Related Experiment Video
Updated: May 24, 2026

System for Focal, Closed-System Central Nervous System Injury
Published on: November 29, 2024
Injuries before and after deployments to Afghanistan and Iraq
J J Knapik1, A Spiess, T Grier
1US Army Institute of Public Health, Aberdeen Proving Ground, MD 21010, USA. joseph.knapik@us.army.mil
Objective:
To examine outpatient injuries before and after deployments of elements of the 10th Mountain Division to Afghanistan (n = 505 men) and the 1st Cavalry Division to Iraq (n = 3242 men).
Study Design:
Observational.
Methods:
The military units provided a list of deployed soldiers, and soldiers' outpatient medical encounters were obtained from the Defense Medical Surveillance System. Cumulative injury incidence was examined for two consecutive 90-day periods before the deployments (Periods 1-2) and two consecutive 90-day periods after the deployments (Periods 3-4).
Results:
Both groups showed post-deployment increases in the overall incidence of injury (Afghanistan group = 14.1%, 14.1%, 16.4, 23.4%; Iraq Group = 15.1%, 12.4%, 35.4%, 43.4%; Periods 1-4, respectively). Soldiers with pre-deployment injuries were 1.4-3.0 times more likely to experience post-deployment injuries.
Conclusions:
This study found a post-deployment increase in the incidence of outpatient injury. Also, soldiers with pre-deployment injuries were more likely to experience post-deployment injuries.
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