Arthrogryposis is a syndrome of multiple joint contracture and subluxation that is present at birth and is characterized by a nonprogressive disorder. Patients with lack of active elbow motion show the typical elbow motion with passive assistance, such as the trunk-sway and cross-arm techniques. We describe our experience with the treatment of an arthrogryposis patient with cubital tunnel syndrome caused by the passive elbow motion. The ulnar nerve was entrapped by a thick fibrous band at the cubital tunnel, and simple decompression of the ulnar nerve brought the patient a good recovery from the palsy.
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