Introduction Shoulder impingement syndrome (SIS) is the mechanical entrapment of the supraspinatus tendon underneath the acromial arch of scapula. The narrowing of the subacromial space (SAS) was ...

Common symptoms of impingement: 1. Generally, no pain when your shoulder is at rest. 2. Pain and weakness occur with reaching forward, to the side, or behind your back. 3. Over time the pain and ...