Total knee endoprosthesis with fixed flexion-extension axis of r

Details Total knee endoprosthesis with fixed flexion-extension axis of r Total knee endoprosthesis with fixed flexion-extension axis of r

1991-09-16

1992-07-28

Green, Randall L.

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

Implantable prosthesis

Bone

A61F 238

Patent

active

051337584

ABSTRACT:
The invention is a total knee endoprosthesis with a fixed flexion-extension xis throughout all degrees of flexion and extension of the knee. The endoprosthesis has a femoral component with spaced apart medial and lateral condyle portions which slidably seat on a tibial implant portion. The fixed flexion-extension axis is directed inferiorly and posteriorly from the medial condyle portion to the lateral condyle portion and is offset from both the transverse and coronal planes equally by 3.0 to 3.8 degrees. A longitudinal axis through the tibia allows the tibia to rotate nonorthogonally and anteriorly of the flexion-extension axis. A patellar groove which is perpendicular to the flexion-extension axis. In the patellar groove slides an optional patellar component or the natural patella.

REFERENCES:
patent: 4085466 (1978-04-01), Goodfellow et al.
patent: 4261064 (1981-04-01), Helfet
patent: 4301553 (1981-11-01), Noiles
patent: 5047057 (1991-09-01), Lawes
patent: 5071438 (1991-12-01), Jones et al.

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