Indications

AC Shear Test is used to stress the acromioclavicular joint and a positive test can indicate an acromioclavicular joint ligament sprain.


Procedure

    Patient seated, examiner cups hands over clavicle and spine of scapula and then proceeds to apply a compressive force through the AC joint.
Acromioclavicular Shear Test

Examiner applies compressive force through the AC joint.

Modifications

Test may be modified to stress the coracoacromial ligaments.

  1. Patient is side lying on unaffected side.
  2. Examiner stabilises the clavicle and pulls the inferior angle of scapula away from chest wall.
  3. Procedure is then repeated with examiner pulling the medial border of the scapula away from the chest wall.

Interpretation

Positive AC Shear Test

    Pain or abnormal movement: Acromioclavicular joint pathology, AC ligament sprain.