WO2023034042A1

WO2023034042A1 - Cementless patellofemoral joint implant

Info

Publication number: WO2023034042A1
Application number: PCT/US2022/040854
Authority: WO
Inventors: Jacob NEW
Original assignee: Smith & Nephew, Inc.; Smith & Nephew Orthopaedics Ag; Smith & Nephew Asia Pacific Pte. Limited
Priority date: 2021-08-30
Filing date: 2022-08-19
Publication date: 2023-03-09
Also published as: EP4340779A1; AU2022339779A1

Abstract

A PFJ implant (100) and correspond method for implanting the PFJ implant is disclosed. In some embodiments, the PFJ implant is arranged and configured to be positioned (e.g., received, insetted, etc.) within a pocket formed in the patient's femur. In addition, and/or alternatively, the PFJ implant is arranged and configured to be implanted without the need for cement (e.g., cementless application). Thus arranged, the PFJ implant may be referred to as an insetted, cementless PFJ implant. In some embodiments, the pocket may be formed by an orthopedic robotic surgical system and the PFJ implant may be coupled within the pocket via an interference fit between the PFJ implant and the walls of the pocket.

Description

CEMENTLESS PATELLOFEMORAL JOINT IMPLANT

CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] This is a non-provisional of, and claims the benefit of the filing date of, pending U.S. provisional patent application number 63/238,338, filed August 30, 2021, entitled “Cementless Patellofemoral Joint Implant” the entirety of which application is incorporated by reference herein.

FIELD OF THE DISCLOSURE

[0002] The present disclosure relates generally to orthopedic devices and more particularly to a cementless patellofemoral joint implant arranged and configured to be insetted (e.g., received) within a pocket formed in the patient’s bone.

BACKGROUND OF THE DISCLOSURE

[0003] Orthopedic implants are well known and commonplace in today’s society. Orthopedic implants may be used, for example, to stabilize an injury, to support a bone fracture, to fuse a joint, and/or to correct a deformity. Orthopedic implants may be attached permanently or temporarily, and may be attached to the bone at various locations, including implanted within a canal or other cavity of the bone, implanted beneath soft tissue and attached to an exterior surface of the bone, or disposed externally and attached by fasteners such as screws, pins, and/or wires. Some orthopedic implants allow the position and/or orientation of two or more bone pieces, or two or more bones, to be adjusted relative to one another. [0004] The knee joint is a frequent place for joint damage, and the loss of normal

(i.e., relatively pain-free) ambulatory function is a frequent result of such damage. Many different causes, or combination of causes, result in knee joint damage. For example, a modest overextension of a knee weakened by osteoporosis can result in damage.

Moreover, the extent of the damage to the knee joint can vary greatly depending on the cause, age of the patient, pre-existing conditions and other factors.

[0005] The knee is a common source of problems because the joint has an unusually large range of motion and bears nearly half of the weight of the entire body. A primary knee movement, known as flexion-extension movement, includes bending (flexion) and straightening (extension) of the leg in which a lower part of the leg (tibia and fibula bones) flexes in relation to an upper part of the leg (femur bone). The knee joint can also accommodate a certain amount of rotational motion in which the lower leg rotates a few degrees in relation to the upper leg. This wide range of motion requires extensive contact surface between the femur and the tibia. Further, the knee joint is rather loosely held together by tendons and ligaments to permit such a wide range of motion.

[0006] The front, or anterior side, of the knee joint is protected by the kneecap or patella. The patella is held in place by ligaments and slides over a femoral joint surface during flexion-extension movement. The patella and its ligaments are mechanically involved in joint extension. If any of the joint surfaces (e.g., femoral surface, patellar surface, or tibial surface) becomes damaged or roughened, the knee joint will not operate properly, and the patient is likely to experience significant pain. [0007] One known problem is damage to the patellofemoral joint that causes free motion of the patella to be inhibited and/or painful. Patellofemoral joint (PFJ) damage can prohibit normal joint movement.

