Cheers Helly Medic , I did hope you would you would reply at some stage but didn't want to bother you with a messge .
This is what they did
" Exploration and debridement of laceration left knee( no communication with the joint) "
I took that to mean washing it out
It would appear that the wound did
not enter the joint then and is 'just a flesh wound'.
These things do take a while and are slower on the 'outside' of a joint (front of the knee, back of the hand) than on the 'inside'.
I have never personally had any surgical wound and can't really comment on how these things behave as the nature of doctors is to see these wounds when they're fresh and then only fleetingly afterwards, only getting concerned if there are signs of infection or other complications.
I think you'll just have to wait, or see your GP if another fortnight passes without improvement.