All: Thanks for the encouragement. An MRI has already been done, what is next is an MRI in which they inject a dye which will tell them what is torn and how much. The surgeon told us not to jump to conclusions but in his opinion, without seeing the new pictures (which are delayed until next Friday) he expects to see a tear.
He is 6'-4" and 187 and still growing as he is 15. According to the surgeon, that can not be the cause, but couple that big lever, with the younger age and the imperfect mechanis it all plays a part. He had an 8 year old two weeks ago that suffered a torn ligament as well