Welcome to Healthcaremagic.
Such a presentation is most commonly seen in hairline fractures
.Hair line fractures are very common in wide and thick bones.
These fractures do not hurt soon after the injury
but do cause severe pain
after few days or weeks.
I would advice you to get a Xray done if it doesn't show the fracture clearly then you may be needing a CT scan
to rule out such problems.
Do visit a Orthopedicians for the same.
Wish you good health.