Neurologic complications of surgery for anterior shoulder instability.

Two-hundred eighty-two patients underwent anterior reconstruction for recurrent glenohumeral instability between 1981 and 1991. Twenty-three patients (8.2%) had a neurologic deficit after surgery. Seven had sensory disturbances only; 16 had sensorimotor neuropathies (8 having multiple deficits designated as a diffuse plexopathy and 8 having a more defined deficit in 1 or 2 cords or peripheral nerves). Complete resolution occurred in 18 of the 23 patients. Four patients had a residual deficit (1 patient was lost to follow-up). Three had persistent sensory disturbances; 1 had permanent biceps weakness. None of these patients underwent surgical exploration. Older age (P = .045) and a Bankart lesion (P = .029) were associated with a neurologic complication. At an average follow-up of 8.7 years, 252 patients responded to a questionnaire regarding shoulder outcome, including 20 of the 23 patients with nerve injuries. The difference in the median Rowe score of those with and without nerve injury was not significant (P = .072). Neurologic injuries after anterior shoulder surgery presumably arise as a result of traction. The prognosis for neurologic recovery is generally good. Neurologic injury did not interfere with the outcome of the stabilization procedure.