I haven't shared this with anyone yet, but a few weeks ago I found a duckling that the geese or drakes got a hold of and it had a nasty, open (bone sticking out) fracture of it's tibia. It was filthy, so I cleaned it he best I I could, trimmed some of bone off and splinted it straight, like you would with a human leg, but that didn't work, so ended up taping the leg and foot up against it's body and left it like that for about 10 days. After ten days I unwrapped it and noticed the foot was starting to curl and the hock joint was stiff, but I figured there weren't too many options, so I re-taped it. Not sure how long I kept it taped, maybe a total of 4 weeks, but keeping it like that the bone did heal, albeit crooked, lol. Anyway, when I removed the tape the foot was curled and she had range of motion in her hock was next to nothing, but after about a week she was almost 100% normal.
Guess what I'm trying to say is that I think a duck sitting still in one place will eventually recover if the bones can heal.
Awesome K thanks for the encouragement, and ideas, what do you think of the sling option?