"Hamada classification with Walch modification of rotator cuff tear arthropathy is made on AP shoulder views 1-4:"
"grade 1: acromiohumeral interval ≥6 mm; normal glenohumeral joint"
"grade 2: acromiohumeral interval ≤5 mm; normal glenohumeral joint"
"grade 3: acromiohumeral interval ≤5 mm, with acetabulization of acromion; normal glenohumeral joint"
"History and etymology"