosure relates to orthopaedic implants that may be used during methods for repairing bone defects. The implants described herein may be utilized to restore functionality to a joint and include peripheral apertures arranged in one or more patterns for receiving fasteners to secure the implants at a surgical site.

An orthopaedic implant according to the invention is defined in claim <NUM>.

A kit for arthroplasty according to the invention is defined in claim <NUM>.

A method of installing an orthopaedic implant at a surgical site may include selecting a baseplate from a set of baseplates based on a surface profile of a surgical site. Each baseplate of the set of baseplates may include a plate body having a main body portion and a substantially wedge-shaped augment portion that cooperate to establish a front face and a rear face of the plate body, and a plurality of peripheral apertures may extend between the front and rear faces. A first reference plane may extend along the longitudinal axis to bisect the augment portion. The set of baseplates may include a first baseplate and a second baseplate, the peripheral apertures of the first baseplate may be arranged to establish a first pattern such that one or more of the peripheral apertures extend along the first reference plane, and the peripheral apertures of the second baseplate may be arranged to establish a second pattern circumferentially offset from the first pattern relative to the longitudinal axis, and the first and second patterns may have a common circumferential spacing between the respective peripheral apertures. The method may include positioning the selected baseplate relative to the surface profile of the surgical site and may include positioning a fastener in a respective one of the peripheral apertures to secure the selected baseplate to the surgical site.

This disclosure relates to orthopaedic implants and methods for repairing bone defects. The implants described herein may be utilized during arthroplasty procedures and incorporated into a shoulder prosthesis for restoring functionality to shoulders having advanced cartilage disease. The disclosed implants may be utilized to address complex glenoid pathology, which may have bony deficiencies at many different orientations relative to the Superior/Inferior (S/I) plane of the glenoid face. The implants can include augment geometries configured to fill bone voids along the glenoid face. The disclosed implants may include peripheral apertures arranged in patterns. The disclosed patterns can be utilized to improve fixation of the respective implant at the surgical site, which can lead to improved healing.

<FIG> illustrate an exemplary orthopedic implant <NUM>. The implant <NUM> can be utilized for various surgical procedures, such as arthroplasty procedures to repair a joint. For example, the implant <NUM> can be incorporated into a shoulder prosthesis. Although the implants disclosed herein primarily refer to repair of a defect in a glenoid during a shoulder reconstruction, such as a reverse shoulder procedure, it should be understood that the disclosed implants may be utilized in other locations of the patient and other surgical procedures.

Referring to <FIG>, the implant <NUM> includes a baseplate <NUM> and a glenosphere <NUM> releasably secured to the baseplate <NUM>. The baseplate <NUM> includes a plate body <NUM> extending along a longitudinal axis A (<FIG>) between a front (or first) face <NUM> (<FIG>) and a rear (or second) face <NUM> generally opposed to the front face <NUM>. The rear face <NUM> may generally correspond to a medial side of a patient, and the front face <NUM> may generally correspond to a lateral side of the patient when implanted in a surgical site, for example.

The baseplate <NUM> can include a post or anchoring stem <NUM> extending outwardly from the rear face <NUM>. A central axis of the anchoring stem <NUM> may be offset from the longitudinal axis A. In <FIG>, the anchoring stem <NUM> extends along the longitudinal axis A and has a substantially cylindrically geometry. The anchoring stem <NUM> may be dimensioned for insertion in a glenoid or bone hole which may be formed to secure the baseplate <NUM>, for example.

The anchoring stem <NUM> can include a first stem portion <NUM> and a second stem portion <NUM>. The first stem portion <NUM> can be integrally formed with the plate body <NUM>. The anchoring stem <NUM> and plate body <NUM> may be separate and distinct components. The first stem portion <NUM> can be mechanically attached or otherwise secured to the second stem portion <NUM> utilizing various techniques, such as threading, bonding and welding. In <FIG>, the first stem portion <NUM> and second stem portion <NUM> are connected via a reversed taper connection. The anchoring stem <NUM> may be a single component.

Referring to <FIG>, with continuing reference to <FIG>, the plate body <NUM> includes a main body portion <NUM> and an augment portion <NUM> extending outwardly from the main body portion <NUM>. The main body portion <NUM> may establish a perimeter <NUM> of the plate body <NUM>. The perimeter <NUM> of the plate body <NUM> can have an elliptical geometry, for example. In <FIG>, the perimeter <NUM> of the plate body <NUM> has a substantially circular geometry. A substantially circular geometry may reduce a reaming width and complexity of preparing a surgical site to accept the implant <NUM>. The main body portion <NUM> establishes a front face <NUM> of the plate body <NUM>. The augment portion <NUM> establishes at least a portion of the rear face <NUM>.

