proximal femoral focal deficiency

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prox·i·mal fem·o·ral fo·cal de·fi·cien·cy (PFFD),

a congenital defect in which variable portions of the superior end of the femur are reduced or absent.
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18) Marked retroversion has been observed in hip dysplasia with proximal femoral focal deficiency (PFFD), (19) in posttraumatic dysplasias, (20) and more importantly after reorientation procedures, such as Salter osteotomies in childhood.
Her rare condition, proximal femoral focal deficiency - said to affect just one in a million people - meant her knee was where her hip should be, her shin replaced her thigh and her ankle acted as a knee joint.
2) They reported on 17 resurfacing arthroplasties performed in patients with femoral deformities caused by trauma, renal osteodystrophy, proximal femoral focal deficiency, multiple epiphyseal dysplasia, and retained hardware.

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