How can an MRI show a fracture and possible osteomyelitis without an injury?

Shows inflamation. Inflamation and fractures can be seen on an mri. Only a culture will let you know if it is an actual infection / osteomyelitis.
MRI's don't know! Mri stands for magnetic resonance imagery. Mri works by using a large magnetic force to excite hydrogen molecules. When the molecules.