Abstract
1. A study has been made of thirty-two patients who had had operations for their spastic hands. 2. In twenty-seven a flexor muscle slide was done, either by itself or in association with an arthrodesis of the wrist. The rationale of the operation is discussed. 3. The first muscle slide was done in 1959 and the average follow-up was seven and a half years. 4. Selection is crucial : drive, usually coupled with intelligence, is essential for success. 5. Operation is not a replacement for physical therapy. The object is to make rehabilitation easier. The flexor muscle slide, in carefully chosen cases, may play a significant part in achieving this.