An analysis of the results of 53 patients treated by an open Neer decompression for chronic impingement of the shoulder is presented. Patients were evaluated pre- and post-operatively on the UCLA Shoulder Rating Scale, which includes an assessment of pain, function, range of motion, strength and patient satisfaction. After an average period of 27.3 months, good or excellent results were found in 81.1%. Satisfactory results (according to Neer) were found in 94.3%. Differential diagnosis of acromioclavicular pathology and cervical syndromes is important.