This is Missy the world’s first cat to receive a knee replacement. She was close to death after being run over by a car but after receiving pioneering surgery to rebuild her limbs and being fitted with a metal joint she is now recovering nicely. To repair her leg a collagen mesh made from a pigs bladder was used to re-grow tissue and cover the bone. The bones were then placed in a device called a spider which held them in place until the bone and tissue had healed. The implant itself was custom made to fit Missy’s measurements. It was made out of stainless steel and bonded to the thigh bone and shin bone using cement. The new implant should allow Missy to walk, run and jump around as normal.