Try the Strickland Protocol - http://www.strickland-protocol.com/ its been featured in Runners World (March 2013 I think) and a young athlete aged 14 was cured in 3 weeks. BUT you have to stop sports for 3 weeks - could be the hardest part!
If you go to the site, then click on the faecbook link, Jenny Strickland will answer your questions - she was lead physio at the London Olympics.
Runners World March 2013 have actually featured Osgood Schlatters. There is a clinically proven cure now called The Strickland Protocol. The 14 year old bot in the Runners World Article was cured during the third week of treatment.