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Table 3 Tönnis classification of osteoarthritis

From: Functional improvement in hip pathology is related to improvement in anxiety, depression, and pain catastrophizing: an intricate link between physical and mental well-being

Grade Description Patients, n (%)
0 No signs of osteoarthritis 45 (22.4)
1 Mild: increased sclerosis, slight narrowing of the joint space, no or slight loss of head sphericity 36 (17.9)
2 Moderate: small cysts, moderate narrowing of the joint space, moderate loss of head sphericity 21 (10.4)
3 Severe: large cysts, severe narrowing or obliteration of the joint space, severe deformity of the head 99 (49.3)