Method and instrumentation for patello-femoral joint replacement

Abstract

The present invention provides a patellofemoral prosthesis (10) that provides smooth articulation of the articulating surfaces throughout the full range of motion. At the same time, the present invention also provides a novel structure of the femoral implant component (12) that facilitates super-strong bonding to the femoral head. Also available is a patellofemoral arthroplasty system that utilizes precise, reproducible bone preparation techniques that are unique in that they minimize the complexity of subsequent revision and complete knee arthroplasty procedures. The present invention also provides a drill guide (90) and a cutting guide (44), each of which is configured to provide three-point stability during surgery.

Description

technical field [0001] The present invention relates generally to novel orthopedic joint replacement implants and methods, and in particular to improved methods for performing patellofemoral joint replacements through simpler, less invasive surgical procedures using instrumented, reproducible incisions methods and systems. Background technique [0002] Patellofemoral replacement is a well known orthopedic surgery. Various conventional joint replacement devices have been used since the seventies, however, unlike artificial joints commonly used in total knee replacement surgery, conventional patellofemoral replacement devices have not gained widespread acceptance in the orthopedic field . This may be due to somewhat mixed clinical results, which have been demonstrated for conventional patellofemoral arthroplasties in the relevant medical literature. This conventional prosthesis typically includes a femoral component, which is a large, bulky device that is contoured to fit w...

AI Technical Summary

Problems solved by technology

Devices and methods for instructing or guiding surgeons in bone preparation for improved device implantation are not disclosed

The claims in U.S. Patent No. 5,609,644 propose a patellofemoral joint, however, describe only the knee cap replacement component in detail and do not disclose an apparatus or method to assist the surgeon in accurately implanting the device

The system disclosed by Stein does not maintain the anatomical contour of the femur and requires several additional steps in the procedure, thus complicating and tending to complicate the procedure

Unlike the present invention, Stein's method is additionally traumatic due to greater bone loss through Stein's machining of the femoral groove, and at the same time does not conform to standard overall knee geometry, so the implant will Inability to make simple fixes when necessary

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