I was born with pffd in 1952.When I was a child doctors said that what I was born with was very rare and at that time there wasn't a name for it.When i'd be on my left knee the right foot would be flat on the floor.I had my foot amutated and they tried to strighten my femur that was bent and short but it didn't work. My knee on the pffd side as alwas been bent but when I was a child I could move it some but as I got older the knee fused its self together and my deformed hip has fused its self together.I don't know if this has anything to do with having pffd but so that you all will be on the look out I was also born with out my uterus and vagina (some thing else that's rare).I've lead a pretty normal life.Some one had asked on the site if any one with pffd was short I'm 4'11.