[0008] A variety of orthopedic implant replacements have been developed for different joint surfaces of the knee joint. In extreme cases, the entire joint can be replaced with an orthopedic implant, which is often referred to as a total knee replacement. However, total knee replacement requires considerable time for recovery, and it may be advantageous to replace only the damaged part of the joint in less extreme cases.

[0009] In some cases, PFJ damage may be adequately addressed with a PFJ arthroplasty, as opposed to a total knee replacement. PFJ arthroplasty surgery is less drastic than total knee replacement. It is designed for patients whose main problems involve only the patellofemoral part of the knee and is directed to providing a smooth sliding relationship between the femur and the patella. The surface of the femur on which the patella slides is referred to as the trochlear groove. The trochlear groove is the indentation or groove located between the medial and lateral condylar surfaces at the distal end of the femur.

[0010] In prior art PFJ orthopedic implant systems, an orthopedic patellar bearing surface is introduced. The orthopedic bearing surface typically includes an anchoring portion for receiving natural patellar remnants. As a result, the final patellar structure may include a posterior orthopedic bearing surface and an anterior natural patella surface. The anterior natural patella surface typically retains the connective tissue that connects the patella to the quadriceps and tibia. [0011] In order to achieve adequate translational movement of the orthopedic patellar bearing surface, particularly in the presence of damage to the trochlear groove, a cooperating orthopedic femur implant is typically affixed onto the end of the femur. The orthopedic femoral implant in most cases includes a bearing surface that is specially adapted to receive the orthopedic patellar bearing surface to ensure reliable travel during flexion movement.

[0012] However, disadvantages associated with current systems is that compatibility with total knee replacement systems is limited. In addition, in many cases, the PFJ implant system requires significant amounts of bone removal as to render subsequent total knee replacement almost impossible. For example, a series of planar cuts is often preformed on the distal end of the patient’ s femur resulting in significant amounts of bone removal along the outer surface of the patient’s tibial. Finally, current PFJ implant systems require cement to affix the PFJ implant to the patient’s bone.

[0013] Thus, it would be beneficial to provide a PFJ implant that minimizes the amount of bone removal needed for implantation. In addition, it would be beneficial to provide a PFJ implant that is attached to the patient’s bone without cement (e.g., cementless application).

SUMMARY OF THE DISCLOSURE

[0014] This Summary is provided to introduce a selection of concepts in a simplified form that are further described below in the Detailed Description. This Summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended as an aid in determining the scope of the claimed subject matter.

[0015] The present disclosure illustrates and describes various embodiments of a cementless patellofemoral joint (“PFJ”) implant arranged and configured to be positioned within a pocket formed in a patient’s femur. In some embodiments, the PFJ implant includes a bone-facing inner surface, a patella contacting outer surface opposite thereof, and a periphery extending between the bone-facing inner surface and the patella contacting outer surface, the bone-facing inner surface includes a non-facetted bonefacing surface arranged and configured to be positioned within the pocket formed in the patient’s femur, the bone-facing surface including a chamfer surface formed along the periphery of the implant, the chamfer surface arranged and configured to provide an interference fit, a press-fit, etc. with a periphery or wall of the pocket.

[0016] In some embodiments, the non-facetted bone-facing surface is arranged and configured to substantially match the contours of the inner surface of the pocket so that protrusion of the outer surface from the pocket is minimized. That is, the implant is arranged and configured so that the patella contacting outer surface substantially matches an outer surface of the patient’s femur so that the implant does not protrude substantially beyond the pocket.

[0017] In some embodiments, the chamfer surface is arranged and configured as a tapered surface extending between the outer surface and the bone-facing inner surface (e.g., tapered surface extends from the patella contacting outer surface towards the bonefacing inner surface). [0018] In some embodiments, the bone-facing inner surface includes a porous coating to enhance bone-in growth and long-term fixation.

