Ring fractures of the base of skull are characterised by a circular fracture line surrounding the foramen magnum. They are MOST commonly caused by:
- A Direct blow to the vertex of the skull with a heavy blunt object
- B Falls from a height landing on the feet or buttocks, transmitting axial force through the spine to the occiput ✓
- C Gunshot entry at the occiput
- D Rapid deceleration in motor vehicle accidents causing contrecoup injury
Correct answer: B. Falls from a height landing on the feet or buttocks, transmitting axial force through the spine to the occiput
Explanation
Ring fractures of the skull base surrounding the foramen magnum occur from axial loading forces transmitted upward through the vertebral column when the victim lands on the feet, buttocks, or the top of the head in falls from a height. The upward thrust of the spine drives the occipital condyles through the base, producing this characteristic ring. They are not caused by direct vertex blows, gunshots, or horizontal deceleration forces, which produce different fracture patterns.
Reference: The Essentials of Forensic Medicine and Toxicology (Narayan Reddy), 34th ed.
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Written and medically reviewed by the StethoPrep medical team.