母指多指症の手術例の検討

抄録

Twenty-one children with twenty-three duplicated thumbs who were surgically treated were studied.
On five rudimentary thumbs, simple ablation was done and the results were all good.
The postoperative condition of the six thumbs on which transfer of the abductor pollicis brevis was done were assessed. In two thumbs which were operated on below one year of age, the opposition was poor. But in four thumbs over one year of age, the opposition was good.
Interphalangeal joints of five thumbs were stabilized with a K-wire for three weeks or less, and in the four of them the motion of the interphalangeal joints were restricted. On the other hand, in only two of the eighteen thumbs without any stabilization of the interphalangeal joint, the motion of the interphalangeal joints were restricted.
Angular deformity of the proximal phalanx occurred in two thumbs as a result of physeal growth disturbance. One of them had been operated on at seven months of age and the other eight months.
We conclude that (1) the rudimentary type of the duplicated thumb can be treated surgically in the early infant, and (2) the other types of duplicated thumb should be treated surgically over one year of age to avoid the technical failures such as injury to the growh plate, incorrect transfer of the abductor pollicis brevis.