[Restoration of fresh and old injuries of the extensior apparatus of the knee-joint (author's transl)].

This paper deals with problems occuring in the operative restoration of the extensor apparatus of the knee-joint (quadriceps tendon, patellar ligament) and refers to indication, suture material, plastic operation by means of a homologous dura graft, by vertical adjustment of the patella, or simultaneous allothroplasty (prosthesis). Special attention is devoted to the possibility of post-traumatic arthroses in the femoro-patellar joint as well as of aseptic patellar necroses after distal pole avulsions.