Study Finds at Least One in Four Deceased NFL Players Had Brain Disease CTE

Researchers analyzing the brains of 125 deceased former NFL players found that 33 (26.4%) showed definitive signs of CTE, according to the study led by Dr. Ann McKee, chief of neuropathology at the VA Boston Healthcare System and director of the Boston University CTE Center. The study, published in the Journal of the American Medical Association (JAMA), examined donated brain tissue from players who died between 2016 and 2021, with an average age at death of 60.

CTE is associated with repeated blows to the head and can cause symptoms including memory loss, confusion, impaired judgment, aggression, depression, and progressive dementia. The disease can only be definitively diagnosed post-mortem.

The study's authors noted that because the sample comprised primarily brains donated by families concerned about CTE, the 26.4% figure likely over-represents the true prevalence. However, they also emphasized that the rate is alarmingly high compared to the general population, where CTE is rare. In a comparison group of 35 non-NFL athletes and non-athletes, no cases of CTE were found.

The NFL has acknowledged a link between football and CTE and has implemented rule changes to reduce head impacts, including banning certain types of tackles and kickoffs. In 2015, the league settled a class-action lawsuit with retired players for up to $1 billion over concussion-related claims.

Critics argue that despite these changes, the NFL has not done enough to protect players. Dr. McKee stated, 'We need to continue to work to make the game safer for all participants, from youth to professional levels.' She called for further research into biomarkers and living diagnoses for CTE.

The NFL responded with a statement saying, 'We continue to prioritize player health and safety. The league is committed to supporting research to better understand and prevent head injuries in football.'

Families of deceased players have expressed mixed reactions, with some calling for more protective measures and others accepting the risks of the sport. One widow of a former player, who requested anonymity, said, 'He loved the game, but I wonder if it cost him his future.'

The study adds to a growing body of evidence on CTE and professional football, raising ethical questions about the sport's future and the responsibilities of leagues to protect athletes.

Why This Matters

The study provides the most recent large-scale data on CTE prevalence among NFL players, reinforcing concerns about long-term brain health in contact sports.
It affects not only current and former players but also youth athletes, parents, coaches, and league officials who must weigh participation risks.
The findings could influence ongoing litigation, insurance policies, and future rule changes in football and other sports like rugby and boxing.

Background

CTE has been a known risk in football for decades, but definitive links were only established in the early 2000s after Dr. Bennet Omalu published findings on former NFL player Mike Webster. In 2009, the NFL initially disputed the connection. Subsequent studies by Boston University and others have documented CTE in hundreds of former players, with earlier research suggesting about 87% of deceased NFL players in their brain bank had CTE — though that sample was even more selective.

The current study analyzed brains donated between 2016 and 2021, a period after the NFL implemented concussion protocols and rule changes. The 26.4% rate is lower than some earlier estimates from more selective samples but still far higher than the general public, where CTE prevalence is negligible. The study's authors highlight that the true population rate is unknown.

Key Perspectives

[Researchers (Dr. Ann McKee and team)]: The study confirms CTE is a significant risk for NFL players. They advocate for increased funding for early detection methods, better biomarkers, and continued safety improvements at all levels of play.

[National Football League]: Acknowledges the link between football and CTE and points to recent safety initiatives, including banning kickoffs, limiting contact in practices, and enforcing stricter concussion protocols. The league argues it is taking meaningful steps to mitigate risk.

[Critics and Player Advocates]: Argue the NFL's efforts are too little, too late. They claim rule changes are insufficient to prevent CTE, given the cumulative impact of sub-concussive hits. Groups like the Concussion Legacy Foundation call for banning tackle football for children under 14 and for greater transparency from the NFL.

What to Watch

Follow future studies using larger, less biased samples to better estimate true CTE prevalence among all NFL players, not just those with suspected disease.
Monitor ongoing litigation against the NFL, including individual lawsuits by players and families alleging the league concealed risks.
Track rule changes and youth participation rates, as continued evidence may accelerate calls to modify or ban tackle football for minors.
Watch for development of a living diagnostic test for CTE, which would allow current players to assess their risk and make informed decisions.

ZOTPAPER