Modular implant system with fully porous coated sleeve

Abstract

A modular knee implant system allows a surgeon to select between several different styles of distal femoral implant components and several different styles of stem extensions while also allowing for use of a metaphyseal component. The metaphyseal component can be a universal one that is usable with all of the styles of distal femoral implant components through use of an adapter. A second adapter allows for use of stem extensions with different types of connectors with the metaphyseal component. A separate metaphyseal component could also be provided with a distal Morse taper post to mate with a distal femoral component having a proximal Morse taper bore. The metaphyseal component may have an outer surface that is configured to maximize contact area with the patient's bone, and may have a surface finish over a substantial part of its overall length that is conducive to bone ingrowth.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This is a divisional application of U.S. patent Ser. No. 10 / 817,051 entitled “MODULAR IMPLANT SYSTEM WITH FULLY POROUS COATED SLEEVE”, which is incorporated by reference herein in its entirety.BACKGROUND OF INVENTION[0002]The present invention relates generally to prosthetic joints and, more particularly, to modular orthopaedic knee implant systems.[0003]The knee joint basically consists of the bone interface of the distal end of the femur and the proximal end of the tibia. Appearing to cover or at least partially protect this interface is the patella which is a sesamoid bone within the tendon of the long muscle (quadriceps) on the front of the thigh. This tendon inserts into the tibial tuberosity and the posterior surface of the patella is smooth and glides over the femur.[0004]The femur is configured with two knob like processes (the medial condyle and the lateral condyle) which are substantially smooth and which articulate with the med...

AI Technical Summary

Benefits of technology

"The present invention provides an orthopaedic implant system that allows the orthopaedic surgeon to select the implant components that best suit the needs of an individual patient. This is achieved through a modular system that includes a first component, a tapered metaphyseal component, and an adapter for connecting the two components. The tapered metaphyseal component has a wide end, a narrow end, and an overall length between the wide end and narrow end. The tapered outer surface of the metaphyseal component is porous over a majority of its length. The system also includes stem extensions for attachment to the metaphyseal component. The technical effects of this invention include greater flexibility in selecting implant components, improved outcomes for individual patients, and reduced surgery time and complexity."

Problems solved by technology

On occasion, the primary knee prostheses fails.

Failure can result from many causes, including wear, aseptic loosening, osteolysis, ligamentous instability, arthrofibrosis and patellofemoral complications.

In such cases, the trauma or disease can lead to significant amounts of bone loss.

Although each of the implant systems available from DePuy Orthopaedics provides the surgeon with many options in both primary and revision surgery, many of the components of each individual system are generally not interchangeable with the components of the other systems.

This lack of interchangeability of system components is also present in implant systems available from other suppliers of orthopaedic implant systems.

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