I find this very interesting. I have had PRP injections for damaged ligaments of the spine. They take blood centrifuge the platelets out and inject them into the damaged tissue area. In a week it was though I never had a problem.
I believe that stem cells and growth hormones will be a main stream therapy (in a big way) very soon.
I would have tried the therapy you described in a heartbeat. The real upside beside the healing is that it is your own material being put back into your body, not a chemical.
Cheers