Please help kitty to save the leg

Hello, my name is Iana and this is my cat Tiga.

He was lost for a two and a half weeks and when came back he had severe tarsal fracture of his back leg.

Unfortunately, the damage is so bad, that his joint and some bones cannot be restored.

2 options that were given to us are 1) completely amputate the leg or 2) try to do the Arthrodesis surgery ( it is when they put plates and screws).

He will be limping forever but at least we try to save his leg.

The surgery cost is $5,256 and it is very massive amount.

We are asking for help to be able to save the leg of my babe boy.