There really are not a lot of options if it were a leg deformity. Slipped tendon is one of the more common ones, while there are others such as tibial dyschondroplasia and rotated or twisted tibia. Slipped tendon sometimes can be treated successfully as a day old, but rarely afterward. A sprain or broken leg would have a better chance of getting better, but breaks high in the femur do poorly. Let's hope it is a vitamin deficiency, since that has better odds. Here are some links on bone deformities to read:
https://sites.google.com/a/poultrypedia.com/poultrypedia/poultry-podiatry
http://nhjy.hzau.edu.cn/kech/synkx/dong/2bao/Bone disorders in poultry.pdf
http://www.merckmanuals.com/vet/pou...nfectious_skeletal_disorders_in_broilers.html
https://aaap.memberclicks.net/assets/musculoskeletal preview.pdf
https://sites.google.com/a/poultrypedia.com/poultrypedia/poultry-podiatry
http://nhjy.hzau.edu.cn/kech/synkx/dong/2bao/Bone disorders in poultry.pdf
http://www.merckmanuals.com/vet/pou...nfectious_skeletal_disorders_in_broilers.html
https://aaap.memberclicks.net/assets/musculoskeletal preview.pdf
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