What is Metatarsal Stress Fracture Troughing?

I got a call from a runner who had a stress fracture that was not healing, who needed a second opinion.  When we were on the webcam call, one of the things that he did not understand was the specific medical terms on his MRI report. The MRI report said that he had "troughing" of the fractured metatarsal bone.  I just thought that it might be helpful to explain to you what metatarsal troughing really means and how it shows up on an MRI. Today on the Doc On The Run podcast, we’re talking about what is metatarsal stress fracture troughing.