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Table 1 Crowe classification [1]

From: Current concepts in developmental dysplasia of the hip and Total hip arthroplasty

TypeProximal displacementFemoral head subluxation
Crowe I<  10%<  50%
Crowe II10–15%50–75%
Crowe III15–20%75–100%
Crowe IV>  20%>  100%