Okay, I'm not sure who he is or who Cole is or what kind of surgery was done. But don't be so quick to jump to conclusions. There could very well be a logical explanation. Metal is often left in knees, I have lots of it. None of it causes any problems. How did the radiologist come to the conclusion that there were metal shavings? I've seen my MRI with a screw in there and all it shows is a black blotch.
That being said, if there are indeed metal shavings the only remedy is to surgically remove them. When I had my PKR a piece of the jig broke off in my knee. Makes for good conversation when I show people my x-ray but it hasn't caused any problems.