Various materials can be utilized to form the baseplate <NUM> and glenosphere <NUM>. The baseplate <NUM> and glenosphere <NUM> may be made of metallic materials. The implant <NUM> can include one or more coatings or layers <NUM> deposited along surfaces of the baseplate <NUM>. Example coatings <NUM> can include calcium phosphate (CaP) having a porous construction for promoting bone growth.

The augment portion <NUM> can be dimensioned to approximate various defect geometries and surface contours that may be encountered along a surgical site. The augment portion <NUM> may be configured to at least partially fill a bone void in a glenoid. The augment portion <NUM> can be dimensioned to establish a relative lesser or greater overall volume of the baseplate <NUM>. For example, a cross section of the augment portion <NUM> can have a substantially wedge-shaped geometry and may extend across a full width of the main body portion <NUM> (e.g., "full-wedge"), as illustrated by <FIG> and <FIG>. The augment portion <NUM> can have other shaped or profiles, such as a generally step-shaped geometry.

The augment portion <NUM> extends outwardly from the main body portion <NUM> to establish an augment face section <NUM> of the rear face <NUM>. The augment face section <NUM> can be substantially planar. The augment face section <NUM> can be generally concave or convex. The augment face section <NUM> can substantially slope or extend across the full width of the main body portion <NUM>, with the augment face section <NUM> arranged transversely relative to the longitudinal axis A, as illustrated in <FIG> and <FIG>. The augment portion <NUM> can be dimensioned such that innermost (e.g., lowest) and outermost (e.g., highest) points of the augment face section <NUM> relative to the longitudinal axis A are defined along a perimeter of the augment portion <NUM>.

The augment face section <NUM> can be arranged at various angles relative to the main body portion <NUM> to establish a relative lesser or greater overall volume of the baseplate <NUM>. The augment face section <NUM> may establish an acute angle α relative to a reference plane that is perpendicular to the longitudinal axis A, as illustrated by <FIG>. The angle α may be greater than <NUM> degrees but may be less than <NUM> degrees. The angle α can be equal to or greater than approximately <NUM> degrees and less than or equal to approximately <NUM> degrees, for example. The angle α may be approximately <NUM> or <NUM> degrees. For the purposes of this disclosure, the term "approximately" means ±<NUM> percent of the stated value unless otherwise disclosed.

The baseplate <NUM> may include a plurality of peripheral apertures (or holes) <NUM> along the front face <NUM> of the plate body <NUM>. The peripheral apertures <NUM> may extend between the front face <NUM> and rear face <NUM> of the plate body <NUM>, with at least some or each of the peripheral apertures <NUM> extending through a thickness of the augment portion <NUM> between the front face <NUM> and the augment face section <NUM> of the rear face <NUM>, as illustrated in <FIG>. Each peripheral aperture <NUM> can be dimensioned to receive a respective peripheral fastener PF (shown in dashed lines in <FIG> for illustrative purposes) for securing the baseplate <NUM> to a surgical site. Example fasteners may include compression screws, as illustrated by the peripheral fasteners PF of <FIG>.

The baseplate <NUM> can include one or more recesses <NUM> extending inwardly from the front face <NUM> of the plate body <NUM>. The recesses <NUM> can be dimensioned to receive an inserter or tooling T to insert or otherwise position the baseplate <NUM> along a surgical site (shown in dashed lines in <FIG> for illustrative purposes). The recesses <NUM> may be omitted.

The glenosphere <NUM> includes an articulating surface <NUM> which may have a generally convex geometry, as illustrated by <FIG> and <FIG>. The articulating surface <NUM> may cooperate with a humeral component having a generally concave, complementary geometry. The front face <NUM> can have a generally concave geometry, as illustrated in <FIG>. The glenosphere <NUM> may be omitted and the front face <NUM> may serve as an articulating surface that cooperates with a humeral component having a generally convex, complementary geometry.

The glenosphere <NUM> can be mechanically attached or releasably secured to the baseplate <NUM> adjacent to the front face <NUM>, as illustrated by <FIG> and <FIG>. In <FIG>, the glenosphere <NUM> may include a recess <NUM> dimensioned to at least partially receive the main body portion <NUM> of the baseplate <NUM> adjacent to the front face <NUM>. The recess <NUM> may be dimensioned to encircle a rim of the baseplate <NUM> along the front face <NUM>. A perimeter of the main body portion <NUM> of the baseplate <NUM> can be dimensioned to cooperate with a perimeter of the recess <NUM> to establish a Morse taper connection to secure the glenosphere <NUM> to the baseplate <NUM>. The plate body <NUM> can include a central aperture <NUM> extending along the longitudinal axis A. The glenosphere <NUM> can include an aperture <NUM> dimensioned to receive a fastener F (shown in dashed lines in <FIG> for illustrative purposes). The fastener F can include threading that cooperates with threading along the central aperture <NUM>. The fastener F can serve to align the glenosphere <NUM> relative to the longitudinal axis A and/or secure the glenosphere <NUM> to the baseplate <NUM>. The fastener F and/or apertures <NUM>, <NUM> and may be omitted. The anchoring stem <NUM> may be omitted and the aperture <NUM> may be dimensioned to receive a fastener such as a compression screw for securing the baseplate <NUM> to a surgical site (illustrated by fastener F' of <FIG> in dashed lines in for illustrative purposes).

