Abstract
In Japan, most cases of thumb polydactyly undergo the primary operation at around the age of 1 year old. This is a report of a rare case of bilateral thumb polydactyly who underwent the primary operation at the age of 6 years old. The patient, a 6-year-old boy, had untreated bilateral thumb polydactyly of Wassel type Ⅴ and Ⅵ. He first visited our department at the age of 5 years old, and the operation was subsequently performed at the age of 6. On the right side, we removed the lesser ulnar digit. There was no necessity for transition of any tendons. However, the residual axis deviation at the interphalangeal joint that existed preoperatively had functional and cosmetic issues. Revision surgery of correction of the axis by osteotomy is considered. On the left side, we removed the radial digit and transferred the abductor pollicis brevis muscle to the ulnar digit. It had good function and appearance. Compared with treatment in infancy, we could easily perform perioperative assessment and the operation. Considering the development of motor skills and psychosocial aspect, however, it is necessary to educate patients to receive the best treatment at optimal timing.
