The Constant score is used as a primary outcome measure. The Constant score is measured from each patient right before treatment intervention and at three and six months, one, two and five years after the intervention. The intervention groups are designed in a cumulative fashion: structured and standardized physiotherapy treatment proceeds gradually in all patients (groups 1,2,3), in addition to physiotherapy patients in group 2 are treated with acromioplasty, and patients in group 3 with acromioplasty and rotator cuff reconstruction.