AC Shear Test is used to stress the acromioclavicular joint and a positive test can indicate an acromioclavicular joint ligament sprain.
Patient seated, examiner cups hands over clavicle and spine of scapula and then proceeds to apply a compressive force through the AC joint.
Test may be modified to stress the coracoacromial ligaments.
- Patient is side lying on unaffected side.
- Examiner stabilises the clavicle and pulls the inferior angle of scapula away from chest wall.
- Procedure is then repeated with examiner pulling the medial border of the scapula away from the chest wall.
Positive AC Shear Test
Pain or abnormal movement: Acromioclavicular joint pathology, AC ligament sprain.