[0019] In some embodiments, the PFJ implant includes a plurality of pegs extending from the bone-facing inner surface.

[0020] In some embodiments, the pocket is formed by an orthopedic robotic surgical system.

[0021] A method for implanting a cementless PFJ implant into a patient’s femur is also disclosed. The method including forming a contoured pocket in a patient’s femur using an orthopedic robotic surgical system and implanting a PFJ implant into the pocket formed in the patient’ s femur, wherein the PFJ implant is secured within the pocket via an interference fit, a press-fit, etc. between a chamfer surface of the implant and a periphery or wall of the pocket.

[0022] In some embodiments, implanting the PFJ implant into the pocket formed in the patient’s femur is devoid of any cement.

[0023] In some embodiments, the PFJ implant includes a bone-facing inner surface having a non-facetted bone-facing surface defining non-planar curves arranged and configured to match inner contours of the pocket.

[0024] In some embodiments, forming the contoured pocket in the patient’s femur is performed so that a depth of the pocket substantially matches a thickness of the implant so that the implant does not protrude substantially beyond the pocket. [0025] In some embodiments, the method further includes forming a plurality of holes in the patient’s femur within the confines of the pocket and implanting the patellofemoral implant into the pocket formed in the patient’ s femur includes inserting a plurality of pegs extending from a bone-facing inner surface of the patellofemoral implant within the plurality of holes.

[0026] Embodiments of the present disclosure provide numerous advantages. For example, by insetting the PFJ implant within a pocket formed in the patient’s bone, less bone removal is required (e.g., need to create a plurality of planar cuts is eliminated). In addition, the PFJ implant can be implanted and coupled to the patient’s femur without cement (e.g., cementless application) thereby eliminating the need for injecting any cement into the patient’s body.

[0027] Further features and advantages of at least some of the embodiments of the present invention, as well as the structure and operation of various embodiments of the present invention, are described in detail below with reference to the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

[0028] By way of example, specific embodiments of the disclosed device will now be described, with reference to the accompanying drawings, in which:

[0029] FIG. 1 illustrates a perspective view of an embodiment of a patellofemoral implant coupled to a patient’s femur in accordance with one or more features of the present disclosure; [0030] FIG. 2 illustrates a perspective view of the bone-facing surface of the patellofemoral implant shown in FIG. 1;

[0031] FIG. 3 illustrates a perspective view of the outer or patella contacting surface of the patellofemoral implant shown in FIG. 1;

[0032] FIGS. 4A-4C illustrate various perspective views of the pocket formed in the patient’ s femur, the pocket configured to receive the patellofemoral implant shown in FIG. 1; and

[0033] FIG. 5 is a diagram illustrating an environment for operating an orthopedic robotic surgical system for planning and performing an arthroplasty surgery (e.g., for creating the pocket in the patient’s femur for receiving the patellofemoral implant shown in FIG. 1) in accordance with one or more features of the present disclosure.

[0034] The drawings are not necessarily to scale. The drawings are merely representations, not intended to portray specific parameters of the disclosure. The drawings are intended to depict various embodiments of the disclosure, and therefore are not to be considered as limiting in scope. In the drawings, like numbering represents like elements.

DETAILED DESCRIPTION

[0035] Various features or the like of a patellofemoral joint (“PFJ”) implant will now be described more fully herein with reference to the accompanying drawings, in which one or more features of the PFJ implant will be shown and described. It should be appreciated that the various features may be used independently of, or in combination, with each other. It will be appreciated that a PFJ implant as disclosed herein may be embodied in many different forms and may selectively include one or more features described herein. As such, the PFJ implant should not be construed as being limited to the specific embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will convey certain features of the PFJ implant to those skilled in the art.