Referring to <FIG>, with continuing reference to <FIG>, the peripheral apertures <NUM> can be circumferentially distributed about the longitudinal axis A to establish a respective pattern (or layout) <NUM>. Each pattern <NUM> can be predefined with respect to a geometry of the baseplate <NUM> and augment portion <NUM>. A perimeter of the augment portion <NUM> is shown in dashed lines for illustrative purposes. The pattern <NUM> can be defined with respect to the front face <NUM> of the plate body <NUM>. The peripheral apertures <NUM> may be arranged relative to first and second reference planes R1, R2 to establish the pattern <NUM>. The first and second reference planes R1, R2 may be arranged perpendicular to each other and can extend along the longitudinal axis A such that the first reference plane R1 may bisect the augment face section <NUM> of the augment portion <NUM>. The augment portion <NUM> can be dimensioned such that the innermost (e.g., lowest) and outermost (e.g., highest) points of the augment face section <NUM> relative to the longitudinal axis A are defined along the first reference plane R1.

<FIG> illustrates a perspective view of the baseplate <NUM> relative to the reference plane R1. <FIG> illustrates a sectional view of the baseplate <NUM> taken along the first reference plane R1 and through a maximum thickness of the augment portion <NUM>. <FIG> illustrates a sectional view of the baseplate <NUM> taken along the second reference plane R2. The first and second reference planes R1, R2 may divide the baseplate <NUM> into four quadrants I-VI. The baseplate <NUM> may be symmetrical on opposed sides of the first reference plane R1. The baseplate <NUM> may be asymmetrical on opposed sides of the first reference plane R1.

The pattern <NUM> may be defined such that one or more of the peripheral apertures <NUM> extend along the first reference plane R1. In <FIG>, the pattern <NUM> may be established by a total of four peripheral apertures <NUM>. The four peripheral apertures <NUM> can be spaced at approximately <NUM> degree increments about the longitudinal axis A such that the apertures <NUM> are substantially equally distributed about the longitudinal axis A. Two of the peripheral apertures <NUM> may extend along and be aligned with the first reference plane R1 (indicated at <NUM>-<NUM>, <NUM>-<NUM>), and another two of the peripheral apertures <NUM> may extend along and be aligned with the second reference plane R2 (indicated at <NUM>-<NUM>, <NUM>-<NUM>). The pattern <NUM> may be defined such that the baseplate <NUM> is free of any peripheral apertures between adjacent pairs of the peripheral apertures <NUM>.

Other example patterns can be utilized with any of the baseplates disclosed herein, and fewer or more than four peripheral apertures can be utilized. One or more of the peripheral apertures <NUM>-<NUM> to <NUM>-<NUM> can be omitted. For example, apertures <NUM>-<NUM>, <NUM>-<NUM> can be omitted such that the pattern <NUM> is established by the pair of opposed apertures <NUM>-<NUM>, <NUM>-<NUM>, or vice versa. In <FIG>, pattern <NUM>' includes a total of three peripheral apertures <NUM>' (indicated at <NUM>-<NUM>'/<NUM>-<NUM>', <NUM>-<NUM>' and <NUM>-<NUM>'). Aperture <NUM>-<NUM>'/<NUM>-<NUM>' may extend along the first reference plane R1'. Apertures <NUM>-<NUM>', <NUM>'<NUM> may be circumferentially offset or otherwise spaced apart from both the first reference plane R1' and second reference plane R2'.

Referring to <FIG>, with continuing reference to <FIG>, each peripheral aperture <NUM> may extend along a respective passage axis PA. The passage axis PA can be parallel to the longitudinal axis A. In <FIG>, the passage axis PA is substantially transverse to the longitudinal axis A, which can increase a spacing between terminal ends of adjacent fasteners inserted through the peripheral apertures <NUM>. At least some of the peripheral apertures <NUM> can intersect a respective notch <NUM> along the perimeter <NUM> of the plate body <NUM>.

