Cubital tunnel syndrome is characterized by sensory and/or motor deficiencies of the ulnar nerve. It is the second most common compression syndrome affecting a peripheral nerve, exceeded in prevalence only by carpal tunnel syndrome. Cubital tunnel syndrome occurs at the elbow, where the ulnar nerve passes posterior to the medial epicondyle and beneath the arcuate or Osborne ligament and distal and proximal to the retrocondylar fossa. The syndrome is assumed to be caused by compression that may have one or multiple foci, but the exact cause of the pathology remains unknown. The cause may be traction on the nerve from repetitive or prolonged flexion of the elbow or a combination of traction and compression.