In which of the following conditions are sparrow-foot marks characteristically observed?
- A.Electrocution
- B.Lightning injury
- C.Custodial torture
- D.Motor vehicle accident
Show answer and explanation
Answer: D. Motor vehicle accident
The correct answer is D. Motor vehicle accident.
Sparrow-foot marks (also called sparrow-foot lacerations) are multiple, small, bizarre punctate or L-shaped lacerations of the face seen in front-seat occupants of a vehicle. They are produced when shattered toughened windscreen glass strikes the face during a road traffic accident, and are a form of dicing injury. Classic trap: the look-alike is lightning, which produces Lichtenberg figures (arborescent, filigree, feathering or keraunographic marks). Those fern-like marks are pathognomonic of lightning but are NOT called sparrow-foot marks, so lightning is not the answer here.
Why the other options are incorrect:
- A. Electrocution: Produces Joule (endogenous) burns and electric marks at the contact points, not facial glass lacerations.
- B. Lightning injury: Produces Lichtenberg figures (arborescent, feathering marks), a fern-like pattern, not punctate facial lacerations. This is the intended trap.
- C. Custodial torture: Produces patterned inflicted injuries such as tramline contusions, not windscreen lacerations.
High-Yield Facts:
- Sparrow-foot marks are multiple punctate facial lacerations from shattered windscreen glass.
- They are a type of dicing injury and indicate a front-seat occupant in a road traffic accident.
- Lightning instead produces Lichtenberg figures (arborescent or filigree marks).
- Electrocution produces Joule burns at the contact points.
Option D (answer): shattered windscreen glass. When it strikes a front-seat occupant's face it produces the punctate sparrow-foot lacerations.
Option B (trap): a Lichtenberg figure, the arborescent feathering mark of lightning. This is NOT a sparrow-foot mark.
Option A: an electrical contact (Joule) burn, the typical mark of electrocution.
Summary: sparrow-foot marks (windscreen glass, RTA) versus the distractors, with the sparrow-foot vs Lichtenberg distinction highlighted.