after 8 months after my first tkr, im still not walking, and the muscles are weak and keep buckling when i try to walk. im still in pain, feels like bee stings all over the knees. my arms are weak, cant lift the kettle or the milk out of the fridge .... have decided ive had enough of waiting to recover, i joined the gym thinking this would strenghthen the weak muscles around the knee but after months of working hard to help myself im just in more pain and getting weaker. yesterday i rung the hospital and he asked me if im allergic to nickel. YES i am. i did tell him this 8 months ago before i had the surgery it seems the metal in the new knees is cobalt, that has small amounts of nickel in it. so, the upshot after a blood test next week it looks like i have to go through it all again! i would love to hear from anyone that has been through this....... i could cry.