[The variation of the anchoring forces of knee endoprostheses due to the different conceptions and the positioning of the joints (author's transl)].

The stresses in the bone structure caused by the anchoring of a knee endoprosthesis depends on the type of the implanted prosthesis and on the positioning of the joint in respect to the directions of loading. The degree of valgus position at all has a relatively great influence on the reaction forces which have to be transmitted in the bone cement bone interface. Using simple models these characteristics can be clarified for hinged type joints as well as for condylar prostheses.