A dramatic rise in the use of electric bikes and scooters is fueling a surge in severe brain and spine injuries across urban centers, according to a new study from researchers at NYU Langone Health. The findings reveal a stark shift in the types of trauma arriving in city emergency rooms, with micromobility-related accidents now accounting for a significant portion of critical neurosurgical cases.
The research, published in the journal Neurosurgery, analyzed data from NYC Health + Hospitals/Bellevue over a five-year period. The results highlight a troubling trend: the share of emergency room trauma cases involving these devices climbed from less than 10 percent in 2018 to more than 50 percent by 2023. This shift suggests that as electric bikes and scooters become staples of city transit, the medical infrastructure is facing a new, high-volume category of traumatic brain injury (TBI).
For those treating these patients, the severity is the primary concern. The study found that nearly 7 percent of all trauma patients admitted to the hospital were there due to these injuries. Of the 914 patients analyzed, one-third suffered a traumatic brain injury, and roughly 30 percent required treatment in the intensive care unit. More than two-thirds of the total patient group required hospital admission, underscoring that these are rarely minor falls.
The Hidden Danger to Pedestrians
Although much of the public conversation around e-bike safety focuses on the riders, the data suggests that pedestrians may be at even greater risk. When struck by electric vehicles, the 69 pedestrians analyzed in the study suffered brain injuries at nearly double the rate of the riders themselves.
The timing of these accidents also points to a specific urban phenomenon. Injuries peaked between 6 p.m. And 8 p.m., a window that researchers suggest may be linked to the heavy volume of e-bike delivery traffic during the dinner rush. This intersection of high-speed delivery vehicles and dense pedestrian crowds creates a volatile environment where the lack of physical separation between users often leads to catastrophe.
Our study shows that micromobility injuries are producing serious brain and spinal trauma that demands neurosurgical care at a scale we haven’t seen before. In a busy urban setting, we are seeing more and more of these injuries firsthand. The data point to actionable solutions—helmet use, safer bike lane design, and enforcement—that could prevent many of these injuries and better protect both riders and pedestrians, who in our study often sustained even more severe brain injuries than the riders themselves.
— Hannah Weiss, MD, resident in the Department of Neurosurgery at NYU Grossman School of Medicine
Risk Factors and Preventable Trauma
The study identified several recurring factors that contributed to the severity of the injuries. Collisions with cars or trucks were the most common cause, accounting for approximately half of all cases. This suggests that the conflict between motorized vehicles and micromobility users remains the primary driver of critical trauma.
Safety equipment—or the lack thereof—played a decisive role in patient outcomes. Fewer than one-third of the riders involved in the study were wearing helmets, a factor directly linked to significantly higher rates of facial and brain injuries. About 20 percent of patients tested positive for alcohol, which was associated with both a lower likelihood of wearing a helmet and more severe brain trauma.
| Metric | Finding |
|---|---|
| ER Case Share (2018 vs 2023) | <10% to >50% |
| Traumatic Brain Injury Rate | ~33% of patients |
| ICU Admission Rate | ~30% of patients |
| Helmet Usage Rate | <33% of riders |
| Primary Cause of Injury | Collision with car/truck (~50%) |
The Need for Infrastructure Evolution
From a clinical perspective, the surge in electric bike and scooter brain injuries is seen as a failure of urban design to keep pace with technology. As devices become faster and more powerful, the “fragility” of the human body remains constant, making physical protection and separation essential.
Paul P. Huang, MD, associate professor in the Department of Neurosurgery at NYU Grossman School of Medicine and chief of neurosurgery at NYC Health + Hospitals/Bellevue, emphasized that medical intervention is only the final step in a longer chain of prevention. He noted that urban infrastructure must evolve to protect users.
According to Dr. Huang, the next critical step is determining which specific interventions—such as protected bike lanes, helmet mandates, or stricter speed enforcement—actually correlate with a decrease in the number of neurosurgical procedures performed. He called for expanded studies across multiple cities to validate these safety measures.
The research team, which included Drs. Nora Kim and Cordelia Orillac from NYU Langone, as well as contributors from Maimonides Medical Center, the Barrow Neurological Institute, and Northwell Health, suggests that the current trajectory of urban mobility is unsustainable without a corresponding increase in safety enforcement and city planning.
Disclaimer: This article is for informational purposes only and does not constitute medical advice. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition.
As cities continue to integrate micromobility into their transit grids, the next phase of research will likely focus on the efficacy of “protected” infrastructure. Public health officials and urban planners are expected to use this data to refine safety ordinances and lane designs in major metropolitan areas throughout the coming year.
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