i paly a lot of gaelic football, about 5-6 times a week, a couple of years i started having problems with my left knee, its a pain that never goes away but flares up at times, i had physio and doctor checkups, physio said it was a strained tendon and rest should clear it up it didn't, doctor sent me for an x-ray, but it came back clear. Any ideas as to how i might get rid of this?