Importance

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Abstract

A knee joint endoprosthesis includes a shaft piece (1) which is anchored in the femur bone and a connected femur component (2) with two gliding runners (3, 4), which are anteriorly connected by a bridge (6) carrying a connecting element (5) to the shaft piece (1) and defining between the runners a groove (7) extending anteriorly to posteriorly. This groove is bordered on both sides, in the femur direction, by struts (8, 8') which have channels (9, 9') with a partially circular cross section running laterally from the groove and aligned with each other. The tibia component (10) has two gliding surfaces (11, 12), on which the gliding runners (3, 4) of the femur component (2) perform a gliding movement, a strut (13) which is directed toward the femur between the two gliding surfaces (11, 12) and reaches through the groove (7) of the femur component (2) and rides tightly against its inner surfaces. The tibia component (10) has in the upper region of the strut (13) a cylindrical guide bolt (14, 15) extending laterally from the center, which lies in the channels (9, 9') of the struts (8, 8') of the femur component (2) and is secured in position by enclosing parts (17) of the shaft piece (1). The endoprosthesis has more stability than conventional hinged prostheses.

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First Claim