Best Physiotherapy Clinic for Rotator cuff Injury in Gurgaon PAL Physiotherapy Rotator cuff injuries affect the muscles around the shoulder joint. Individuals with rotator cuff injuries may experience a dull ache in the shoulder. This pain may become worse if you try to sleep on the affected side. Rotator cuff injuries may lead to weakness in the arms and difficulty to perform activities like combing hair or reaching behind the back.