Mate,
Every year, I go in for my HA knee injections. Plus i take 5 grams of MSM daily.
Don't care what anyone says, for me, squats and deads are horrible for my knees. Went to inshape two months ago, went to do a squat with a real light weight (100lbs). did about two sets, and uh-oh. It's been three weeks since my knee surgery. Recovering great. But the squat was the straw that broke the camels back for me.