Previous to the use of the X-rays for diagnostic purposes, fracture of the lower end of the ulna was considered extremely rare. Fractures of the ulna above the head resemble practically those of the shaft.

Fracture of the styloid process was observed by D. H. Agnew in one case which was followed by deformity. Inasmuch as the deep fascia slides over the ulna it is readily seen that if it is perforated one or other of the fragments may be caught in the rent. This is probably the explanation of the deformity which occurred in Agnew's case. He advised treatment with the hand bent toward the ulnar side to relax the extensor carpi ulnaris tendon. Fracture of the styloid process of the ulna has been shown by the X-rays to be a more frequent accompaniment of Colles's fracture than was formerly thought to be the case, - it tends to favor displacement of the hand toward the radial side.