[0036] As will be described in greater detail herein, in accordance with one or more features of the present disclosure, the PFJ implant is arranged and configured to be positioned, received, insetted, etc. (terms used interchangeably without the intent to limit or distinguish) within a corresponding pocket formed in the patient’s femur. In some embodiments, the pocket may be formed by an orthopedic robotic surgical system. For example, the pocket may be formed by a burr coupled to the end of a robotic arm in an orthopedic robotic surgical system. Thus arranged, the need to perform a series of manual, planar cuts is eliminated thereby preserving more of the patient’ s existing bone (e.g., less bone removal is required). In addition, and/or alternatively, in accordance with one or more features of the present disclosure, the PFJ implant is arranged and configured to be implanted without the need for cement (e.g., cementless application).

[0037] That is, in use, the PFJ implant may be arranged and configured to be received within a pocket formed in the patient’s femur. In some embodiments, the PFJ implant may be received within the pocket via an interference fit, a press-fit, etc. (terms used interchangeably herein without the intent to limit or distinguish). Thus, the PFJ implant may be implanted without the need for cement by forming and placing the PFJ implant into a pocket formed in the patient’s femur. As a result, less bone removal and enhanced fixation is achieved. In use, initial primary fixation may be provided by an interference fit between the PFJ implant and the walls or periphery of the pocket. Longterm, secondary fixation may be achieved by osseointegration with the porous, bonefacing inner surfaces of the PFJ implant.

[0038] Referring to FIGS. 1-4C, an embodiment of a patellofemoral joint (“PFJ”) implant 100 will now be shown and described. In use, the PFJ implant 100 is arranged and configured to resurface the patellofemoral region of a patient’s knee (e.g., a patient’s femur F). In use, the PFJ implant 100 may be used in combination with an unresurfaced patella (e.g., a natural patella) or with any resurfaced patella implant, such as a domeshaped patella implant or an oval patella implant.

[0039] In some embodiments, as shown, the PFJ implant 100 includes a body 101 including a bone-facing inner surface 102 and a patella contacting outer surface 104 opposite thereof. In addition, the PFJ implant 100 includes a proximal portion or region 110 and a distal portion or region 112 defining a medial portion or region 114, a lateral portion or region 116, and an intracondylar notch portion or region 118. The intracondylar notch portion or region 118 is arranged and configured to provide a smooth transition to the femoral condyles. In some embodiments, the medial portion or region 114 and the lateral portion or region 116 are shaped to provide maximum bone coverage of the anterior femur F. [0040] In some embodiments, the lateral portion or region 116 may have an increased thickness in the proximal portion or region 110 to prevent patellar subluxation (e.g., in the proximal region, at least a portion of the lateral region has an increased thickness between the inner surface and the outer surface as compared to the medial region). In some embodiments, the medial portion or region 114 may have less material than the lateral portion or region 116 in the proximal portion or region 110. This may be done for several reasons. For example, the medial portion or region 114 may have less material in order to decrease the overall size of the PFJ implant 100, to reduce the weight of the PFJ implant 100, or to allow the PFJ implant 100 to achieve a better fit.

[0041] As illustrated, in some embodiments, the PFJ implant 100 may include a patellofemoral groove 120 formed in the outer surface 104. In use, the groove 120 is arranged and configured to enable the patella to track therein (e.g., the groove 120 forms a curved outer surface, or bearing surface, in which the patella tracks). In some embodiment, the groove 120 may be lateralized in the proximal portion or region 110 to allow the patella to track normally, regardless of whether the patella has been resurfaced or not. The patella is lateralized in extension and transitions to the intracondylar notch portion or region 118 in flexion as it moves in the groove 120.

