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Tonnis osteoarthritis grades.
| Grade | Symptoms | |
|---|---|---|
| Grade 0 | No signs of osteoarthritis | |
| Grade 1 | Slight narrowing of the joint space. Slight sclerosis of femoral head or acetabulum and slight lipping at the joint margin. | |
| Grade 2 | Small cysts, less than 50% joint-space narrowing, moderate loss of femoral head sphericity. | |
| Grade 3 | Large cysts, severe narrowing or no joint space, severe deformity of the femoral head and avascular necrosis. | |
