Liesa,
I know exactly about being immobile due to joint problems. I have very bad osteo-arthritis. It was only diagnosed in July last year (but had probably been present for some time).
I spent 4 months on crutches during which time my weight stalled for a long time, and only started losing again when I managed to start walking again.
I am still in a lot of pain, and 90% convinced I need 1 x new hip and 1 x new knee ...... (orthopaedic surgeon would not make a decision back in October last year until after my gastric op) ...... so I currently have to put up with the pain and discomfort and very slow walking (as if I have rusty joints).
The only thing I can do at the moment (pre-op) to lose weight or keep my weight stable is monitor my calorie intake and fill up on lots of salad and soup !!!
Best wishes,
Sharon