[0042] In some embodiments, the bone-facing inner surface 102 includes a nonfacetted bone facing surface. As will be described in greater detail herein, in accordance with one or more features of the present disclosure, the PFJ implant 100 is arranged and configured to be positioned within a pocket 200 formed in the patient’s femur. In use, the non-facetted bone facing surface includes curves (e.g., non-planar) so that the bone facing inner surface 102 is arranged and configured to substantially match the inner contours of the pocket 200. Thus arranged, in use, as best illustrated in FIG. 1, the PFJ implant 100 is arranged and configured to reside within the pocket 200 formed in the patient’s femur F rather than sitting atop of the patient’s resected outer bone surface. As such, the PFJ implant 100 is arranged and configured to substantially match or correspond with the removed bone (e.g., pocket 200). In use, the PFJ implant 100 replaces substantially what is removed during formation of the pocket 200 to eliminate, or at least minimize, bone removal from the patient’s femur F. In some embodiments, as illustrated in FIG. 1, the depth of the pocket 200 formed in the patient’s femur F substantially matches a thickness of the PFJ implant 100 so that the PFJ implant 100 does not protrude substantially beyond the pocket 200.

[0043] In some embodiments, the bone-facing inner surface 102 includes one or more features to enhance fixation. For example, the bone-facing inner surface 102 may include a porous coating 103 to enhance bone-in growth and long-term fixation. In addition, the PFJ implant 100 may include a plurality of projections, anchors, or pegs 130 extending from the bone-facing inner surface 102, each of the plurality of pegs 130 being arranged and configured to be received within a hole, a bore, etc. 202 formed in the patient’s femur F within the confines of the pocket 200. In some embodiments, as illustrated, the PFJ implant 100 may include three anterior pegs 130A and one distal peg 130B, but this is but one configuration and the implant may include more or less pegs in similar or different configurations. For example, in some embodiments, the distal peg 130B may be omitted entirely or the PFJ implant 100 may include a plurality of distal pegs 130B. In some embodiments, the distal peg 130B may be angled relative to the anterior pegs 130A to enhance fixation. In some embodiments, the distal peg 130B may be oblique relative to the anterior pegs 130A.

[0044] In accordance with one or more features of the present disclosure, as illustrated, the PFJ implant 100 may include an inset or chamfer surface 150 formed along a periphery of the bone-facing inner surface 102. In some embodiments, the inset or chamfer surface 150 is arranged and configured as a taper surface extending between the outer surface 104 and the bone-facing inner surface 102, the chamfer surface 150 tapering inward as it moves from the outer surface 104 towards the bone-facing inner surface 102. As illustrated, the inset or chamfer surface 150 may include approximately a 20 to 30 degree taper, more preferably a 25-degree taper. In use, the inset or chamfer surface 150 is arranged and configured to create an initial interference fit with the pocket 200 formed in the patient’s femur F (e.g., the inset or chamfer surface 150 creating an initial interference fit with a wall or periphery 204 of the pocket 200 formed in the patient’s femur F). While the inset or chamfer surface 150 has been illustrated and described as a tapered surface, alternate configurations are allowed such as, for example, a straight surface including a recessed ledge.

[0045] Referring to FIG. 5, in some embodiments, as previously mentioned, the pocket 200 may be created by a burr attached to an end of an orthopedic robotic surgical system. As illustrated, the orthopedic robotic surgical system 400 is arranged and configured to create or form the pocket 200 in a patient’s femur. In some embodiments, system 400 may be or may include an image-free (for instance, CT-less) system. In other embodiments, system 400 may be or may include an image-based system based on diagnostic image data. In various embodiments, system 400 may operate using a combination of image-free and image-based processes. Embodiments are not limited in this context.

[0046] The orthopedic robotic surgical system 400 may include a surgical cutting tool 450 arranged and configured to create or form the pocket 200 in the patient’s femur F.

