Repeated concussions can thicken the skull bones

A research team led by Monash University has found that repeated concussions can result in thicker, denser bones in the skull, with their results published in the journal Scientific Reports. Previous studies have shown damage to the brain following concussion, but have not looked at the brain’s protective covering.

Concussion is a form of mild traumatic brain injury, and repeated concussions have been linked to long-term neurological consequences. Most studies focus on understanding how these head injuries affect the brain and its function, but they largely ignore the overlying skull bones that protect the brain, which like all bones are active living tissues that can respond to applied mechanical forces.

Study collaborator Professor Melinda Fitzgerald, from Curtin University and the Perron Institute in Western Australia, has previously shown that repeated concussive impacts lead to subtle problems with memory and evidence of brain damage. In the new study, high-resolution neuroimaging and tissue staining techniques were used in a preclinical model, and revealed an increase in bone thickness and density in close proximity to the site of injury.

“We have been ignoring the potential influence of the skull in how concussive impacts can affect the brain,” said study leader Associate Professor Bridgette Semple. “These new findings highlight that the skull may be an important factor that affects the consequences of repeated concussions for individuals.”

It is still unclear whether this thickening of the skull is a good thing or a bad thing. In theory, a thicker skull is a stronger skull, suggesting that this may be the bone’s attempt to protect the brain from subsequent impacts.

“This is a bit of a conundrum,” Semple said. “As we know, repeated concussions can have negative consequences for brain structure and function. Regardless, concussion is never a good thing.”

The team hopes that the microstructural skull alterations caused by concussion will be considered by researchers in the field to better understand how concussions affect the whole body. Future studies are also being planned, with collaborator and bone expert Professor Natalie Sims from St Vincent’s Institute of Medical Research in Melbourne, to understand if a thickened skull resulting from repeated concussions alters the transmission of impact force through the skull and into the vulnerable brain tissue underneath.

Image credit: iStock.com/leonello

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