Symptoms: Physical signs of injury, such as dragging wing, preference to perching on one leg. Leg hanging loosely.
Causes: Its never a great sight but this occurs from night scares, flying against the cage or aviary.
Treatment: There is not much you can do but rather try and get the bird off to a veterinarian if possible. Depending on the break the birds leg may able to be repaired. A splintmay be applied alowing the leg to rest and realign itself. Full repair can take anywhere between 1 to 2 weeks.
Pet Bird Care Us magazine, Common Finch Diseases: Aries Munandi, June 2015