Not uncommon. Metatarsal fractures too.
> We know
> these things happen but what is the scientific reason the
> fracture doesn't show on the original film taken on the day
> of injury?
They don't show on the day of injury because they are undisplaced fractures and in the wrong plane- in the plane of the x-ray beam there isn't a gap for the little rays to get through. Kind of like stress fractures of the navicular that are really obvious on CT but not on plain films because of the wrong plane. A few days later, there's been a bit of osteoclasis, so more rays get through the gap. Metatarsals tend to displace quite a lot over the first week as well. You might pick up a few of these on ultrasound; and you'd certainly pick some up on CT or MRI.
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