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Table 1 Crowe classification [1]

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

Type

Proximal displacement

Femoral head subluxation

Crowe I

<  10%

<  50%

Crowe II

10–15%

50–75%

Crowe III

15–20%

75–100%

Crowe IV

>  20%

>  100%