Why Would I Have a Sudden Long Bone Fracture

I just found out that my vitamin D level was low. I started on Vitamin D 50,000 Units per week for 8 wks. I went back to the doctor to have another vitamin D level drawn last Friday after 8 weeks of vit D supplements completed.

I'm waiting on the results now. I also had a bone scan done 1 week prior to the diagnosis of vitamin d deficiency. It was ok.

I don't need another bone scan for 3 more years per my doctor. But I fell outside and broke both bones in my lower leg. What would have cause this???? so quickly.

The emt was surprised that I was sitting up and talking while waiting for them to arrive. I was slightly uncomfortable but not in any major pain. Please respond.