"Anything they gave me wouldn't take the pain away.
"I spoke to a few people and a few jockeys have lost their legs through similar things and I needed surgery. "
Surgeons made a cut from knee to ankle to relieve pressure, there was a second surgery on Sunday, and he was due to go under the knife again today (Tuesday).
"They attempted to close up the leg (on Sunday) but it was still too swollen," he said.
"The thing is the fall was just nothing to come out like this is unbelievable.
"I remember the whole thing like it was slow mo. I had time to think about it and then all of a sudden when my feet hit the ground, her back leg came back through and kicked me in the calve.
"Her hitting my calf burst everything inside."
The injury was complicated by dangerous Compartment Syndrome, when pressure within muscle builds up.
Walker may need a fourth surgery and skin grafts, depending on the outcome of today's operation.
The accident occurred at the Packenham Racing Club when his horse Insaaf clipped the heels of the eventual winner and faltered, dislodging the jockey.
Walker told Racing.com it was "one of the most harmless (incidents) I've ever been involved in and could be the worst".
Victorian stewards have interviewed three jockeys but must wait until Walker is fit enough before completing their inquiry.
