I severed my acl, pcl and mcl simultaneously whilst on my trials bike. IM also a theatre nurse who works in orthopaedics. I wear the donjoy armour brace when i ride. Brace gives great protection to collateral and crucia ligaments. It gives me great confidence to ride as i wouldn't want to go through 3 knee reconstructions again. I would pay £120 and see an orthopaedic consultant privately. You will hop the queue quicker. Don't bother with glucosamine as there is no evidence to prove that taking it orally will get into your knee. Save your money.