The hip bone connects to the knee bone...
This is an excerpt from Physical Therapy is Vital to Joint Injury Treatment by Kevin R. Stone, M.D. Orthopedic surgeon.
Remember those song lyrics "The knee bone's connected to the thigh bone, the thigh bone's connected to the hip bone"?
It's actually a good anatomical reminder about the importance of seeing an injured or arthritic joint as part of your whole body and not something to be treated in isolation. If you are limping or favoring a joint, more than likely other parts of your body are off as well. The whole body is connected in one way or another.
The joined-up skeleton is the reason why physical therapy is so important to the recovery process. -excerpted from Huffington Post