The snapping scapula in association with the thoracic outlet syndrome.

Thirteen of 100 patients treated for thoracic outlet syndrome by first-rib resection postoperatively developed an associated painful superior angle of the scapula, or snapping scapula syndrome. The scapula angle was painful in 15 scapulas and the pain persisted in these 13 patients. Resection of the superior angle of the scapula was performed on 9 patients (11 snapping scapulas) with complete relief of symptoms. We propose that snapping scapula syndrome be considered a causative factor for apparent failure of thoracic outlet surgery.