Hypoplasia of the trochlea and the medial epicondyle of the humerus associated with ulnar neuropathy. Report of two cases.

Ulnar neuropathy in the region of the elbow is not uncommon, but its association with hypoplasia of the trochlea and the medial epicondyle of the humerus is extremely rare. Probably the earliest description of this association was that of Saito in 1927, but few details of the ulnar neuropathy were given in his report. In 1963 Abematsu, Miyashita and Aoki added three patients with a similar condition of which one had been operated on for ulnar neuropathy. They noted the variation in the course of the ulnar nerve at the elbow which was due to