Short Answer 
Tertiary blast trauma occurs when individuals are thrown by an explosion and collide with objects, leading to serious injuries like femur fractures and liver lacerations. Understanding the mechanism of these injuries, typically involving blunt force impacts, is crucial for effective medical treatment.
Step 1: Understanding Tertiary Blast Trauma
Tertiary blast trauma refers to injuries that occur when a person is thrown by the force of an explosion and hits surrounding objects. This type of injury typically arises during significant explosive incidents, where shockwaves and blast winds propel individuals into hard surfaces. It is essential to identify the mechanism of injury to establish appropriate interventions and treatments.
Step 2: Identifying Key Injuries from the Incident
In this scenario, the adult suffered a variety of serious injuries:
- Femur fracture – a break in the thigh bone indicating high impact.
- Liver laceration – a tear or cut in the liver, which can lead to internal bleeding.
- Subdural hematoma – bleeding between the brain and its outer covering, often resulting from head trauma.
Step 3: Analyzing the Mechanism of Injuries
The sustained injuries can be traced back to the impact of the individual being propelled against a hard surface, such as a concrete wall. This blunt force trauma results from the combination of the explosion’s shockwave and the subsequent collision with solid objects. Understanding this mechanism is vital for medical professionals when determining treatment options and addressing the various injuries simultaneously.