This is caused by and inflammation within the shoulder joint set up, specifically in two different parts of the rotator cuff, the Bursa and the cuff Tendons. This is because the shoulder joint allows for the greatest range of motion of any joints, therefore it needs to be very shallow and open to allow for this to happen. Shoulder Impingement - What it is and How to Treat It Shoulder Impingement is a very com shoulder joint disorder, medically known as Impingement Syndrome. This is the background for the onset of different conditions, including Shoulder Impingement. Firstly, the rotator cuff is a comprehensive name for the 4 muscles and tendons that make it up. The 4 muscles, Supraspinatus, Infraspinatus, Teres Minor and Subscapularis, insert in different parts of the shoulder blade and converge into the arm bone, the humerus, around the humeral head ball, embracing it and keeping it into the Glenoid socket, thus preventing dislocation at every movement.

It owes its name to the clicking, popping feeling in the shoulder affected, whenever an over head movement is attempted.