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Compressive ulnar neuropathies at the elbow: I. Etiology and diagnosis

New York University School of Medicine, New York, NY and New York University Medical Center/Hospital for Joint Diseases Department of Orthopaedic Surgery and Lenox Hill Hospital, New York, USA.

Ulnar nerve compression at the elbow can occur at any of five sites that begin proximally at the arcade of Struthers and end distally where the nerve exits the flexor carpi ulnaris muscle in the forearm. Compression occurs most commonly at two sites-the epicondylar groove and the point where the nerve passes between the two heads of the flexor carpi ulnaris muscle (i.e., the true cubital tunnel). The differential diagnosis of ulnar neuropathies at the elbow includes lesions that cause additional proximal or distal nerve compression and systemic metabolic disorders. A complete history and a thorough physical examination are essential first steps in establishing a correct diagnosis. Electrodiagnostic studies may be useful, especially when the site of compression cannot be determined by physical examination, when compression may be at multiple levels, and when there are systemic and metabolic problems.