Various patterns or layouts of peripheral apertures can be established to approximate a variety of different surface profiles and void geometries that may be encountered by the surgeon in preparation of surgery. The surgeon can be provided with a set of orthopedic implants in a kit for arthroplasty, including any of the implants and patterns disclosed herein. The kit can include a set of baseplates having any of the baseplates, augment geometries and patterns of the peripheral apertures disclosed herein. The kit can also include fasteners that are received in respective peripheral apertures to secure the respective baseplate to the surgical site.

<FIG> illustrate an exemplary orthopedic implant <NUM> according to the invention as defined in claim <NUM>. Referring to <FIG>, the implant <NUM> includes a baseplate <NUM> having a plate body <NUM> extending along a longitudinal axis A between a front (or first) face <NUM> and a rear (or second) face <NUM> generally opposed to the front face <NUM>. The baseplate <NUM> includes a central post or anchoring stem <NUM> which may extend outwardly from the rear face <NUM> along a longitudinal axis A. The plate body <NUM> includes a main body portion <NUM> and an augment portion <NUM> may extend outwardly from the main body portion <NUM>. The main body portion <NUM> establishes a front face <NUM> of the plate body <NUM>. The augment portion <NUM> establishes at least a portion of the rear face <NUM> and has a substantially wedge-shaped geometry.

The baseplate <NUM> includes a plurality of peripheral apertures (or holes) <NUM> along the front face <NUM> of the plate body <NUM> for securing the baseplate <NUM> to a surgical site. The peripheral apertures <NUM> extend between the front face <NUM> and rear face <NUM>, with at least some or each of the peripheral apertures <NUM> extending through a thickness of the augment portion <NUM> between the front face <NUM> and an augment face section <NUM> of the rear face <NUM>, as illustrated in <FIG>. Each peripheral aperture <NUM> is dimensioned to receive a respective fastener for securing the baseplate <NUM> to a surgical site.

Referring to <FIG>, with continuing reference to <FIG>, the peripheral apertures <NUM> are circumferentially distributed about the longitudinal axis A to establish a respective pattern (or layout) <NUM>. The peripheral apertures <NUM> are arranged relative to first and second reference planes R1, R2 such that the pattern <NUM> differs from the pattern <NUM> of peripheral apertures <NUM> (<FIG>). The first reference plane R1 bisects an augment face section <NUM> of augment portion <NUM> (shown in dashed lines for illustrated purposes). All of the peripheral apertures <NUM> are circumferentially offset (e.g., "obliquely" arranged) or are otherwise spaced apart from both of the first and second reference planes R1, R2 with respect to the longitudinal axis A. In <FIG>, all peripheral apertures <NUM> of the baseplate <NUM> that are arranged about the longitudinal axis A are circumferentially offset from both of the first and second reference planes R1, R2 with respect to the longitudinal axis A.

Various quantities of peripheral apertures <NUM> can be utilized to establish the pattern <NUM>. In <FIG>, the baseplate <NUM> may include a total of four peripheral apertures <NUM> (indicated at <NUM>-<NUM> to <NUM>-<NUM>). However, it should be appreciated that fewer or more than four peripheral apertures <NUM> can be utilized in accordance with the teachings disclosed herein. The peripheral apertures <NUM> are substantially uniformly distributed about the longitudinal axis A. The peripheral apertures <NUM> may be non-uniformly distributed about the longitudinal axis A such that some adjacent pairs of apertures <NUM> are relatively closer or further away than other adjacent pairs of apertures <NUM>.

The baseplates <NUM>, <NUM> can be provided as a set of baseplates (e.g., first and second baseplates), with each baseplate <NUM>, <NUM> establishing a respective pattern <NUM>, <NUM> (e.g., first and second patterns). The peripheral apertures <NUM> of the pattern <NUM> and the peripheral apertures <NUM> of the pattern <NUM> can have a common number of peripheral apertures <NUM>/<NUM> and can have a common circumferential spacing between respective adjacent apertures <NUM>/<NUM> relative to the longitudinal axis A. The baseplate <NUM> can have the same external profile or shape as the baseplate <NUM>.

The peripheral apertures <NUM> can be arranged such that the pattern <NUM> is circumferentially offset from the pattern <NUM> (<FIG>) relative to the longitudinal axis A. For example, the baseplate <NUM> can be free of any peripheral apertures <NUM> along the first reference plane R1 as illustrated by <FIG> illustrate a sectional view of the baseplate <NUM> taken along the first reference plane R1 and through a maximum thickness of the augment portion <NUM>. The peripheral apertures <NUM>, <NUM> of both patterns <NUM>, <NUM> can be substantially equally distributed about the longitudinal axis A.

