Neer, 1972, was the first to promote the concept that during internal rotation of the shoulder joint, pain is caused by impingement of the rostral arch and the anterior 1/3 of the acromion and rotator cuff tendons. 90% of rotator cuff injuries are caused by impingement. There are three types of rotator cuff patterns: flat, curved and hooked. The course of impingement is divided into 3 stages: I. subacromial edema and congestion II. rotator cuff tendonitis and tendon fibrosis III. subacromial spur formation and rotator cuff injury; early conservative treatment: mainly rest, avoid pain inducing shoulder movements, avoid violent exercises, physiotherapy, rotator cuff strength exercises, subacromial closure treatment. If conservative treatment is not effective, surgical treatment can be performed: minimally invasive shoulder arthroscopy with capsuloplasty.