it would typically require a significant injury again to fracture your metacarpal but the only way you will know for sure it to be examined by your medical provider and perhaps have another x-ray. bones tend to heal well if the fractures were properly lined up but bones can re-break.
can i break the same bone twice. i broke my 3rd metacarpal 10 months ago. this past weekend while doing some work outside my hand started hurting. there was no trauma that i can remember. it has swelled up and is pretty painful. antiinflamitories dont seem to be helping. is it possible i broke it again?