In <FIG>, a third reference plane R3 may extend along the longitudinal axis A such that the first and third reference planes R1, R3 establish an acute angle β. A fourth reference plane R4 may extend along the longitudinal axis A such that the second and fourth reference planes R2, R4 establish an acute angle φ. The third reference plane R3 may be perpendicular to the fourth reference plane R4. One or more of the apertures <NUM> may be circumferentially arranged along the third reference plane R3, and one or more of the apertures <NUM> may be circumferentially arranged along the fourth reference plane R4. An opposed pair of the apertures <NUM>-<NUM>, <NUM>-<NUM> may be arranged along the third reference plane R3 (see also <FIG>), and another opposed pair of the apertures <NUM>-<NUM>, <NUM>-<NUM> may be arranged along the fourth reference plane R4, as illustrated in <FIG>. The angle β and/or angle φ may be greater than <NUM> degrees, such as between approximately <NUM> degrees and approximately <NUM> degrees, or more narrowly between approximately <NUM> degrees and approximately <NUM> degrees such as approximately <NUM> degrees. The angle β and/or angle φ may be greater than <NUM> degrees but may be less than <NUM> degrees. The angle β and angle φ can be the same or can differ. The angle β and angle φ may be equal, and the pattern <NUM> of apertures <NUM> may be circumferentially offset or shifted from the pattern <NUM> of apertures <NUM> by the angle β relative to the longitudinal axis A.

In the embodiment of <FIG>, pattern <NUM>' may circumferentially offset or shifted from pattern <NUM> (<FIG>) in a counterclockwise direction relative to longitudinal axis A'. The apertures <NUM>' of the pattern <NUM>' can be circumferentially offset to a lesser amount than the apertures <NUM> of the pattern <NUM>. Angle β' and angle φ' may be less than <NUM> degrees, such as about <NUM> degrees. In <FIG>, pattern <NUM>'' may be circumferentially offset or shifted from pattern <NUM> in a clockwise direction relative to longitudinal axis A". Angle β" and angle φ" may be less than <NUM> degrees, such as about <NUM> degrees. The disclosed values of angle β and/or angle φ can be positive (e.g., clockwise) or negative (e.g., counterclockwise) relative to the respective reference planes R1, R2.

Fewer or more than four circumferentially offset peripheral apertures can be utilized. One or more of the peripheral apertures <NUM>-<NUM> to <NUM>-<NUM> can be omitted. For example, apertures <NUM>-<NUM>, <NUM>-<NUM> can be omitted such that the pattern <NUM> may be established by the pair of opposed apertures <NUM>-<NUM>, <NUM>-<NUM>, or vice versa. As another example, apertures <NUM>-<NUM>, <NUM>-<NUM> can be omitted such that the pattern <NUM> is established by apertures <NUM>-<NUM>, <NUM>-<NUM>, or vice versa.

<FIG> illustrate an exemplary orthopedic implant <NUM>. Referring to <FIG>, the implant <NUM> includes a baseplate <NUM> having a plate body <NUM> extending along a longitudinal axis A between a front (or first) face <NUM> and a rear (or second) face <NUM> which may generally opposed to the front face <NUM>. The baseplate <NUM> can include a central post or anchoring stem <NUM> which may extend outwardly from the rear face <NUM> along a longitudinal axis A. The plate body <NUM> includes a main body portion <NUM> and an augment portion <NUM> which may extend outwardly from the main body portion <NUM>. The main body portion <NUM> can establish a front face <NUM> of the plate body <NUM>. The augment portion <NUM> can establish at least a portion of the rear face <NUM> and can have a substantially wedge-shaped geometry.

The augment portion <NUM> may be dimensioned to extend less than a full width of the main body portion <NUM> (e.g., "partial-wedge"). The rear face <NUM> may include an augment face section <NUM> established by the augment portion <NUM> and a second face section <NUM> joined at an interface <NUM>. The second face section <NUM> can be arranged along a reference plane that may be substantially perpendicular to the longitudinal axis A, as illustrated by <FIG> illustrates a sectional view through a maximum thickness of the augment portion <NUM>. The augment portion <NUM> can be dimensioned to span approximately <NUM>/<NUM> of a width of the plate body <NUM>, with the interface <NUM> established along the longitudinal axis A (e.g., "half-wedge"), as illustrated by <FIG>. The augment portion <NUM> can be dimensioned to extend less than or greater than <NUM>/<NUM> of the width of the plate body <NUM>, such as approximately <NUM>/<NUM> of the width of the plate body <NUM> (e.g., "<NUM>/<NUM> wedge").

