The case histories of 91 patients (54 male, 37 female) with proximal femoral focal deficiency identified measurements which allow the physician to predict ultimate growth and pelvo-femoral ...

Ollie has Proximal Femoral Focal Deficiency (PFFD), a congenital condition that he said, "basically means that I don't have a hip and I'm also missing one of the bones in the lower part of my leg".