By SIMON THOMAS

Bionic: Joe Roberts in action against England
PICTURE: Alamy

JOE Roberts is Welsh rugby’s answer to the Bionic Man having received a bone transplant from a mystery American donor.
After making a try-scoring Six Nations debut against France in March, the Scarlets centre had to undergo major surgery to rectify a serious knee problem.
“I had a hole in the bottom of my femur where it came into my knee,” he explains.
“I think it was wear and tear, a build-up from when I did my cruciate ligament a few years ago.
“So, I had to get a b...