The period after diagnosis is a critical window for preventing falls
Among older veterans, a large study has uncovered a sobering loop in the architecture of aging and injury: neurological conditions such as dementia, stroke, epilepsy, and Parkinson's disease do not merely follow traumatic brain injury — they appear to precede and invite it. Published in Neurology, the research traces a bidirectional relationship in which compromised balance, cognition, and motor control make falls more likely, while falls in turn deepen neurological harm. The finding reframes TBI prevention not as a response to catastrophe, but as a responsibility that begins the moment a neurological diagnosis is made.
- Older veterans with a recent traumatic brain injury were three to four times more likely to have already been diagnosed with stroke, dementia, epilepsy, or Parkinson's disease — suggesting these conditions are risk factors, not just consequences.
- Falls are the leading cause of TBI in older adults, and neurological disease quietly erodes the balance, coordination, and cognition that protect people from falling in the first place.
- After a TBI, the risk of developing stroke or epilepsy doubled, and dementia risk rose by nearly a quarter — confirming the cycle runs in both directions.
- The study's 55,000-veteran dataset revealed stark numbers: stroke diagnoses appeared at three times the rate among TBI patients, and epilepsy at four times, even after controlling for other health factors.
- Researchers argue that the window immediately after a neurological diagnosis is a critical — and currently underused — moment to intervene with fall prevention programs, physical therapy, and home safety modifications.
A study of more than 55,000 older veterans has surfaced something unexpected about traumatic brain injury: the relationship between TBI and neurological disease appears to run in both directions. Researchers found that veterans who had recently suffered a TBI were three to four times more likely to have been diagnosed with stroke, dementia, epilepsy, or Parkinson's disease in the year before their injury than peers of similar age without a TBI. The implication is significant — these conditions may themselves be risk factors for traumatic brain injury, not just its aftermath.
The study compared 13,801 veterans with a recent TBI, average age 78, against more than 41,000 veterans without one, reviewing health records for a full year before and after the injury. The numbers were stark: stroke was diagnosed at 64 cases per 1,000 person-years in the TBI group versus 20 in the comparison group; dementia at 58 versus 19; epilepsy at 14 versus 4; and Parkinson's disease at 10 versus 3. These gaps persisted even after accounting for diabetes, smoking, and prior cardiac events.
The mechanism is rooted in how neurological disease erodes the body's most basic defenses against falling. Conditions like Parkinson's, dementia, and stroke impair motor control, balance, and gait — precisely the capacities that keep older adults upright. Since falls are the leading cause of TBI in this population, any condition that undermines physical stability quietly raises the odds of a catastrophic head injury.
The study also confirmed that TBI increases the risk of developing these conditions afterward. Participants were twice as likely to develop stroke or epilepsy following a TBI, and 24 percent more likely to develop dementia. Parkinson's disease showed no significant increase in the follow-up window, a finding researchers attributed to the study's relatively short timeframe rather than an absence of long-term risk.
Researcher Carrie Peltz of the San Francisco VA Health Care System pointed to a practical takeaway: the moment a neurological diagnosis is made represents a critical window for fall prevention. Rapid referral to physical therapy, occupational therapy, home safety modifications, and medication review could interrupt the cycle before a TBI occurs. The study's veteran-only sample limits how broadly its findings can be applied, and those who died from severe injuries within the follow-up year were excluded — but the core message holds: preventing traumatic brain injury in older adults requires looking upstream, toward the conditions that make falling more likely in the first place.
A study of more than 55,000 older veterans has revealed something counterintuitive about traumatic brain injury and neurological disease: the relationship between them appears to flow in both directions. Researchers publishing in Neurology this month found that people who had recently suffered a traumatic brain injury were three to four times more likely to have been diagnosed with stroke, dementia, epilepsy, or Parkinson's disease in the year before their injury than veterans of similar age who had not experienced a TBI. The finding suggests that these neurological conditions themselves may be a risk factor for traumatic brain injury in older people—a possibility that has significant implications for how doctors approach prevention and screening.
