Hi, I am a 23 y/o female who is active and healthy weight. I am a runner, and I go to specialty running stores to get custom orthotics and shoes, which I replace about once every 6-8 months. I had a previous problem with my knee that neither a Sports Medicine doc or rheumatologist could explain. The other day I was out on a run, and it was rather cold. I noticed that, although my movement of my right leg is normally less than 100%, I couldn't extend my leg. I had severe pain in my lower back, hip and knee, as well as sharp pain in my first metatarsal. Google informs me that my symptoms point to trochanteric bursitis, but I can't see how that would explain the pain lower in the leg. I have also had small (1/2" diameter) unexplained bruises around the knee joint and foot.