[Experimental in vitro studies optimizing the tibial portion of knee joint alloplasty]

The tibial component of knee-joint prostheses loosens more frequently than the femoral portion. In the study reported here it was attempted to define a physiological pressure distribution on the substantia corticalis of the tibia in a comparison using prostheses of various shapes. According to the results of the investigations the prosthesis plate should extend to the corticalis margins, and optimal shaft length is in the range between 8 and 10 cm.