I know how you feel, my fingers get so stiff when I bind,my arthritis also kicks in. I try and keep my fingers moving but I pay for it. I may have to have my right knee replaced soon, Dr says it gone?? Will wait & see for sure.
So sorry to hear about your knee. I know that surgery can be kinda of tough, but on the bright side you can get alot of projects done while your recouping.