Tubby tabby gets new knee joint at NCSU vet school

From the AP:

Because Cyrano weighs more than 20 pounds, amputating his cancer-weakened leg was out of the question. So the tubby tabby's owners turned to doctors and engineers at North Carolina State University to get him back into mice-catching trim.

On Thursday, the 10-year-old cat from Upperville, Va., received what doctors believe is the first feline total knee replacement in the U.S.

"This is the most complex implant that NC State has made and really, in all honesty, that anyone has built for any situation that I know of," said surgeon Denis Marcellin-Little, a French-born veterinarian.

Cyrano — his full name is Mr. Cyrano L. Catte II — underwent treatment last year at Colorado State University for cancer in his left hind leg. The disease is in remission, but the treatment left the leg nearly useless and extremely painful.

Marcellin-Little and NCSU engineer Ola Harrysson are pioneers in osseointegration, a process that fuses a prosthetic limb with living bone. In 2005, Marcellin-Little performed the world's first surgery to fuse leg implants with a cat's bone tissue, so Cyrano's owners turned to him for help.

Britain's Dr. Noel Fitzpatrick was credited with the world's first total knee replacement in 2009 on a cat named Missy, whose leg was crushed by a car. But Marcellin-Little said Cyrano's plastic and cobalt chromium alloy implant is more like those used in humans.

"It has a form of articulation that is unique — that allows the implant to bend and rotate," he said, demonstrating with a model during a news conference the day before the surgery. "The devil is in the details."

Such implants have become commonplace in dogs. But a cat's smaller anatomy has proved more difficult to work with, and Cyrano's damaged bones posed an additional challenge, Marcellin-Little said. ...