Is it true that if I can walk on my foot it probably isn't broken?
Totally NOT TRUE! Many people are walking around on broken bones, especially if it is a hairline fracture. If you have fallen or twisted your foot or ankle, and have noticed swelling and bruising; there is a good chance you may have broken something. Better to get an x-ray and make sure it's not broken then to walk around in pain for months due to failure to properly treat your injury!