Emergency! Please can anyone help?

Was at the barn where I board my horse.  This Toulouse  gosling is about a week and a half.  Its poor leg is turned in and the back part of the knee joint is a bit swollen.  It can't walk, but is eating, drinking and being quite chipper despite it's leg. It can only kind of drag itself.  It shows no signs of pain when you touch or move it leg.  They have been moving the leg around several time a day for physical therapy.  The Mother has abandoned it and it is the only gosling on the property.  What can we do for its leg?  Please help. I want to help it before it's too late. I am taking over a carrier and some soft bedding and a snuggle toy for it.  At least it will be safe and comfortable.

I believe it has been this way since hatch.

Thank you.  Since it is not mine I do not want to overstep, but the Mother has nothing to do with it and neither do the other geese.  It's the only gosling on the property.  I am heading there tomorrow to help.  I am going to make an ortapedic chir for it to see it it helps.  I have also mixed some fresh greens,veggies, and I added crushed up brewers yeast.  I am alos going to try the splint idea and see what happens.  i will let you know what happens.

I do have a special built goose pen for the goose I used to have.  I will ask the owners if they would let me take it. I have never seen this before.

thank you.  It appears as if it'sentire leg turns inward starting with the femur, then the thigh joint, and tibia.  It's shank goes directly under it's body and faces it opposite leg.  It can't walk.  I am wondering if putting it in a tub with some warm water to take the pressure off the leg and let it get some mobility. i also want to try a bit of ice to reduce swelling in the hock joint.  I am am scheduled for my entry level hospital trainindg for our wildlife center, but not until August.  it would sure be helpful now!