Some folks have done okay by wrapping the upper and lower parts of the leg, allowing it to bend at the joint. Vet wrap may be something to try, remember you must make sure that circulation is not at all inhibited. You might want to set up a sling to keep all weight off the leg for a while - make sure it allows room around the vent so that manure is not held against the little's body. Good nutrition is vital to healing, make sure you feed a good balanced ration - and I would add vitamins to the water once a week.
There is a poultry podiatry page on poultrypedia you might want to look at, also.
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