We treated thirty-six patients (thirty-eight thumbs) who had residual
deformity after ablation of a duplicated thumb. The deformities were
classified into three groups: interphalangeal (eight thumbs),
metacarpophalangeal (sixteen thumbs), and zigzag (fourteen thumbs). The
indication for operation was primarily cosmetic; only eight patients had a
functional disability, and that was mild. At the most recent follow-up, the
results were rated good except for three fair results in the group that had
an interphalangeal deformity, two fair results in the group that had a
metacarpophalangeal deformity, and two poor and seven fair results in the
group that had a zigzag deformity.