Hip joint endoprosthesis with a stem to be anchored in the femur
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United States of America Patent
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-
Feb 24, 1987
Grant Date -
N/A
app pub date -
Jun 22, 1984
filing date -
Jun 27, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A hip joint endoprosthesis has a downward tapering stem (1) which is to be anchored in the femur and is composed of a main part (7) connected to the condyle head (4) and of a plurality of wedge pieces (10) which are movably guided longitudinally along the main part by means of cooperating guide surfaces (11,12). The friction on the guide surfaces between the main part (7) and the wedge pieces (10) is smaller than the friction caused by the outer surface (13), formed for promoting adhesion, of wedge pieces (10) on the bone. When the medullary cavity receiving the prosthesis stem widens, the load on the main part (7) causes an expansion of the wedge pieces (10) and hence an adaptation of the shape of the prosthesis.
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