What is MOI?
refers to how a person was injured
What is the science of analyzing MOI’s called?
kinetics of trauma
*MOI is the 3rd consideration for transport, preceded by GCS
What is kinetics?
branch of mechanics dealing with movements of the body
What is the formula for kinetic energy? (the energy contained in a moving body)
Mass X Velocity squared and then divided by 2
Is mass or velocity a more important factor in determine how painful an injury is?
velocity because it is squared. a ball thrown at 2 ft per second hurts 4 times more than a ball thrown at 1 ft per second
What day the law of inertia state?
a body at rest will remain will at rest and a body in motion will remain in motion, unless acted upon by an outside force
What are the three types of impacts?
Vehicle Collision, body collision, and organ collision
List some MVA in which you should have a high index of sus?
-death of another occupant in a vehicle
-an unresponsive patient or a patient with AMS
-intrusion of greater than 12 inches for the occupant site including the roof or greater than 18 inches anywhere else to the vehicle
-ejection from the motor vehicle
-vechicle telemetry data consistent with a high risk of injury
why are head and neck injuries common in a lateral MVA?
they not built for ts. structures in the lateral neck aren’t strong and aren’t made to bend that way. the vertebrae cannot twist sideways much. also, heads collide with passages in cases. skull is thinnest in the temporal.
What are factors that influence the severity of injury in a vehicle-pedestrian collision?
-speed of vehicle
-point of impact for pedestrain
-distance pedestrain was thrown
-surface pedestrain landed on
-point of impact where pedestrain hit first on landing
Is it true children turn toward a vehicle in a MVA? (pedestrain situation but this is just also generally true)
yes. this makes it so most injuries suffered are from the front
where are the common areas a child are struck in a MVA?
combination of injuries to the femur, chest, abdomen, and head
Child have a low center of gravity, what does this do in a MVA?
they are typically thrown in front of the vehicle and and then subsequently run over
because in a MVA, adults turn away from the oncoming vehicle, where are injuries most common?
to the side, lateral. typically adults are struck in the legs causing fractures to the fibula and tibula, and then legs propelled forward cause them to fall backwards causing injury to the back, chest, shoulders, arms, and abdomen. they may in cases continue moving up the hood and impact the windshield, causing head injury and neck injury and then finally they are thrown off the car.
what are the 3 main types of impact in motorcycle collisions?
head-on, angular, and ejection
motorcycles: what is head on impact?
when the motorcycle tilts forward and causes the rider to crash forward into his handlebarss
motorcycles: what is augular impact?
when the rider strikes an object at an angle, causing tearing of the body or ampuatation
motorcycles: what is ejection impact?
when the rider is thrown off the bike and impacts the ground. helmets protect the rider and without one, you are 300% more likely to die or suffer severe head injury. wear this along with other leather clothing and stuff to protect against soft tissue damage, AKA road rash
for a fall, what factors determine an injury serverity?
-distance
-floor material
-body part first impacted
for an adult, above how many feet is considered significant for a fall?
20 ft
for an child, above how many feet is considered significant for a fall?
10 ft or 2 to 3 times their height
*internal organ damage is common with falls
what is a silver cork fracture?
a fracture of the wrist bones
how does energy travel?
in a straight line until it is forced to curve, leading to dissipate
what are the two factors that determine damage for a medium or high velocity injury?
trajectory and dissipation of energy
*a bullets trajectory typically follows a curve but the faster the bullet, the flatter the trajectory
