Mr. Allen a 19-year-old college student, was rock climbing when he fell 30 feet to the ground. Paramedics arriving at the scene found him lying in the supine position, unable to move his extremities and complaining of neck pain and reported loss of sensation in both his upper and lower limbs. He is awake, alert and oriented to place, person and time. He can provide details about the fall. On assessment, his pupils were equal and reactive to light. He has no visible head injuries, apart from minor abrasions on his arms. His vital signs: BP 110/72 mmHg, RR 18 bpm, HR 82 b/m, SpO2 95% on room air. The paramedics suspected him of having a spinal cord injury.

Which of the following is a primary mechanism of spinal cord injury that may have occurred in Mr. Allen’s fall?

Question

Mr. Allen a 19-year-old college student, was rock climbing when he fell 30 feet to the ground.  Paramedics arriving at the scene found him lying in the supine position, unable to move his extremities and complaining of neck pain and reported loss of sensation in both his upper and lower limbs.  He is awake, alert and oriented to place, person and time.  He can provide details about the fall.  On assessment, his pupils were equal and reactive to light.  He has no visible head injuries, apart from minor abrasions on his arms.  His vital signs:  BP 110/72 mmHg, RR 18 bpm, HR 82 b/m, SpO2 95% on room air.  The paramedics suspected him of having a spinal cord injury.

Which of the following is a primary mechanism of spinal cord injury that may have occurred in Mr. Allen’s fall?

BlackTom AI · Accepted Answer

Axial loading with vertebral compression is the most likely mechanism given a 30-foot fall producing immediate paralysis and sensory loss in all four limbs.

1. Relevant knowledge points and concepts
- Mechanisms of traumatic spinal cord injury include compression (axial load/burst fractures), flexion/extension injuries, distraction, rotational/shear forces, penetrating trauma, and ischemic/secondary injury.
- Clinical correlation: loss of motor and sensory function in both upper and lower limbs suggests a cervical spinal cord lesion (quadriparesis/plegia). Intact consciousness and reactive pupils make significant traumatic brain injury less likely.
- Compression injuries often occur with high-energy vertical impacts (falls onto feet/axial load) or direct blow, causing vertebral body fracture fragments to impinge on the cord.

2. Step-by-step reasoning process
- Fall from 30 feet is high-energy; common resulting mechanisms are axial compression or burst fractures.
- Patient is supine, unable to move extremities with loss of sensation in both upper and lower limbs → a bilateral, cord-level (not peripheral) lesion.
- Pupils equal/reactive and patient oriented → central brain injury (concussion) unlikely, focal signs localize to the spine.
- Therefore a primary spinal mechanism that produces immediate global limb deficits is compression of the cord by fractured/displaced vertebrae or bone/hematoma.

3. Intermediate steps / inference details
- High fall → axial force transmitted along spine.
- Axial force → vertebral compression or burst fracture.
- Fracture fragments or acute edema/hematoma → direct compression of spinal cord.
- Cord compression at cervical level → motor and sensory loss in all limbs.

4. Why the correct answer is correct
Compression due to direct trauma explains the immediate, bilateral sensorimotor loss and fits the injury biomechanics (high fall, axial load). It is a primary mechanical cause of cord dysfunction distinct from secondary ischemic processes.

5. Why other options are incorrect
- Musculoskeletal injury without neurological involvement would not produce loss of sensation and paralysis.
- Concussion (closed head injury) typically causes altered consciousness, cognitive changes, or focal cranial nerve signs; this patient is alert and oriented with no head trauma.
- Peripheral nerve injuries produce focal deficits in distribution patterns, not simultaneous bilateral upper and lower limb loss consistent with a central cord lesion.

6. Conclusion
Compression of the spinal cord due to direct trauma is the primary mechanism that best explains Mr. Allen’s presentation; this matches the provided correct answer.

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