TBI Linked to Prolonged Work Disability, Severity a Key Factor

Patients who experience a traumatic brain injury (TBI) face a significantly elevated risk of work disability, a new study reveals, with the likelihood and duration of absence from work increasing alongside the severity of the injury. Published in Neurology on March 1, 2026, the research underscores the complex, long-term impact of TBI, extending beyond the initial acute phase and highlighting the need for comprehensive, individualized rehabilitation strategies.

Population Impact and Injury Severity

The population-based, longitudinal study, conducted by researchers at Uppsala University in Sweden, followed 98,256 individuals with a TBI and compared them to a control group of 981,191 people without TBI over a period spanning 2005 to 2016. Researchers classified TBI severity into three groups: those requiring less than or equal to two days of healthcare, those hospitalized for three or more days without neurosurgery, and those undergoing neurosurgical intervention. The study revealed a clear correlation between injury severity and the probability of work disability.

Specifically, the study found that 26% of individuals with no TBI experienced some period of work disability during the follow-up period. This figure rose to 45% for those with TBI requiring two days or less of care, 67% for those hospitalized for three or more days without surgery, and 72% for those who underwent neurosurgery. These proportions highlight the substantial burden TBI places on workforce participation.

The researchers also noted that even individuals with less severe TBIs experienced a delayed, yet persistent, increase in work disability. Over five years, those with care lasting two days or fewer averaged 526 days of work disability, while those with neurosurgery averaged 1,201 days. This finding challenges the conventional view of mild TBI as a short-term event and emphasizes the potential for prolonged functional impairment.

Risk Factors and Comorbidities

Beyond injury severity, several pre-existing factors were identified as increasing the risk of work disability following TBI. These included older age, female sex, blue-collar occupations, and the presence of pre-existing psychiatric or substance use disorders. Interestingly, the influence of these factors varied depending on the severity of the injury. For example, in milder injuries, factors like female sex and psychiatric disorders played a more prominent role, while in the most severe cases, the injury itself was the dominant driver of outcomes.

The study also highlighted the importance of socioeconomic factors. Individuals living alone, those with pre-injury work disabilities, and those with existing comorbidities were more likely to experience work disability after a TBI. These findings suggest that addressing these underlying vulnerabilities is crucial for optimizing rehabilitation outcomes.

Understanding Work Disability Transitions

The study’s methodology, which tracked individuals’ transitions into and out of work disability over time, provides a more nuanced understanding of the recovery process than traditional “return-to-work” studies that assess outcomes at a single point in time. Researchers found that patients with TBI were more likely to transition from a state of non-work disability (not receiving benefits) to work disability (receiving benefits) compared to those without TBI. This suggests that TBI can trigger a cascade of events leading to long-term workforce detachment.

As study authors Andrea Klang, MD, and Elham Rostami, MD, PhD, explained in a joint statement, “We wanted to examine how individuals move in and out of work disability over several years, and how injury severity and pre-injury factors influence that process.” Their findings underscore the dynamic nature of recovery after TBI and the need for ongoing monitoring and support.

Implications for Rehabilitation and Support

The study’s findings have significant implications for the design and delivery of rehabilitation services for individuals with TBI. The researchers emphasize the need for individualized rehabilitation plans that address not only the physical and cognitive impairments resulting from the injury but also the associated socioeconomic and psychological factors.

“These findings support the view of TBI as a chronic condition rather than a short-term event,” Klang and Rostami stated. They recommend that clinicians monitor patients beyond the acute phase, even those with less severe injuries, and provide targeted rehabilitation and vocational support to individuals identified as being at high risk of long-term work disability.

The researchers also call for further research to identify modifiable risk factors and to test interventions aimed at preventing long-term work disability. This includes exploring strategies to improve workplace accommodations, promote partial return-to-work programs, and address the mental health needs of individuals with TBI. Revised treatment frameworks are beginning to place more focus on the acute phase, but long-term support remains critical.

The Role of Systemic Support

Beyond individual-level interventions, the study highlights the need for systemic changes to support individuals with TBI. This includes ensuring access to comprehensive rehabilitation services, providing financial assistance to those unable to work, and promoting employer awareness of TBI and the importance of workplace accommodations.

As noted by Rab Nawaz Khan, MD, a consultant neurologist, in a perspective piece accompanying the study, “The biggest policy need is sustained access to rehabilitation and vocational support beyond the early post-injury window, including for mild TBI.” He argues that coverage should extend to cognitive rehab, vestibular therapy, mental health care, and return-to-work coordination.

Further research is needed to standardize tracking of work disability outcomes and improve documentation of TBI severity, which would facilitate better care planning and research comparisons. A comprehensive approach to TBI research, as highlighted by experts, is essential for advancing our understanding of this complex condition and improving outcomes for affected individuals.

For more information:

Andrea Klang, MD can be reached at [email protected]. Elham Rostami, MD, PhD, can be reached at [email protected].