The surgical release of flexor tendons from their restricting adhesions has historically been a somewhat controversial procedure. Especially clinical efficacy of tenolysis is dependent on early active digital motion. The administration of long acting anesthetics (Bupivacaine) through indwelling catheter after tenolysis relieved pain and so achieved early active digital motion in 12 cases. The times for tenolysis following tendon repair and the followup period were 3 months and 6 months on an average. According to flexor zones classification, in 4 patients the lesion was in zone II, 5 in zone III, 1 in zone IV and 2 in zone V. The results were as follows; 1. The functional results after tenolysis showed up 7 excellent, 4 good and 1 fair. 2. The subjective results of the postoperative pain relief showed up 8 excellent and 4 good out of 12 cases.