Here's my orthopedist's formal diagnosis
http://en.wikipedia.org/wiki/Iliotibial_band_syndrome A muscle in my hip, attached to a tendon that wraps around the back of my leg and aligns my kneecap, is inflamed and filled with scar tissue where Devon clubbed it with a skateboard in January. Interestingly, my physical therapist advised that I not wear a knee brace, saying a knee brace would actually hold my kneecap out of alignment.