[i]Originally posted by mike[/i]
It definitely sounds like a "locked up" or adhesed lumbo-pelvic-hip complex. The giveaways are the medial movement of the thigh during swing and the eversion of the foot at toe-off. HPC can definitely look at this quantitatively but to be perfectly honest unless you're interested in confirming what you see with numbers I think the most benefit would come from something hands-on in the form of a qualified coach or physiotherapist so the exact source of the problem could be properly identified. HPC can certainly do this if you're interested but it might be easier for you to find a local soft tissue therapist. Where are you located?
Mike-Thanks for your advice. We are 3 hours from Minneapolis. We had a physical therapist who is the trainer for a local high school view a digital cam with freeze frames and slow motion of our son's running form. He also examined our son. He believes it is related to excessive tightness(or lack of sufficient flexibility of lower lumbar spine torsion), as well as some tightness of the hip capsule, particularly on the left for both areas. Interestingly, our son is left handed, and jumps L-L-R, and he is perhaps stronger on the left. We're working on improving flexibility. If we don't see some progress in 1-2 months, perhaps we'll come down and see you. Thanks