Ok, so, if I'm understanding this right, it sits back on its rump and hocks most of the time, and when it tries to walk, its legs go out behind and to the sides of it?
There are some vitamin deficiencies that cause spraddling as well as some genetic traits but I don't know which one it is, so best to treat with vitamins and see if that fixes it, and if it doesn't, well by the virtue of having eliminated one possibility we'll have a better idea. Most people seem to use Polyvisol or something like that, I don't know, I've never had that problem because I feed the parents kelp. I have had genetic spraddling but that fixes itself.
It may be best to treat the sores on the hocks and restrain the bub to a small area where it can stand and reach food and water, but not spend time in the wrong position. The longer it spends time in the wrong position, the more the body adapts to that, stretching muscles and tendons into the incorrect positions which can cause secondary injuries which can be altogether too hard to treat. Some people with spraddling ducklings put them into small, shallow teacups so they can get their legs under them and not end up flat out or on their backs. What you use depends on what works I guess.
Best wishes.
