Surgery or Capsular Distention With Steroid in the Treatment of Primary Frozen Shoulder?

Inclusion Criteria: 1. The patient must have understood all information about the project and must have signed the informed consent letter about participation in the study including rehabilitation and follow-up 2. The patients must have a history and clinical findings typical for primary frozen shoulder with globally reduced range of motion in the shoulder. * External rotation 20 degrees or less * Abduction 45 degrees or less 3. The patients must not be in phase 1 (inflammation phase) 4. Diabetics may be included 5. MRI must be taken to exclude other reasons for stiffness Exclusion Criteria: 1. Other reasons for stiffness( cuff rupture, arthritis) 2. Posttraumatic or postoperative stiffness 3. Patients not suited for day surgery 4. Patients with a history of subacromial impingement before developing stiffness