I know of two ladies with each have a deformed leg from birth as they are now in their mid-sixties. When they were children they spent much of their time in hospitals undergoing several surgeries on their legs and one of the ladies has to swim every day in order to keep as strong and supple as possible otherwise without swimming the leg would definitly seize up!
The other lady has to use a stick to get around on her too, deformed leg, and although they are both afflicted with the same physical challenge, they have no relation to each other.
My point is: What are the causes of their leg deformites from their births? Thank you.