Michael Alosco PhD: Head Trauma and Dementia Risk

Chronic Traumatic Encephalopathy (CTE) represents a distinct neurodegenerative disease characterized by the accumulation of phosphorylated tau protein around small blood vessels, differentiating it from Alzheimer’s disease. While traumatic brain injury (TBI) serves as a known risk factor for general dementia, repetitive head impacts—including subconcussive blows common in contact sports—are the primary drivers of CTE. Research indicates that the risk of developing CTE increases by 30% for each additional year of American football participation. Currently, definitive diagnosis requires post-mortem neuropathological examination, complicating clinical intervention. Ongoing efforts focus on identifying biomarkers, such as tau PET imaging and blood-based protein analysis, to facilitate early detection. Furthermore, dementia in former athletes often stems from a complex interplay of pathologies, including tau deposition, white matter loss, and cerebrovascular disease, necessitating a multifactorial approach to diagnosis and treatment.