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Table 1 Traditional 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

Tönnis Grade

Description

Grade 0

- No signs of osteoarthritis

Grade I

- Sclerosis of the joint with minimal joint space narrowing and osteophyte formation

Grade II

- Small cysts development with moderate joint space narrowing

Grade III

- Advanced arthritis with large cysts, joint space

- Joint space obliteration, severe deformation of the femoral head