3 years before had blunt hit on left knee patella in road traffic accident , Had pain and locked knee then ,, MRI then showed partial thickness tear of acl, Done with three consecutive MRIs after a gap of every 6 months each which showed normal MRI showing with everything normal, Now having continuous knee pain past four months which Normalises when I apply hot water , x ray done now showed Reduced joint gap in the left side of left knee , What should I do ??? Please help!!!