Man hit by car is thrown up and hits road divider falls on the ground sustains head injury then run over by another car. Cause of head injury:
**Core Concept**
The question is testing the understanding of the mechanism of head injury, specifically the sequence of events that can lead to traumatic brain injury. The correct answer requires knowledge of the pathophysiology of head trauma and the impact of different types of forces on the brain.
**Why the Correct Answer is Right**
The correct answer is due to the mechanism of acceleration-deceleration injury. When the man is thrown up and hits the road divider, he experiences a sudden acceleration, which is then followed by a deceleration as he falls to the ground. This rapid change in velocity can cause shearing forces within the brain, leading to injury. The impact of the second car further exacerbates the injury, causing a coup-contracoup injury, where the force is transferred to the opposite side of the brain.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because it doesn't specify the mechanism of injury, which is a critical aspect of understanding head trauma.
* **Option B:** This option is incorrect because it doesn't take into account the sequence of events that led to the head injury.
* **Option C:** This option is incorrect because it doesn't provide a clear mechanism of injury, and the term "re-impact" is not a standard medical term.
**Clinical Pearl / High-Yield Fact**
The mechanism of acceleration-deceleration injury is a classic exam trap, and it's essential to consider the sequence of events that led to the head injury. Remember the phrase "ABCDE" to help you remember the sequence of events: A - acceleration, B - blunt force trauma, C - change in velocity, D - deceleration, and E - exacerbation of injury.
**Correct Answer:**
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