The necessary and sufficient criteria for the diagnosis of subacromial abrasion are:
- Limited function with arm in intermediate positions of elevation
B. Physical examination
- Subacromial crepitance which reproduces the function-limiting symptoms" particularly on rotation of the humerus with the arm in intermediate positions of elevations
- Diagnosis is supported by primary or secondary changes on the undersurface of the coracoacromial arch such as acromial sclerosis or a traction spur in coracoacromial ligament
- Diagnosis is supported by the coexistence of incomplete thickness cuff lesion or full thickness rotator cuff tear.