Asymmetric femoral prosthesis

Details Asymmetric femoral prosthesis Asymmetric femoral prosthesis

1994-08-04

1996-08-27

Isabella, David

Prosthesis (i.e., artificial body members), parts thereof, or ai

Implantable prosthesis

Bone

A61F 238

Patent

active

055496881

ABSTRACT:
A knee prosthesis includes a femoral prosthesis member having anterior, distal, and posterior articulating surface portions. The posterior articulating surface portions comprising a pair of condylar surface portions that are positioned at differing distances from the anterior non-articulating surface plane. The posterolateral articulating surface is a greater distance away from the anterior non-articulating surface than the posteromedial articulating surface. The femoral prosthesis has a non-articulating surface that includes a plurality of intersecting surfaces including at least distal, anterior, and posterior surfaces for receiving the patient's distal femur after it has been surgically prepared. A tibial component has concave articulating surfaces that receive the femoral component articulating surface portions during use. The angle of femoral rotation generally about the mechanical axis generally changes when going through a normal range of motion of the patient's knee while maintaining alignment of the femoral and tibial articular surfaces. The femoral prosthesis also has a proximal anterior region that is concave.

REFERENCES:
patent: 4081866 (1978-04-01), Upshaw
patent: 4865606 (1989-09-01), Rehder
patent: 5047057 (1991-09-01), Lawes
patent: 5133758 (1992-07-01), Hollister
patent: 5133759 (1992-07-01), Turner
patent: 5282870 (1994-02-01), Moser et al.
patent: 5314483 (1994-05-01), Wehrli et al.
patent: 5326361 (1994-07-01), Hollister
"Femoral Implant" (single sheet).
"The Technique of Total Knee Arthroplasty-Intraoperative Alignment and Instrumentation", pp. 130-133.
"Genesis Total Knee System", Smith & Nephew Richards Publication on Surgical Technique.

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