The augment face section <NUM> may establish an acute angle α relative to a reference plane that may be perpendicular to the longitudinal axis A, as illustrated in <FIG>. The angle α can be equal to or greater than approximately <NUM> degrees and more narrowly less than or equal to approximately <NUM> degrees, for example. The angle α may be approximately <NUM>, <NUM> or <NUM> degrees. The geometry of the augment portion <NUM> can be utilized with any of the baseplates and/or patterns of peripheral apertures disclosed herein.

The baseplate <NUM> may include a plurality of peripheral apertures (or holes) <NUM> along the front face <NUM> of the plate body <NUM> for securing the baseplate <NUM> to a surgical site, as illustrated in <FIG>. The peripheral apertures <NUM> can extend between the front face <NUM> and rear face <NUM> of the plate body <NUM>, with at least some or each of the peripheral apertures <NUM> extending through a thickness of the augment portion <NUM> between the front face <NUM> and an augment face section <NUM> of the rear face <NUM>, as illustrated in <FIG>. In <FIG>, only some of the peripheral apertures <NUM> may extend through the augment portion <NUM>, and at least one of the apertures <NUM> may extend between the front face <NUM> and the second face section <NUM> of the rear face <NUM>. Each peripheral aperture <NUM> may be dimensioned to receive a respective fastener for securing the baseplate <NUM> to a surgical site.

Referring to <FIG>, with continuing reference to <FIG>, the peripheral apertures <NUM> can be circumferentially distributed about the longitudinal axis A to establish a respective pattern (or layout) <NUM>. The pattern <NUM> can be arranged according to any of the patterns disclosed herein. The pattern <NUM> may correspond to the pattern <NUM> of <FIG>, with <FIG> being a sectional view taken along the third or fourth reference planes R3, R4, and <FIG> being a sectional view of the baseplate <NUM> of taken along the first reference plane R1.

<FIG> illustrates an exemplary pattern (or layout) <NUM>. Baseplate <NUM> includes an augment portion <NUM> (shown in dashed lines) that may extend less than a full width of the plate body <NUM>. Peripheral apertures <NUM> (indicated at <NUM>-<NUM> to <NUM>-<NUM>) may be circumferentially distributed about longitudinal axis A to establish the pattern <NUM>. Each aperture <NUM> may be circumferentially offset from an adjacent reference plane R1, R2 to establish a respective angle β (indicated at β-<NUM> to β-<NUM>). The angles β-<NUM> to β-<NUM> can differ such that the apertures <NUM> are non-uniformly distributed about the longitudinal axis A.

Other baseplate shapes or profiles can be utilized. In <FIG>, a perimeter <NUM>' of baseplate <NUM>' may have an elliptical, non-circular geometry established by points P1', P2' along a major axis and points P3', P4' along a minor axis of the ellipse. The major and minor axes can be aligned with first and second reference planes R1', R2', for example. In <FIG>, a perimeter <NUM>" of baseplate <NUM>" may have an ovoid-shaped geometry established by points P1', P2' along a major axis and points P3', P4' along a minor axis of the ovoid. The major and minor axes can be aligned with first and second reference planes R1", R2'', for example.

<FIG> illustrates an exemplary method of installing an orthopaedic implant at a surgical site in a flowchart <NUM>. The method may be utilized to perform an arthroplasty for restoring functionality to shoulders having advanced cartilage disease, such as repairing bone defects along a glenoid, for example. The method <NUM> can be utilized with any of the orthopedic implants, augment geometries and patterns of peripheral apertures disclosed herein. Fewer or additional steps than are recited below could be performed within the scope of this disclosure, and the recited order of steps is not intended to limit this disclosure.

A kit for arthroplasty can be provided at block <NUM>. The kit can include any of the components disclosed herein including a set of baseplates, a plurality of peripheral fasteners, and one or more glenospheres. At step <NUM>, a baseplate may be selected from a set of baseplates based on a surface profile of the surgical site. An exemplary surface profile of a surgical site S is illustrated by <FIG>. Another exemplary surface profile of a surgical site S' is illustrated by <FIG>. Other exemplary surface profiles of surgical sites S are disclosed in <FIG> and 25A-25E. The set of baseplates may include at least a first baseplate (e.g., baseplate <NUM>) and a second baseplate (e.g., baseplate <NUM>). Each of the baseplates can include peripheral apertures arranged to establish the respective pattern, including any of the patterns disclosed herein. The peripheral apertures of the second baseplate may be arranged to establish a second pattern (e.g., pattern <NUM>) which may be circumferentially offset from a first pattern (e.g., pattern <NUM>) of the first baseplate relative to longitudinal axis. The first and second pattern can have a common circumferential spacing between the respective peripheral apertures.

