Study Snapshot
Study Design
This was a prospective cohort study conducted across 12 VA medical centers between 2017 and 2021. The research team, led by Dr. Rachel Torres at Stanford, followed 2,847 post-9/11 veterans who had been diagnosed with both posttraumatic stress disorder (PTSD) and traumatic brain injury (TBI) — a combination so common in this population that clinicians call it the "polytrauma clinical triad" when chronic pain is included (Vanderploeg et al., 2022)Vanderploeg RD, Belanger HG, Horner RD, et al. "Health Outcomes Associated With Military Deployment." J Head Trauma Rehabil. 2022;37(1):12-22..
The critical question wasn't whether treatment works — we know both PTSD-focused therapies like Cognitive Processing Therapy (CPT) and TBI rehabilitation show solid outcomes individually. The question was about sequencing: Should clinicians treat one condition first, then the other? Or should integrated, simultaneous treatment protocols be the standard?
Veterans were assigned to one of two treatment pathways based on clinical availability at their site — not randomization, which is an important limitation. The integrated group (n=1,523) received concurrent therapy addressing both conditions. The sequential group (n=1,324) received PTSD treatment first, followed by TBI-focused rehabilitation. Primary outcomes were measured using the PTSD Checklist (PCL-5) and the Neurobehavioral Symptom Inventory (NSI) at 6, 12, 24, and 48 months (Torres et al., 2023)Torres R, Chen L, Morrison K, et al. "Integrated Treatment for Co-Occurring PTSD and TBI Among Post-9/11 Veterans." JAMA Psychiatry. 2023;80(9):891-901..
Key Findings
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What This Means For You
If you're a veteran dealing with both PTSD symptoms and lingering effects from a head injury — and research suggests roughly 44% of post-9/11 combat veterans with PTSD also have a co-occurring TBI (Stein & McAllister, 2009)Stein MB, McAllister TW. "Exploring the Convergence of Posttraumatic Stress Disorder and Mild Traumatic Brain Injury." Am J Psychiatry. 2009;166(7):768-776. — this study suggests that the order in which you receive treatment matters more than most clinicians previously thought.
The traditional approach has been sequential: stabilize the PTSD, then address the cognitive and neurological symptoms of TBI. This study challenges that assumption. When both conditions were treated together — using a protocol that combined trauma-focused therapy with cognitive rehabilitation and vestibular treatment in the same care plan — veterans didn't just do better on paper. They stayed in treatment longer, went to the ER less often, and got back to their lives faster.
Practically, this means if you're currently in VA care and feel like treatment isn't working, it may be worth asking your provider whether your TBI symptoms are being addressed alongside your PTSD — not after. The VA's own Polytrauma System of Care is designed for this kind of integrated approach, but not every facility implements it equally. Bringing this research to your next appointment is a concrete step.
Limitations & Caveats
- Not a randomized controlled trial. Veterans were assigned to treatment groups by site availability, not randomization. This introduces selection bias — sites offering integrated care may have had more resources or better-trained staff overall.
- Self-selected population. Participants had to agree to 48 months of follow-up. Veterans who dropped out early or avoided VA care entirely aren't captured — and these are often the most symptomatic individuals.
- Post-9/11 veterans only. Findings may not generalize to Vietnam-era, Gulf War, or older veteran populations with different injury profiles and decades of untreated symptoms.
- VA system dependency. All 12 sites were VA medical centers. Results may not apply to veterans receiving community care, TRICARE, or private treatment.
- Funding source. Funded by VA Rehabilitation Research & Development and DoD CDMRP. While standard for veteran health research, military-affiliated funding warrants transparency about potential institutional bias toward positive findings.
This study adds meaningful evidence to what many polytrauma clinicians have suspected for years: treating PTSD and TBI separately creates a revolving door. The 47% improvement gap is large enough to change practice, and the 38% completion rate difference speaks directly to the VA's most persistent challenge — keeping veterans engaged in care long enough for it to work.
That said, we'd caution against reading this as "integrated treatment is always better." The non-randomized design means we can't rule out that the integrated sites were simply better-resourced VA facilities. The VA system varies enormously by region — a veteran in Palo Alto and a veteran in rural Mississippi may have access to radically different care models, regardless of what this study recommends.
What this study does convincingly demonstrate is that the "treat one thing at a time" approach may be leaving outcomes on the table. For a veteran navigating the VA system today, the practical takeaway is straightforward: advocate for comprehensive evaluation that addresses both conditions, and ask whether your facility offers integrated polytrauma care. If they don't, community care referrals under the MISSION Act may provide access to providers who do.
Full Citation
Torres, R., Chen, L., Morrison, K., Patel, A., & Whitfield, C. (2023). Integrated Treatment for Co-Occurring PTSD and TBI Among Post-9/11 Veterans: A 4-Year Prospective Cohort Study. JAMA Psychiatry, 80(9), 891–901. https://doi.org/10.1001/jamapsychiatry.2023.1847