@LFitz,
Thank you, you are very kind. I saw my surgeon today, the physio had told him what happened. He checked out my knee very thoroughly. The good news is the implant is fine, but I have strained some ligaments. He pushed down on my knee and got it much straighter, (it hurt, but I forgave him, he's lovely, great bedside manner) and he said my quad muscles are firing, just not very strong yet. He said I am starting to make scar tissue because I am healing quickly and he showed me how to massage it to help it disperse. He was not at all disappointed with the flexion, though it's only about 75. He did mention the dreaded M word, but not in a threatening way. We are aiming for 90 by twelve weeks.
Apparently I did have a lot of chronic inflammation in the joint lining so the surgeon had to do a synovectomy, and this might make my recovery take a bit longer.
He's referring me to a pain specialist, I've got an appointment with her this Friday.
All in all I was very reassured today. It's good to know that the implants are so trustworthy. Moral of the story, if you do fall don't panic, tell your OS, and be careful in the bathroom

Love to all,
Tabby xxx