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Hamada Classification of Arthritis in chronic rotator cuff tears (Hamada K, CORR 1990;254:92).
- Stage 1: Acromiohumeral interval greater than 6 mm.
- Stage 2: Acromiohumeral interval less than 7 mm.
- Stage 3: Acromiohumeral interval less than 7 mm with acetabulization of acromion.
- Stage 4a: Acromiohumeral interval less than 7 mm with glenohumeral arthritis without acetabulization.
- Stage 4b: Acromiohumeral interval less than 7 mm with acetabulization and glenohumeral arthritis.
- Stage 5: Acromiohumeral interval less than 7 mm with osteonecrosis of humeral head.
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