Shoulder Impingement Syndrome (SIS): Signs and Symptoms
Repetitive Overhead Activity Scapular Dyskinesis
Note: It is important to distinguish SIS from RC tear and adhesive capsulitis (frozen shoulder). RC tears generally cause shoulder weakness. Adhesive capsulitis is associated with restricted active and passive glenohumeral motion.
Scapulohumeral mechanics become altered
Narrowing of subacromial space
Authors: Dalal Awwad Reviewers: Reza Ojaghi Usama Malik Aaron J. Bois* * MD at time of publication
Impingement of Impingement of underlying rotator subacromial bursa cuff (RC) muscle-tendon unit
Shoulder Impingement Syndrome
Rotator cuff disuse Muscle muscle atrophy Compression + Painful of on the arc test subacromial anterolateral bursa and acromion + Neer’s rotator cuff (i.e. supraspinatus and coracoacromial • sign ligament tendon) + Hawkin’s test Muscle weakness and Pain at 60-120 with Passive flexion of the shoulder Forward flexion of the shoulder to 90°, followed further alteration of passive shoulder while stabilizing the scapula by passive internal shoulder mechanics abduction reproduces the pain rotation reproduces pain