Proximal - nearest point to centre or to point of attachment.

Femoral - the thigh bone (the longest and strongest bone in the body - extending from the pelvis to the knee).

Focal - focus or starting point.

Deficiency - lack or shortage; less than necessary.

Levels of PFFD vary:

• a shorter femur (can vary in length)
• hip joint is also affected or may be absent
• one or both legs may be affected
• varying effects on the foot

Solutions that may be recommended:

• an extension prosthesis
• amputation of the foot in a Symes amputation giving the function of an above-knee amputation
• a rotationplasty procedure providing similar function to a below-knee amputation
• limb-lengthening (length of the femur, condition of the hip and knee are factors in determining if limb-lengthening is feasible)

• Amputation Levels
• Rotationplasty (Van Nes Rotation) 
• PFFD / Proximal Femoral Focal Deficiency