"If I were to have the operation, it would be quite a big procedure and the doctors said that if I did come back playing, I would be opening myself up to maybe some permanent damage and there is no guarantee it would work."
"So it's too much of a risk, especially in the position that I play in the front row. His advice was to retire and so I'm hanging up my boots. It still hasn't sunk in, but the surgeon has made the choice for me."
Williams signed for Cardiff Blues from Bridgend in the summer of 2003, having previously played for UWIC and Pontypridd and also the Sydney club, Gordon.
"Obviously I'm going to miss the game and the boys here, but life goes on after rugby and I have to think about my future now. I have a young family and that has helped put things into perspective."
"I have to find a real job now!" he laughed. "It's every rugby player's nightmare, but it has to come to an end sometime. I'm hoping I've done enough the last few years to be successful in the future away from rugby.
"I'd like to say good luck for the rest of the season to all the boys, Babs and Just, and hopefully this season or soon in the future we will see the Heineken Cup here at the Blues."
"Thanks again and snowboarding here I come!!!!!!!!!!!!!!!!"