fig1

Figure 1. (a) There are five possible areas of ulnar nerve compression at the elbow level. (1): Arcade of Struthers; (2): proximal epitrochlear region; (3): epitrochlear-olecranon channel; and (4): fibrous arch between the humeral and ulnar parts of the flexor carpi ulnaris (FCU), better known as Osborne's arcade; (b) the figure shows the opening of Osborne's arcade (4) with the release of the septum between the ulnar part of the FCU and the flexor-pronator group (5). (1), (2) and (3) indicate the release of the other areas of decompression