Ten cases of post-traumatic recurrent dislocation of the peroneal tendons were operated on between 1974 and 1982. In all cases the disturbed superior peroneal retinaculum was reconstructed by transposition of the calcaneofibular ligament to the lateral side of the peroneal tendons. The calcaneal insertion of the calcaneofibular ligament was mobilised with a small bone block and reinserted in its bed after the transposition. After an average follow-up of four years all the results were satisfactory.

1. The treatment is described of a consecutive series of fourteen patients suffering from rheumatoid arthritis causing a slip of the cervical vertebrae, mainly at the C.1-2 level, and a cord lesion.

2. The importance of a change of symptoms and signs in these patients, especially the occurrence of the so-called "alarm signs", is stressed.

3. In twelve patients the combination of this kind of cervical instability with a cord lesion was treated by fusion, most frequently of occiput to C.2 and 3.

4. In the eleven patients who survived the operation the results with a follow-up period of one to eight years are considered highly gratifying.

5. Technical details and various problems associated with treatment are discussed.