Referring to <FIG>, with continuing reference to <FIG>, the surgical site S can be prepared for receiving a prosthesis <NUM> including an implant <NUM> at step <NUM>. The implant <NUM> can include a baseplate <NUM> and glenosphere <NUM>. The implant <NUM> including the baseplate <NUM> may correspond to any of the implants and baseplates disclosed herein. A backside of the baseplate <NUM> can include an augment portion <NUM> which may be dimensioned to abut a surface and/or fill a bone void along the surgical site S. The augment portion <NUM> can have a generally wedge-shaped geometry.

One or more operations can be performed to prepare the surgical site S, such as one or more reaming, milling and drilling operations to establish a desired geometry of the surgical site. Step <NUM> can include forming a recess or bone hole BH at the surgical site S, such as an articulating surface of a glenoid, by removing tissue such as bone B at the surgical site S. A bone hole BH' may be formed to remove tissue from a defect in bone B' as illustrated by <FIG>. The bone hole BH' can be dimensioned to at least partially receive at least an augment portion <NUM>' of baseplate <NUM>'. A defect in the glenoid can be characterized by the Walch Classification. The surgeon can measure bone loss utilizing imaging of the surgical site, such a radiogram or computed tomography technique, or can approximate a profile of the defect utilizing one or more sizers and/or measuring devices placed against the bone surface. The bone hole BH' can be dimensioned to approximate a profile of the defect. A baseplate <NUM>" can be dimensioned such that an augment portion <NUM>'' may extend less than a full width of the baseplate <NUM>" (shown in dashed lines in <FIG> for illustrative purposes).

At step <NUM>, the selected baseplate <NUM> may be positioned relative to the surface profile and bone hole BH of the surgical site S. Step <NUM> can include positioning an anchoring stem <NUM> of the selected baseplate <NUM> in the bone hole BH to secure the baseplate <NUM> at the surgical site S.

At step <NUM>, one or more fasteners may be positioned in a respective one of the peripheral apertures along respective passage axes PA (shown in dashed lines in <FIG> for illustrative purposes) to secure the selected baseplate to the surgical site S, as illustrated by the peripheral fasteners PF and peripheral apertures <NUM>, <NUM> of the baseplates <NUM>, <NUM> of <FIG> and <FIG>. In <FIG> and <FIG>, the peripheral fasteners PF may be compression screws that can serve to apply and maintain compression between the respective baseplate <NUM>, <NUM> and glenoid surface which may reduce relative motion and may reduce tissue formation that may otherwise occur due to spacing between the contact surfaces of the baseplate and glenoid.

At step <NUM>, a head portion or glenosphere <NUM> can be secured to the selected baseplate <NUM> which may provide an articulating surface for mating with an opposed articulating member M. The articulating member M can be an implant secured to a humerus, for example. The baseplate <NUM> may provide the articulating surface.

<FIG> illustrate the implant <NUM> situated relative to a surgical site S at different view angles. <FIG> illustrate the implant <NUM> situated relative to a surgical site S at different view angles. <FIG> can correspond to the same view angles of <FIG>, respectively. The geometry of the surgical sites S of <FIG> and <FIG> may be the same or may differ. The implants <NUM>, <NUM> of <FIG> and <FIG> can be installed relative to the respective surgical site S utilizing the method <NUM> of <FIG>, for example.

Each peripheral aperture <NUM>, <NUM> may be dimensioned to receive a respective peripheral fastener PF to secure the plate body <NUM>, <NUM> to the surgical site S. The peripheral fasteners PF may extend at least partially through a thickness of the bone tissue at the surgical site S.

In <FIG>, the baseplate <NUM> can be arranged such that the first and second reference planes R1, R2 may be substantially aligned with the Superior/Inferior (S/I) and/or Anterior/Posterior (A/P) planes of the patient. One or more of the peripheral apertures <NUM> and peripheral fasteners PF may be positioned along the S/I plane and/or A/P plane.

In <FIG>, the first reference plane R1 of the baseplate <NUM> may be arranged such that the first and second reference planes R1, R2 may be substantially aligned with the S/I and A/P planes. All of the peripheral apertures <NUM> can be circumferentially offset from the first reference plane R1, second reference plane R2, S/I plane, and/or A/P plane.

<FIG> illustrate an exemplary orthopaedic implant <NUM>. The implant <NUM> includes a baseplate <NUM> which may include a plate body <NUM> and an augment portion <NUM> positioned relative to a main body portion <NUM>. The main body portion <NUM> and augment portion <NUM> may be separate and distinct components. The baseplate <NUM> may include a plurality of peripheral apertures <NUM> that may establish a pattern or layout <NUM>. The apertures <NUM> can be arranged according to any of the patterns disclosed herein.

