The human balance system is remarkably complex, involving coordination between the inner ear (vestibular system), visual input, proprioceptive feedback from muscles and joints, and processing centers in the brain—particularly the cerebellum and brainstem. When a traumatic brain injury occurs, any of these components can be damaged, disrupting the delicate integration required for normal balance and coordination.
The cerebellum, located at the back of the brain, is especially vulnerable in acceleration-deceleration injuries common in car accidents. This structure coordinates voluntary movements, maintains posture, and ensures smooth, balanced motor function. Damage to the cerebellum results in ataxia—a condition characterized by unsteady gait, difficulty with fine motor tasks, and problems with coordination. Even mild traumatic brain injuries can cause temporary or permanent cerebellar dysfunction.
Additionally, brain injuries can damage the vestibular nerve or the brain's vestibular processing centers, leading to vertigo (a spinning sensation), dizziness, and spatial disorientation. These symptoms often worsen with head movements or changes in position, making everyday activities like driving, working, or even walking down stairs extremely challenging and dangerous.