Catterall classification of Legg-Calvé-Perthes disease

The Catterall classification is based on radiographic appearances of the epiphysis and metaphysis visible in osteonecrosis of the femoral head:

Stage I
  • bone absorption changes visible in the anterior aspect of the epiphysis of femoral head
  • changes are visible best in frog leg lateral view
  • no sclerosis is seen
Stage II
  • further bone resorption with slight femoral head collapse in the anterior aspect of femoral head
  • sclerosis
Stage III
  • almost entire femoral head involved in collapse with characteristic head within head appearance
  • sclerosis
Stage IV
  • complete collapse of femoral head with flattening and formation of dense sclerosis; additional metaphyseal changes may be visible
  • sclerosis
  • posterior remodelling
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Article information

rID: 43450
Tag: avn
Synonyms or Alternate Spellings:
  • Catterall classification
  • Cateral classification
  • Catteral classification

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    Figure 1: Catterall classification
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