What are the risks of having an ankle fracture from twisting it?

Depends: Most ankle twists (sprains) do not involve a fracture but occasionally a more severe twist will cause something called an avulsion fracture where the twisted ligament pulls a small piece of bone away and this is called an avulsion fracture.

Depends on severity: If the twist is severe enough with enough force, various types of ankle fractures are possible.

Depends: On age, health status fitness level, method of twist, when you consider the # of sprains fractures are a small %.