That pain is the result of osteonecrosis-- also ... which sits directly inside the hip socket. "So now, instead of having a smooth, spherical shape to the end of that bone, allowing it to move ...

or ball to the ball and hip socket, So here's some cartilage here, but there's no cartilage there, that's basically raw bone and he's been walking on a surface of raw bone there and that's very ...

The congenital condition stops the ball and socket joints of the hip from developing properly. Without treatment, doctors say she would have grown up with worsening pain, limping and struggling ...