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Here's a fractured Fibula
One of my students. Walked around for 3 days thinking he had a badly bruised leg from a hard low kick.
The fibula isn't really weight bearing during normal walking, so I've seen people walk on those kinds of fractures for days. I've seen healed fibula fractures on X-Rays and asked people about them only to find out they never knew they had broken it.
A tibial fracture at the same location can be ambulatory, depending in large part on the footwear. If you're wearing boots that support the ankle, they will act as a splint.