Rowing machine might be a good idea, especially the ones that use 'proper' water and paddles in a tank. They are expensive to buy but some gyms and community facilities, if there are any left after Dave's cuts.
Thanks Mimi. I am actually quite heavy for my height, so I think I will try and lose some weight to see if it makes any difference.
My knees and hops dislocate - but not fully - and generally go straight back in but they have been doing it far more frequently and Ive been getting trapped nerves which are causing more pain than the dislocation itself. Think I will take a trip to the doctors and see what they say.
Gary - You're a mean mean man!
Russ - Ive tried rowing on a normal rowing machine in the past and as soon as I pushed back my knee popped out of joint, although I possible wasnt using it properly