I have pain along the bone on the inside of my leg, from about two inches above the bony knob on the ankle to the bony knob. The pain is toward the back of leg, but definitely on the side rather than the back and definitely along the bone. It is sore to the touch. Is this likely Posterior Tibial Tendonitis? I can still run with it. It just hurts later. I've been running in vff's for about 18 months but have recently increased mileage training for a marathon in 5 weeks. Advice?