For example, in some embodiments, the surgical cutting tool 450 may be a burr. As illustrated, the surgical cutting tool 450 may be associated with an optical tracking frame 455 (also referred to as tracking array 455). In addition, the orthopedic robotic surgical system 400 may include a graphical user interface 430, an optical tracking system 440, and patient tracking frames 420 (also referred to as tracking arrays 420). The illustration also includes an incision 410 through which the pocket 200 in the patient’s femur may be performed. In an example, the illustrated robotic surgical system 400 depicts a hand-held computer-controlled surgical robotic system, for instance, the same or similar to the CORI® Surgical System from Smith Nephew, Inc. The orthopedic robotic surgical system 400 may use an optical tracking system 440, or other type of tracking system, coupled to a robotic controller to track and control a hand-held surgical instrument. For example, optical tracking system 440 tracks tracking array 455 coupled to surgical tool 450 and tracking arrays 420 coupled to the patient to track locations of the instrument relative to the target bone (e.g., femur).

[0047] The PFJ implant 100 may be manufactured from any suitable biocompatible material now known or hereafter developed. For example, the PFJ implant 100 may be made from cobalt chromium, stainless steel, titanium, oxidized zirconium, or other metal alloys. Alternatively, the PFJ implant 100 may be manufactured from standard polyethylene, cross-linked polyethylene, ultra-high molecular weight plastic, other plastics, or a composite material. In some embodiments, the PFJ implant 100 is manufactured from oxinium and includes a porous coating 103 applied thereto. In some embodiments, the porous coating 103 may be printed, sprayed, sintered, or bonded onto the bone facing surfaces of PFJ implant 100. For example, the porous coating 103 may be formed by titanium, cobalt chrome, zirconium, oxidized zirconium, tantalum, or stainless steel over the bone facing surfaces of the PFJ implant. In some embodiments, the PFJ implant 100 has a low nickel content.

[0048] While the present disclosure refers to certain embodiments, numerous modifications, alterations, and changes to the described embodiments are possible without departing from the sphere and scope of the present disclosure, as defined in the appended claim(s). Accordingly, it is intended that the present disclosure not be limited to the described embodiments, but that it has the full scope defined by the language of the following claims, and equivalents thereof. The discussion of any embodiment is meant only to be explanatory and is not intended to suggest that the scope of the disclosure, including the claims, is limited to these embodiments. In other words, while illustrative embodiments of the disclosure have been described in detail herein, it is to be understood that the inventive concepts may be otherwise variously embodied and employed, and that the appended claims are intended to be construed to include such variations, except as limited by the prior art.

[0049] The foregoing discussion has been presented for purposes of illustration and description and is not intended to limit the disclosure to the form or forms disclosed herein. For example, various features of the disclosure are grouped together in one or more embodiments or configurations for the purpose of streamlining the disclosure. However, it should be understood that various features of the certain embodiments or configurations of the disclosure may be combined in alternate embodiments, or configurations. Any embodiment or feature of any section, portion, or any other component shown or particularly described in relation to various embodiments of similar sections, portions, or components herein may be interchangeably applied to any other similar embodiment or feature shown or described herein. Additionally, components with the same name may be the same or different, and one of ordinary skill in the art would understand each component could be modified in a similar fashion or substituted to perform the same function.

[0050] Moreover, the following claims are hereby incorporated into this Detailed Description by this reference, with each claim standing on its own as a separate embodiment of the present disclosure.

[0051] As used herein, an element or step recited in the singular and proceeded with the word “a” or “an” should be understood as not excluding plural elements or steps, unless such exclusion is explicitly recited. Furthermore, references to “one embodiment” of the present disclosure are not intended to be interpreted as excluding the existence of additional embodiments that also incorporate the recited features.

