Forensic Medicine · Mechanical Injuries (Blunt, Sharp, Regional Injuries)

A victim of assault shows two parallel linear bruises on the forearm separated by a central pale strip. Which object most likely caused this injury?

  • A A flat open palm
  • B A cylindrical stick or rod
  • C A chain
  • D A knuckle fist
Correct answer: B. A cylindrical stick or rod

Explanation

Tramline or railway track bruising occurs when a blow from a cylindrical implement such as a stick displaces blood laterally from the point of impact into two parallel lines at the margins, leaving the centre relatively pale. B palm produces a diffuse diffuse bruise, a chain leaves irregular patterned marks, and a fist gives a single ill-defined swelling rather than paired parallel lines.

Reference: Parikh's Textbook of Medical Jurisprudence and Toxicology, 7th ed.

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