For fresh leg bones, I usually boil in water for a while to get the fat, etc out.
Just hot enough for a few bubbles. If the bone is going to crack, it should happen here and not on knife.

For all organic handle materials, I also soak them in a wood stabilizer when well dried out.

Tim

"The significant problems we face cannot be solved at the same level of thinking we were at when we created them."
Albert Einstein

At Khe Sanh a sign read "For those who fight for it, life has a flavor the protected never knew".