Catterall classified the radiographic appearance of the femoral head in Legg-Calve-Perthes disease. The author is from Hospital for Sick Children in London.
Radiographic Appearance
Group
necrosis in the anterior aspect of the epiphysis only; no collapse and no bony sequestration is seen
I
larger area of necrosis in the anterior epiphysis; area of collapse with bony sequestration present; metaphysis may show cystic change anteriorly
II
anterior and most of the posterior epiphysis is involved; collapse with extensive bony sequestration; metaphyseal changes present; femoral neck may be broadened
III
total collapse of the epiphysis; significant deformity with flattening of the head; epiphysis may be displaced anteriorly or posteriorly; extensive metaphyseal changes
IV
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