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Chronic traumatic encephalopathy in athletes: Progressive tauopathy after repetitive head injury

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McKee, Ann C., Cantu, Robert C., Nowinski, Christopher J., Hedley-Whyte, E. Tessa, Gavett, Brandon E., Budson, Andrew E., Santini, Veronica E., Lee, Hyo-Soon +2 more·2009·Journal of Neuropathology & Experimental Neurology

Abstract

Since the 1920s, it has been known that the repetitive brain trauma associated with boxing may produce a progressive neurological deterioration, originally termed dementia pugilistica, and more recently, chronic traumatic encephalopathy (CTE). We review 48 cases of neuropathologically verified CTE recorded in the literature and document the detailed findings of CTE in 3 profession althletes, 1 football player and 2 boxers. Clinically, CTE is associated with memory disturbances, behavioral and personality changes, parkinsonism, and speech and gait abnormalities. Neuropathologically, CTE is characterized by atrophy of the cerebral hemispheres, medial temporal lobe, thalamus, mammillary bodies, and brainstem, with ventricular dilatation and a fenestrated cavum septum pellucidum. Microscopically, there are extensive tau-immunoreactive neurofibrillary tangles, astrocytic tangles, and spindle-shaped and threadlike neurites throughout the brain. The neurofibrillary degeneration of CTE is distinguished from other tauopathies by preferential involvement of the superficial cortical layers, irregular patchy distribution in the frontal and temporal cortices, propensity for sulcal depths, prominent perivascular, periventricular, and subpial distribution, and marked accumulation of tau-immunoreactive astrocytes. Deposition of beta-amyloid, most commonly as diffuse plaques, occurs in fewer than half the cases. Chronic traumatic encephalopathy is a neuropathologically distinct slowly progressive tauopathy with a clear environmental etiology.

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  • It is well established that a large percentage of former athletes identified as having CTE neuropathology also have neuropathology associated with age related neurodegenerative diseases such as AD, PD, Lewy body disease, hippocampal sclerosis, and ALS to the extent that they meet full neuropathological criteria for an alternative, well-characterized neurodegenerative disease.

    “It is now well established that a large percentage of former athletes identified as having CTE neuropathology also have neuropathology associated with age related neurodegenerative diseases such as AD, PD, Lewy body disease, hippocampal sclerosis, and ALS [14, 41–44] to the extent that they meet full neuropathological criteria for an alternative, well-characterized neurodegenerative disease [16].”

    From The Need to Separate Chronic Traumatic Encephalopathy Neuropathology from Clinical Features (2017) · cites this paper as [14]

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  • In publications from 2005-2015, CTE has been described as a progressive neurodegenerative disease characterized by a broad and diverse range of both macroscopic and microscopic neuropathology.

    “In publications from 2005–2015, CTE has been described as a progressive neurodegenerative disease characterized by a broad and diverse range of both macroscopic and microscopic neuropathology.”
  • The clinical syndrome of CTE includes behavioral, mood, and cognitive dysfunction as well as occasional extrapyramidal motor symptoms.

    “The clinical syndrome of CTE continues to be refined but includes behavioral, mood, and cognitive dysfunction as well as occasional motor symptoms that are typically extrapyramidal (1,2).”
  • The prevailing theory of CTE, often expressed in articles as fact, is that it is a distinct and unique neurodegenerative disease.

    “In conclusion, the prevailing theory of CTE, often expressed in articles as fact, is that it is a distinct (1, 3, 9-11) and unique (10) neurodegenerative disease (9-13).”
  • The clinical symptoms associated with CTE were examined in case summaries throughout the twentieth century; however, the disease presentation described in these reports was inconsistent.

    “The clinical symptoms associated with this disease were examined in case summaries throughout the twentieth century; however, the disease presentation described in these reports was inconsistent [38, 65, 92, 100, 126].”

    From The neuropathology of sport (2014) · cites this paper as [126]

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Research works printed but not linked: 4

  1. [27]Millspaugh JA Dementia pugilistica US Naval Medicine Bulletin 1937 35 297 303
  2. [30]Brandenburg W Hallervorden J Dementia pugilistica with anatomical findings Virchows Arch 1954 325 680 709 13226712
  3. [45]Galvin JE Roe CM Powlishta KK The AD8: A brief informant interview to detect dementia Neurology 2005 65 559 64 16116116
  4. [68]Blumbergs PC Scott G Manavis J Staining of amyloid precursor protein to study axonal damage9 in mild head injury Lancet 1994 344 1055 56 7523810

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Authors
McKee, A. C., Cantu, R. C., Nowinski, C. J., Hedley-Whyte, E. T., Gavett, B. E., Budson, A. E., Santini, V. E., Lee, H.-S., Kubilus, C. A., & Stern, R. A.
Affiliations
Boston University (US)
Venue
Journal of Neuropathology & Experimental Neurology
Published
2009-07
Volume
68
Issue
7
Pages
709-735
ISSN
  • 0022-3069 (ISSN-L)
  • 1554-6578
OpenAlex
W2081325915
Cited by
2,295
References
123
Citations by year
2026: 47 · 2025: 77 · 2024: 95 · 2023: 106 · 2022: 117 · 2021: 143 · 2020: 186 · 2019: 184 · 2018: 160 · 2017: 179 · 2016: 178 · 2015: 183 · 2014: 176 · 2013: 189 · 2012: 115
FWCI
60.65
Type
journal article
Language
en
Open access
Locations
  • Journal of Neuropathology & Experimental Neurology (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
  • Digital Access to Scholarship at Harvard (DASH) (Harvard University) (submittedVersion, cc-by)
Funders
National Institute on Aging (P30AG013846, P30-AG13846))
Topics
  • Health Sciences › Medicine › Epidemiology › Traumatic Brain Injury Research
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Health Sciences › Medicine › Neurology › Traumatic Brain Injury and Neurovascular Disturbances
Keywords
chronic traumatic encephalopathy, tauopathy, repetitive head injury, boxing, professional athletes, neurofibrillary tangles, brain atrophy, amyloid plaques, memory impairment, behavioral and personality changes, neuropathology
MeSH terms
Adult, Aged, Aged, 80 and over, Athletic Injuries, Brain, Brain Chemistry, Female, Humans, Male, Middle Aged, Neurons, Sports, Amyloid beta-Peptides, Head Injuries, Closed, Cell Death, Disease Progression, Genetic Predisposition to Disease, Brain Injury, Chronic, Tauopathies, Apolipoprotein E4

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