Quandry

I am in ..or have, a quandary!
Lucky me..do the local zoo know? I hear you ask.
I am to lose weight prior to surgery on my ankle. Only because the injury is so bad, I am unable to exercise much. Even swimming is painful, and when I give up because my ankle hurts too much, I can't get out of the pool. I just can't climb the ladder, so I have to pull myself out with my arms.
Am eating less, but as I am not as active, it isn't making as much difference. My daughter says I should try Pilate's, as it should help.
If anyone knows any exercise that can be done safely with an injured ankle, I'd love to know.