My 12 year old son has osgood schlatter on both legs, and in June, as a result of x-rays, and a MRI was found to have a "subchronal irregularity" in his left knee porbably representing osteochondritis dessicans. No lose bodies, no fluids, or tears, probably a stage 1 lesion in situ. He stopped playing soccer for 8 weeks (althogh both orthopeadics said he could continue to play since the finding was asympomatic, by accident as a result of the x-rays). He never had KNEE pain, he still does not, other than for the osgood schlatter below the knee. A week ago he said that sometimes his left knee gives out, but he still has no pain. What could be the problem... someone told me it could be quadracept inhibition - bone growth faster than muscle strength??? Please advise.