Total knee endoprosthesis with fixed flexion-extension axis of rotation
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United States of America Patent
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-
Jul 5, 1994
Issued Date -
N/A
app pub date -
May 26, 1993
filing date -
Sep 16, 1991
priority date (Note) -
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status (Latency Note)
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Abstract
The invention is a total knee endoprosthesis with a fixed flexion-extension axis 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.
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