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If I stayed a football player, my career would have been over 20 years ago. As it is, my knees are shot. I found I got the same good feeling in acting that I had in sports, but I found I could have a more profound impact on people.

Having a normal knee would make life a lot easier.

To have any doubt in your body is the biggest weakness an athlete can have. There are times when I physically can't get myself to go for a skill because I'm thinking, 'My knee hurts really bad.'

I've decided to listen to my doctors and get the procedure I need on my knee. USA Basketball said I had to do what was best for me. They want me to be obviously as healthy as possible so I can continue to play this game at a high level.

My good health, coupled with joy of tobogganing and my desire to be the best, has helped me stay in professional sport for so long.

I'm fine, and my hips are fine. My false knee is fine. My false hips are fine. Everything's cooking.

If my leg falls off, I'll get a prosthetic. There'd be no deep sadness about. I'd just get on with it! It's called life, and I love life. You have to be positive, and you have to crack on no matter what.

The thing is I have no ACL. So unless I get surgery, there's nothing really magical that I can do that's going to make it better. I just can get my leg stronger, my muscle stronger and try and support it a little more. But that has a small impact. My knee is loose, and it's not stable, and that's the way it's going to be from here on out.