Sometimes broken bones fail to fuse together, and understanding why some bones mend while others need more help will improve care for people with fractures.
Aug. 26, 2022 – Healing a broken bone isn't always a straightforward process of putting on a cast and waiting for the body to do its thing with time. The many materials that make up our bones have different densities and interact in several ways that affect whether a fracture heals correctly., such as a leg bone, it can be disabling. And doctors can't always tell when a nonunion has occurred, much less how to predict how likely it is ahead of time.
Mechanical engineering researchers at Lehigh University in Bethlehem, PA, are using bone imaging and virtual mechanical testing to develop a moreA virtual model can help doctors recognize when a bone strays from a healthy healing process so they can step in sooner. The key is to better understand the physical process in the healing zone where the fracture is actually being repaired.
Previous computer models couldn't accurately tell hard callus from hard bone, largely because callus itself is made up of different types of tissue with different physical properties. But this new research relies on testing the stress put on the bone during twisting. The researchers fed those testing results and corresponding CT images into a computer to model the healing process. Brighter areas on the image represent stiffer, harder bone, so their work helped investigators figure out the cutoff point when the material stops being callus and changes to bone.
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