At 10 years old, X-Rays.
Ryder at 3 had a limp, in fact has a recurring limp, and when he was in for a dental at around 4, I got x-rays done and they didn't show anything, so I was cleared to use a chiropractor. The chiro has done incredible wonders for Ryder, so I would suggest, if the x-rays turn out to be clear - you could start going to a chiro to seek some relief. I wouldn't have believed how successful it can be if I never seen it with my own eyes. Alternatively, or combined really, consider using some joint supplements. They helped both my boys when they started receiving it regularly. Those are my thoughts and I wish you all the best.
Good luck Jackie!