[0052] The phrases “at least one”, “one or more”, and “and/or”, as used herein, are open-ended expressions that are both conjunctive and disjunctive in operation. The terms “a” (or “an”), “one or more” and “at least one” can be used interchangeably herein. All directional references (e.g., proximal, distal, upper, lower, upward, downward, left, right, lateral, longitudinal, front, back, top, bottom, above, below, vertical, horizontal, radial, axial, clockwise, and counterclockwise) are only used for identification purposes to aid the reader’s understanding of the present disclosure, and do not create limitations, particularly as to the position, orientation, or use of this disclosure. Connection references (e.g., engaged, attached, coupled, connected, and joined) are to be construed broadly and may include intermediate members between a collection of elements and relative to movement between elements unless otherwise indicated. As such, connection references do not necessarily infer that two elements are directly connected and in fixed relation to each other. All rotational references describe relative movement between the various elements. Identification references (e.g., primary, secondary, first, second, third, fourth, etc.) are not intended to connote importance or priority but are used to distinguish one feature from another. The drawings are for purposes of illustration only and the dimensions, positions, order and relative to sizes reflected in the drawings attached hereto may vary.

Claims

CLAIMS I claim:

1. A cementless patellofemoral implant arranged and configured to be received within a corresponding pocket formed in a patient’s femur, the patellofemoral implant comprising: a body including a bone-facing inner surface, a patella contacting outer surface opposite the bone-facing inner surface, a periphery extending between the bone-facing inner surface and the patella contacting outer surface, a proximal region, a distal region, a medial region, a lateral region, an intercondylar notch region, and a chamfer surface formed along the periphery, the chamfer surface arranged and configured to contact a wall of the pocket.

2. The patellofemoral implant of claim 1, wherein the chamfer surface is tapered as it extends from the patella contacting outer surface towards the bone-facing inner surface.

3. The patellofemoral implant of claim 1, wherein the chamfer surface is tapered by approximately a 25-degree taper.

4. The patellofemoral implant according to any of the preceding claims, wherein the chamfer surface is arranged and configured to create an initial interference fit with the wall of the pocket formed in the patient’ s femur.

5. The patellofemoral implant according to any of the preceding claims, wherein the bone-facing inner surface includes a non-facetted bone-facing surface defining non-planar curves arranged and configured to match inner contours of the pocket.

6. The patellofemoral implant according to any of the preceding claims, wherein the implant is arranged and configured to reside within the pocket formed in the patient’s femur as opposed to sitting atop of an outer surface of the patient’s femur.

7. The patellofemoral implant according to any of the preceding claims, wherein the implant is arranged and configured so that the patella contacting outer surface substantially matches an outer surface of the patient’s femur so that the implant does not protrude beyond the pocket.

8. The patellofemoral implant according to any of the preceding claims, wherein the bone-facing inner surface includes a porous coating thereon.

9. The patellofemoral implant according to any of the preceding claims, wherein the bone-facing inner surface includes a plurality of pegs extending therefrom.

10. The patellofemoral implant of claim 9, wherein the plurality of pegs include a plurality of anterior pegs extending from the anterior region of the implant and a single distal peg extending from the distal region of the implant.

11. The patellofemoral implant of claim 10, wherein the distal peg is angled relative to the anterior pegs.

12. A method for implanting a cementless patellofemoral implant into a patient’s femur, the method comprising: forming a pocket in the patient’s femur using an orthopedic robotic surgical system; and implanting a patellofemoral implant into the pocket formed in the patient’s femur, wherein the patellofemoral implant is secured within the pocket via an interference fit between a chamfer surface of the implant and a wall of the pocket.

13. The method of claim 12, wherein implanting the patellofemoral implant into the pocket formed in the patient’ s femur is devoid of any cement.

14. The method of claim 12, wherein the patellofemoral implant includes a bone-facing inner surface having a non-facetted bone-facing surface defining non-planar curves arranged and configured to match inner contours of the pocket.

15. The method of claim 12, wherein forming the pocket in the patient’s femur is performed so that a depth of the pocket substantially matches a thickness of the implant so that the implant does not protrude beyond the pocket.

16. The method of claim 12, further comprising forming a plurality of holes in the patient’s femur within the confines of the pocket and implanting the patellofemoral implant into the pocket formed in the patient’ s femur includes inserting a plurality of pegs extending from a bone-facing inner surface of the patellofemoral implant within the plurality of holes.