A Comparison of the Long Term Effects of the Traditional and Modified Posterior Shoulder Stretching Exercise in Subacromial Impingement Syndrome

Inclusion Criteria: * Diagnosis of subacromial impingement syndrome * Glenohumeral internal rotation range of motion of the affected shoulder should be less than other shoulder and bilateral shoulder internal rotation range of motion difference should be ≥15 º * Pain with resisted arm elevation or external rotation as well as a minimum of 3 of 5 positive subacromial impingement syndrome tests, painful arc, pain or weakness with resisted external rotation, Neer, Hawkins and Jobe tests . * Ability to complete the entire study procedure Exclusion Criteria: * A 50% limitation of passive shoulder range of motion in \>2 planes of motion * Pain \>7/10 * A history of fracture to the shoulder girdle * Systemic musculoskeletal disease * History of shoulder surgery, * Glenohumeral instability (positive apprehension, relocation or positive sulcus test) or positive findings for a full thickness rotator cuff tear (positive lag sign, positive drop arm test, or marked weakness with shoulder external rotation)