I purchased this 4 my left knee, which is bone on bone. I had a stroke in 2014 & am disabled, I recently needed more support 4 my left leg/knee, especially going up stairs. I really like the way it feels on my leg & the leg/knee support. The only down side is how difficult it is 2 put on, especially with only 1 working hand (Since the stroke, my left hand is pretty useless). I still manage 2 struggle it up onto my leg.