Ten feet of seven patients with cerebral palsy were surgically corrected for hallux valgus deformity. All patients were ambulatory, and all had symptomatic bunion and hallux valgus deformities before surgery. The mean age of the patients at the time of surgery was 13.8 years (range; 10-18 years). The mean age of the patients at the time of follow-up was 20.7 years (range; 13-25 years). The mean hallux valgus angle was 28° preoperatively, and 1° postoperatively. The operative procedure consisted of distal first metatarsal osteotomy, adductor hallucis muscle transfer, and soft tissue release. Postoperatively, all patients had no pain, and hallux valgus deformities were adequately corrected in six feet, however, varus deformities of hallux were seen in four feet. On two of the four feet, tenotomy and transfer of abductor hallucis muscle were performed and they now have good results with no pain. Apparently spasticity of the abductor hallucis muscle causes varus deformity of the hallux after adductor muscle transfer.
