I second the chick vitamins that contain riboflavin (B2.) Feed and water the chick to keep up nutrition. Moistened feed and egg yolk can be helpful. An injury may be likely, but vitamins are helpful. It can be hard to tell what kind of leg problem there is. Slipped tendon, splay legs, or leg bone deformities are all common. It helps to see the chick’s legs while holding it up to stand, and without the vet wrap to see what may be going on. Sorry that your thread went unanswered for so long. Hopefully you can save the chick.