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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