The operation is minimally invasive by arthroscopy. In this case, only two or three access points, which are only a few millimeters in size, are necessary for a mini camera and for the finest surgical instruments. As a transplant, either two tendons can be used on the inner side of the thigh (semitendinosus tendon, Gracilis tendon), or a part of the knee rupture tendon (patellar tendon or quadriceps tendon). The fixation takes place using screw-like implants, so-called interference screws, which consist of bio-resorbable material.