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Table 2 Simplified Binary Tönnis Classification

From: Binary Tönnis classification: simplified modification demonstrates better inter- and intra-observer reliability as well as agreement in surgical management of hip pathology

Classification Description
Grade 0 - No or minimal joint space narrowing
- No or slight osteophytes
- No or slight sclerosis
Grade I - Joint space narrowing
- Loss of head sphericity
- Cysts development
- Avascular necrosis