The study examined 13,801 veterans with an average age of 78 who had experienced a recent traumatic brain injury, comparing their medical histories to 41,403 veterans of the same age without a TBI. Researchers reviewed health records for a full year before and after the injury event, looking specifically at diagnoses of the four neurological conditions. The numbers were striking. For stroke, the rate of new diagnosis was 64 cases per 1,000 person-years among those with a TBI, compared to 20 cases among those without. For dementia, the figures were 58 versus 19. Epilepsy showed 14 new cases per 1,000 person-years in the TBI group against 4 in the comparison group. Parkinson's disease appeared at a rate of 10 per 1,000 person-years for TBI patients and 3 for others. Even after accounting for other risk factors like diabetes, smoking, and prior heart attacks, people with a TBI remained four times more likely to have been recently diagnosed with epilepsy and three times more likely to have received a diagnosis of stroke, dementia, or Parkinson's disease.
The mechanism behind this association appears to lie in how neurological disease affects basic physical function. Carrie Peltz, a researcher at the San Francisco Veterans Affairs Health Care System, explained that conditions like dementia, stroke, epilepsy, and Parkinson's disease commonly impair motor control, balance, gait, and coordination—the very capacities that keep people upright and mobile. Falls are the leading cause of traumatic brain injury in older adults, and when someone's neurological health is already compromised, the risk of falling rises substantially. A person struggling with balance problems or cognitive decline is simply more vulnerable to the kind of accident that results in a head injury.
The study also examined whether traumatic brain injury itself increased the risk of developing these conditions afterward. The answer was yes, though the pattern varied by condition. After experiencing a TBI, participants were twice as likely to develop stroke or epilepsy compared to the year before their injury. They were 24 percent more likely to develop dementia. Parkinson's disease, however, showed no significant increase in the follow-up period—a finding Peltz attributed to the relatively short timeframe of the study, since longer-term research has previously documented an elevated risk.
These findings point toward a practical intervention strategy. Peltz argued that the period immediately following a neurological diagnosis represents a critical window for prevention. Screening older adults for their fall risk at the time they receive a diagnosis of stroke, dementia, epilepsy, or Parkinson's disease, followed by rapid referral to physical therapy, occupational therapy, or structured fall prevention programs, could reduce the likelihood of traumatic brain injury. The evidence supporting such interventions is already substantial: strength and balance training, home modifications like grab bars and removal of tripping hazards, and medication review have all been shown to lower fall risk in older populations.
The study does carry limitations worth noting. The requirement that participants have medical records available one year after their TBI excluded people who died from severe injuries within that timeframe, potentially underestimating the true burden of serious brain injury. Conversely, people with mild TBI who never sought medical care were also not captured. And because all participants were veterans, the findings may not generalize to the broader older adult population. Still, the bidirectional relationship between traumatic brain injury and neurological disease suggests that prevention strategies need to account for the vulnerability that comes with conditions like dementia and stroke—not just the consequences that follow a head injury.
Citações Notáveis
Neurological diseases often impair motor control, balance, gait, coordination and thinking skills—all of which make people more likely to fall, which is the main cause of TBI in older adults.— Carrie Peltz, San Francisco Veterans Affairs Health Care System
Our results argue for screening older adults for their risk of falling at the time they are diagnosed and quickly referring them to physical therapy, occupational therapy or fall prevention programs.— Carrie Peltz
A Conversa do Hearth Outra perspectiva sobre a história
Why does having a neurological disease make someone more likely to have a traumatic brain injury? That seems backward from what we usually hear.
It's not backward—it's just a different direction of causation. When you have dementia or Parkinson's, you lose the physical stability and cognitive sharpness that keep you from falling. A person with balance problems or impaired thinking is simply more likely to take a tumble, and falls are how most older people get head injuries.
So the study found that people with these conditions were already at higher risk before they had a TBI?
Yes. They looked back a year before the injury and found that people who later had a TBI were already three to four times more likely to have been diagnosed with stroke, dementia, epilepsy, or Parkinson's in that previous year. The conditions came first, or at least were diagnosed first.
And then after the TBI, did the risk of developing these conditions go up?
It did for some. People were twice as likely to develop stroke or epilepsy after a TBI compared to before. Dementia risk went up 24 percent. Parkinson's didn't show an increase, but the researchers think that's because the study didn't follow people long enough.
So it's a cycle—the disease makes you fall, the fall injures your brain, and the injury might trigger more disease.
That's the pattern the data suggests. Which is why the researchers are saying doctors should screen for fall risk the moment someone gets diagnosed with one of these conditions. Catch it early, get them into physical therapy or balance training, and you might prevent the injury that starts the next cycle.
What kind of people were in the study?
Veterans, mostly in their late seventies. That's important because the findings might not apply to younger people or to people outside the military health system. But for older adults in general, the message is the same: these conditions are a warning sign that someone needs help staying on their feet.