Table 3 Tönnis classification of osteoarthritis
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) |