Chronic posterolateral instability of the knee

Posterolateral instability of the knee joint is known to be one of the most disabling injuries of the knee. Despite the surgeon's efforts, it often remains unrecognized in the acute phase. Although many techniques have been described to treat it, there are still controversies about the results, and sometimes it is difficult to use them in every case. We present a technique using the semitendinous while preserving the distal insertion to make both passive and active reinforcement of the damaged structures.