[Peroneus tertius tendon repair following old traumatic rupture of the anterior tibial tendon (casuistry)].

The etiology of anterior tibial tendon rupture and the results after secondary operation are described in one patient. A new operative technique using his peroneus tertius tendon as a free graft was performed. Follow-up after only 5 months showed almost normalized function in comparison to the uninjured leg. No additional loss of function owing to the operative method was noted. Ultrasound is of the highest diagnostic value in detecting the injury and in controlling the course of healing.