I have been suffering from chronic knee pain for 10 years?

Ive seen a podiatrist and and orthapedic surgeon and all i learned was my right knee cap never fused and that I am suffering from old age......Im only 24...all this after 14 xrays. Anyway my knees hurt constantly and i can always feel this grinding sensation when i bend my leg and i cant do leg extensions cause i get sharp pain in the general area of my MCL. Anyone have an idea so I can save some money and not see five doctors this time?