Hip joint endoprosthesis with a stem to be anchored in the femur

Details Hip joint endoprosthesis with a stem to be anchored in the femur Hip joint endoprosthesis with a stem to be anchored in the femur

1984-06-22

1987-02-24

Apley, Richard J.

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

Implantable prosthesis

Bone

A61F 232

Patent

active

046455060

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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