Catterall classification of Perthes disease
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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
-<li>changes are visible best in <a href="/articles/frog-leg-lateral-view">frog leg lateral view</a>- +<li>changes are visible best in <a href="/articles/hip-frog-leg-lateral-view">frog leg lateral view</a>
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