"In a new development internationally, the recipient's hand was removed at the same operation as the donor hand was transplanted," the release states. "This allowed very accurate restoration of nerve structures."
A week after the procedure, Cahill can already wiggle the fingers on his still bandaged hand, which does not yet have a sense of touch.
"When I look at it and move it, it just feels like my hand," Cahill tells the BBC (click the link to see a video of him and surgeon Simon Kay, or watch the video below from the Telegraph). "Right now it feels really good, it's not a lot of pain, it looks good, it looks a great match and I'm looking forward to getting it working now."
Cahill required the procedure because an old case of gout had paralyzed his paw.
The first ever hand transplant was in 1998 in France, performed on New Zealander Clint Hallam, the victim of a circular saw about 10 years earlier. There have been some 60 transplants since then, all involving people without a full set of mitts.