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Table 2 Hartofilakidis classification [5]

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

Congenital hip diseasesDescriptionSubtypes
DysplasiaThe femoral head is contained within the original acetabulum despite the degree of subluxation or proximal femoral migrationA
Low dislocationThe femoral head articulates with a false acetabulum that partially covers the true acetabulum to varying degreesB1
The false acetabulum covers more than 50% of the true acetabulum; resembling dysplasia
B2
The false acetabulum covers less than 50% of the true acetabulum; resembling high dislocation
High dislocationThe femoral head is completely out of the true acetabulum and migrated superiorly and posteriorly to varying degreesC1
The femoral head articulates with a false acetabulum
C2
No false acetabulum; the femoral head is free-floating within the gluteal musculature