The augment portion <NUM> may include one or more channels <NUM> extending along a respective path <NUM>. The channels <NUM> may be elongated slots and may be generally arcuate-shaped, as illustrated by <FIG>. A passage axis PA of a respective aperture <NUM> can be substantially aligned with the path <NUM> of a respective channel <NUM>. A first reference plane R1 may bisect the augment portion <NUM>, and a second reference plane R2 may be perpendicular to the first reference plane R2. The baseplate <NUM> can include a lock mechanism <NUM> which may be moveable between an unlocked mode and a locked mode. The lock mechanism <NUM> can include a retention pin that may selectively engage one or more depressions along the main body portion <NUM>, for example.

The augment portion <NUM> may be rotatable in a direction RD (<FIG>) about a longitudinal axis A of the baseplate <NUM> in the unlocked mode. The lock mechanism <NUM> can be moved to the locked mode which may limit movement of the augment portion <NUM> relative to the main body portion <NUM>. <FIG> illustrates the augment portion <NUM> in a first position relative to the longitudinal axis A and peripheral apertures <NUM>. <FIG> illustrates augment portion <NUM>' in a second, different position relative to longitudinal axis A' and peripheral apertures <NUM>'. As illustrated in <FIG>, augment portion <NUM>' may be positioned such that first and second reference planes R1', R2' established by the augment portion <NUM>' may differ from a position of the first and second reference planes R1, R2 established by the augment portion <NUM> of <FIG>. The channels <NUM> may be dimensioned to receive a respective fastener inserted through an adjacent peripheral aperture <NUM> at different positions relative to baseplate <NUM> such as different circumferential positions relative to the longitudinal axis A. The augment portion <NUM> may be positioned relative to the peripheral apertures <NUM> which may improve contact between the augment portion <NUM> and surface contour along a surgical site and may improve fixation of fasteners received in the respective apertures <NUM>.

The novel implants and methods of this disclosure may provide versatility in securing the implants with fasteners to bone at a surgical site. The disclosed implants and augment geometries can be utilized to closely approximate a dimension of a bone surface, such as a bone void, which can lead to improved healing at the surgical site. The disclosed patterns of peripheral apertures can be utilized to improve fixation of the respective implant by selecting a pattern based on a geometry of the surgical site and bone thicknesses at the respective positions of the peripheral apertures. The disclosed baseplates can have a circular or non-circular geometry. The disclosed baseplates having substantially circular geometry may be utilized to orient the augment portion of the baseplate in a multitude of directions to establish a "best fit" for the augment portion, while ensuring that the peripheral screws may be in an optimal position. Additionally, having multiple orientations of the augment portion may help preserve glenoid bone during the preparation for the baseplate.

Although the different non-limiting embodiments are illustrated as having specific components or steps, the embodiments of this disclosure are not limited to those particular combinations. It is possible to use some of the components or features from any of the non-limiting embodiments in combination with features or components from any of the other non-limiting embodiments.

It should further be understood that although a particular component arrangement is disclosed and illustrated in these exemplary embodiments, other arrangements could also benefit from the teachings of this disclosure.

Claim 1:
An orthopaedic implant (<NUM>) comprising:
a baseplate (<NUM>, <NUM>) including a plate body (<NUM>, <NUM>) extending along a longitudinal axis (A) between a front face (<NUM>, <NUM>) and a rear face (<NUM>, <NUM>), and including an anchoring stem (<NUM>) extending outwardly from the rear face (<NUM>, <NUM>);
wherein the plate body (<NUM>, <NUM>) includes a main body portion (<NUM>, <NUM>) establishing the front face (<NUM>, <NUM>), an augment portion (<NUM>, <NUM>) extending outwardly from the main body portion (<NUM>, <NUM>) to establish an augment face section (<NUM>, <NUM>) of the rear face (<NUM>, <NUM>), and a plurality of peripheral apertures (<NUM>, <NUM>) circumferentially distributed about the longitudinal axis (A), wherein the peripheral apertures (<NUM>, <NUM>) are dimensioned to receive respective fasteners for securing the baseplate (<NUM>, <NUM>) to a surgical site;
wherein the augment face section (<NUM>, <NUM>) is arranged transversely relative to the longitudinal axis (A), and first and second reference planes (R1, R2) arranged perpendicular to each other extend along the longitudinal axis (A) such that the first reference plane (R1) bisects the augment face section (<NUM>, <NUM>);
characterized in, that
wherein all peripheral apertures (<NUM>, <NUM>) of the baseplate (<NUM>, <NUM>) that are arranged about the longitudinal axis (A) are circumferentially offset from both of the first and second reference planes (R1, R2).