65% of shoulder pain attributed at least in part to impingement. The results of surgical impingement are actually comparable to those of conservative management. In the long term up to ⅓ of patients are left with persistent pain and disability.
As the am is moved away from the body, movement actually occurs between the clavicle and the breast bone. (sternoclavicular joint) clavicle and scapula and rib cage (scapulothoracic joint). The shoulder offers the greatest ROM of any joint in the body and is said to sacrifice stability for mobility.
There are 3 commonly described types of impingement: primary impingement, secondary impingement and internal impingement (Mullany and Stephen, 2014). Countless factors have influence on the development of an impingement in the shoulder: tendon trauma, tendon degeneration, bursal swelling and altered biomechanics in the shoulder joint.
Postural education and correction; regaining full range of movement and strengthening
Mullaney M.J. and Stephen N.J., 2014, Rehabilitation of Shoulder Impingement, Techniques in Shoulder & Elbow Surgery, 15(1), pp: 40-45