Definition & Operational Usage of Mechanism of Injury
What Is Mechanism of Injury?
Mechanism of Injury (MOI) is the environmental method and physical force distribution — such as fall height, vehicle rollover, ejection, speed, or blunt impact location — that caused traumatic injury to a patient.
Why Mechanism of Injury Matters on the Fireground
MOI serves as an early triage filter under CDC Field Triage Guidelines. Identifying a high-risk MOI (e.g., fall > 20 feet, passenger compartment intrusion > 12 inches) triggers direct transport to a Level 1 Trauma Center even before vital signs drop.
Relevant NFPA Standards
- NREMT Standards: National Registry of Emergency Medical Technicians Practice Standards
- NFPA 455: Standard for Emergency Medical Services (EMS)
Field Procedures & Tactical Steps
- Observe physical scene cues upon arrival (windshield starring, steering wheel deformation, fall height).
- Gather MOI details from patient, bystanders, or law enforcement.
- Compare MOI against CDC Field Triage Decision Scheme criteria for trauma center transport.
- Correlate MOI with expected anatomical injury patterns (e.g., lap belt mark = small bowel rupture).
- Report detailed MOI factors during trauma center pre-notification radio report.
Common Context & Application
Evaluated during initial scene size-up on all trauma, MVC, industrial accident, and fall calls.
Frequently Asked Questions about Mechanism of Injury
What fall height is classified as a severe MOI for adults under CDC guidelines?
Why is passenger compartment intrusion significant in car crashes?
Other Names for Mechanism of Injury
Mechanism of Injury may also appear in training materials, NFPA standards, or department SOPs as: Injury mechanism, Trauma mechanism.
Relevant Tools
Operational calculators related to Mechanism of Injury: