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proximal femoral focal deficiency
Proximal femoral focal deficiency (PFFD), also known as Congenital Femoral Deficiency (CFD),〔(【引用サイトリンク】website=paleyinstitute )〕 is a rare, non-hereditary birth defect that affects the pelvis, particularly the hip bone, and the proximal femur. The disorder may affect one side or both, with the hip being deformed and the leg shortened.
It is commonly linked with the absence or shortening of a leg bone (fibular hemimelia) and the absence of a kneecap. Other linked birth defects include the dislocation or instability of the joint between the femur and the kneecap, a shortened tibia or fibula, and foot deformities.
==Classifications==
There are typically four classes (or ''types'') of PFFD, ranging from class A to class D, as detailed by Aitken.〔http://gait.aidi.udel.edu/res695/homepage/pd_ortho/educate/clincase/pffd.htm〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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