Years ago I had ducklings
When they were about 3 weeks old; couple of them became handicapped; their legs were collapsing.
We had a friend a real people doctor
.he was visiting us for a drink from time to time
He saw my ducklings. Told me; give me this duck
.and he took small piece of wood and bandaged together with the legs he sort of made additional steady legs!
And
believe it or not, in couple of days the ducks started walking again. Also he told me to change their diet for a while; give them less moist food and keep them dry for some time.
I dont know how old your goose is. If just a newborn, I suppose you can put human bandage: Each end wrapped around to each leg, the soft bandage part stays in between the legs.