Tönnis Classification of Osteoarthritis by Radiographic Changes

0 No signs of osteoarthritis
1 Mild: Increased sclerosis, slight narrowing of the joint space, no or slight loss of head sphericity
2 Moderate: Small cysts, moderate narrowing of the joint space, moderate loss of head sphericity
3 Severe: Large cysts, severe narrowing or obliteration of the joint space, severe deformity of the head
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