I wonder if it's spraddle leg here is info on it and how to hobble
I'd also get some B complex liquid and give it to this duckling, it can also help with leg issues. This info is taken from the link I gave you did you read it?
Leg Hobbles to treat Splayed Leg
** Splayed Leg needs to be treated ASAP and consistently!
CAUTIONS for treatment: A young chick wearing Leg Hobbles can't get up easily or stand easily. It can fall & drown if it stumbles near a water container. See "Prevent Drowning in Water Dish" section.
KEEP IN MIND: You need to help a chick daily by gently scratching itchy spots that the Leg Hobbles prevent it from reaching with its feet. If you don't scratch places for the chick like the back of its neck where it cannot scratch itself, it will be pretty miserable and can develop a terribly itchy, swollen welt from lack of normal skin stimulation.
Splayed Leg (also called "Splay Leg", "Spraddle Leg", and "Straddle Leg") occurs when a newborn chick younger than a week old is having trouble learning to stand and walking. While experimenting, the chick starts rotating one or both legs outwards at an incorrect angle. The chick rotates the leg so that foot points mostly to the side instead of forwards, and the chick often becomes sort of "knock-kneed" because the hock on the rotated leg almost touches the other hock. This leg problem may look like a birth defect or deformity, but often it is not to begin with.
Photos of a chick with one form of Splayed Leg
The rotated foot slips a lot when the chick tries to use it that way, so the chick will shift most of its weight onto the other straighter leg & mostly use that to support itself while standing, hopping along, or pushing itself along the ground. The chick may also push a wing out against the ground to help balance itself.
The chick usually shows problems in only one leg at first (the most rotated leg), but the straighter leg will also become deformed over time.
- VERY, VERY IMPORTANT: Check your bird to see if it also is suffering from Perosis (which can relate to nutritional deficiencies) and a Slipped Achilles Tendon.
