The occurrence of three phalanges in the human thumb is a very rare deformity. Struthers published the first case in 1863. In the following 30 years, 10 cases only were reported,11 and up till 1916 Stieve, reviewing all the literature, could collect only 39 cases.5 The condition was mentioned very scarcely after that. For 25 years not a single case had been seen by Dr. M. Power-any in the Radiological Department of the Hospital for Joint Diseases. P. W. Lapidus and others had to examine 75,000 persons to discover only 3 cases with triphalangeal thumbs (0.004%).6 The following case is thus worth recording.
A. A., a man, 65 years old, came complaining of contusion of his chest, in an accident. That was his first visit to a physician all through his life. His hands had a curious shape. Dorsally, both thumbs were longer and thinner than normal,