The treatment of 7 cases of tendon dislocation that we have experienced in these 3 years was reported in this paper. They were 3 cases of peroneus tendon and 4 cases of tibialis posterior tendon. The cases with tendon dislocatin were found in 3.2 per cent of the patients treated for ankle injury, and the ratio was higher than the prior other reports. But taking notice of this kind of injury, more cases will be found. The mean age of the patients was 24 years old, these injury used to be caused by sport in young men. Enforced varus cause the peroneus tendon to dislocate and enforced valgus cause the dislocation of tibialis posterior tendon. Chief complaint were local pain and abnormal elevation. The dislocation was diagnosed easily and surely with tendovaginography. Du Vries' operation was a easy and reliable treatment but bone block should be slided within ten mm not to remain post operative local pain.
