The vast majority of pain felt in the knees is referred pain from the muscles above the knee. In particular the Quadriceps muscle group, on the front of your thighs, which are the largest, heaviest and most powerful muscles in the body. Trigger points in these muscles are the primary source of knee pain. Runners knee, growing pains in the legs of children, restless leg syndrome, locked knees, buckling hips, can all be traced to trigger points in the Quadriceps. Knee pain can be extremely debilitating, and yet is very easy to address.