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Mechanism of Injury

Mechanism of Injury. Basic Trauma Course. Mechanism of Injury.

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Mechanism of Injury

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  1. Mechanism of Injury Basic Trauma Course

  2. Mechanism of Injury • Mechanism of injury (MOI) can be defined as an exchange of forces that results in an injury to a person. Mechanism of injury more accurately describes both the force and subsequent tissue response. The actual injury occurs when the force deforms tissues beyond their respective abilities to compensate, absorb, or diffuse the energy. • . Sir Isaac Newton's Law of Inertia is probably the most important concept: 'A body in motion will remain in motion unless acted upon by an outside force'. • Law of Conservation of Energy, which states: Energy can neither be created or destroyed. It is only changed from one form to another.

  3. Kinetic Energy • Kinetic energy is dependent upon an object’s mass and its velocity (speed). As speed increases, kinetic energy increases exponentially. • When an impact occurs and the energy is transferred to another object, the energy is described as a force. • The most common forces encountered in traumatic injury are Acceleration, Deceleration, and Shear forces.

  4. Typical Patterns of Injury • MVC • Motor cycle crash • Auto versus pedestrian • Explosive blast injuries • Falls from significant heights

  5. What questions do we ask? • Vehicle Collisions • Type of crash • Location in the vehicle • Type of seat belt worn (Lap belt vs. three point restraints) • Presence and deployment of airbags (frontal, side impact) • Whether a helmet was worn (Motorcycle or bicycle) • Speed of vehicle at impact • Whether rapid deceleration occurred • What was hit • Interior and exterior damage to the vehicle, including a spider type configuration on the windshield from the inside • Intrusion into the passenger compartment of the vehicle • Whether the patient hit the steering wheel, dashboard, or windshield • Condition of steering wheel, dashboard (bent, indented), and windshield • Evidence of vehicle rollover, and if so, approximately how many times.

  6. What questions do we ask? • Gunshot wounds or stabbings • Type of weapon (Type of knife or firearm) • Caliber of bullet • Length of knife • Position of patient when event occurred • Falls • Height of fall • What the patient landed on • Impacted body parts

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