Australian scientists are using stem cells to repair fractures in patients whose bones won't heal. The hope is it will save patients having to undergo many painful operations. Jamie Stevens, 21, fell off his motor bike nine months ago, fracturing his thigh bone. It didn't heal, leaving a five-centimetre gap. The usual treatment would be to graft a new bone from his hip. Instead, he was chosen as the first Australian patient to get an injection of specially treated stem cells. "The benefits outweigh the old procedure which takes a big chunk out of your hip," Jamie Stevens said. "It's...