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From the case:
Legg-Calve-Perthes disease - Catterall classification
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The Catterall classification for Legg-Calvé-Perthes disease is based on radiographic appearances and is as follows:
- Group I: involvement of the anterior epiphysis only
- Group II: involvement of the anterior epiphysis with a clear sequestrum
- Group III: only a small part of the epiphysis is not involved
- Group IV: total head involvement
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