Oh boy I am so very sorry to hear about your knee. I hurt mine some time ago and it has effected my productivity with my quilting and hosting swaps. (One swap I did with a cane and a knee brace!) I ended up having to buy one of those petal lifts from sewing with nancy to keep from blowing it out every time I was sewing! It really did work to help just in case you are interested. My knee isn't completely back to normal, but, I am able to sew with out being in so much pain.