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Table 1 Gächter Joint-infection classification

From: Posttraumatic severe infection of the ankle joint - long term results of the treatment with resection arthrodesis in 133 cases

Gächter Stage Clinical Aspect
I Hyperaemia of synovia, effusion
II Hypertrophia of synovia/pus
III Beginning cartilage damage, no radiological destruction
IV Radiological visible changes to bony structures, synovia grows over the cartillage