Inclusion Criteria:  Subacromial impingement syndrome  Exclusion Criteria:  Ongoing claim with the Labour market insurance, insurance company or comparable institution. Ongoing application for job revalidation or health related pension. Radiating neck pain. Ultrasound verified complete rotator cuff tendon lesion, as defined by hypoechoic or anechoic full thickness defect of the tendon, or absence of the tendon. Periarthritis humeroscapularis. Acute luxation or fracture of the shoulder. Ongoing steady analgetic treatment of other concomitant painful condition, unrelated to the patients shoulder problem.