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Chronic traumatic encephalopathy and athletes.

William Meehan1, Rebekah Mannix2, Ross Zafonte2

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Repetitive head trauma in athletes may lead to chronic traumatic encephalopathy (CTE), but current evidence is limited. More research is needed to understand the causes of CTE and its associated neurobehavioral symptoms.

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Area of Science:

  • Neurology
  • Sports Medicine
  • Pathology

Background:

  • Case reports link repetitive head trauma in athletes to later-life mood disorders, cognitive decline, and behavioral changes.
  • Postmortem examinations reveal chronic traumatic encephalopathy (CTE) pathology in some affected athletes.
  • Current hypotheses implicate concussions and subconcussive blows as causes of CTE's clinical and pathological findings.

Purpose of the Study:

  • To review the current evidence regarding chronic traumatic encephalopathy (CTE) in athletes.
  • To discuss the limitations in understanding the causes and clinical observations of CTE.
  • To address the ongoing debate surrounding the causality of CTE and its associated neurobehavioral sequelae.

Main Methods:

  • Review of existing case reports and studies on athletes with head trauma.
  • Analysis of hypotheses linking head trauma (concussions, subconcussive blows) to CTE.
  • Discussion of limitations including lack of prospective data and potential biases in current research.

Main Results:

  • Some athletes exposed to head trauma develop CTE, while others do not.
  • Individuals without a history of head trauma can exhibit similar symptoms to CTE patients.
  • Existing studies are limited by a lack of prospective data and potential for referral and recall bias.

Conclusions:

  • The causal relationship between head trauma, CTE pathology, and neurobehavioral symptoms remains unclear.
  • Further well-designed prospective and case-control studies are necessary to establish causality.
  • The role of sports participation, concussions, and subconcussive blows as sole causes of CTE requires further investigation.