In a stab wound caused by a double-edged blade, what is the characteristic appearance of the wound margins?

Explanation

## Stab Wound Margin Characteristics by Blade Type ### Double-Edged Blade Stab Wounds - **Both margins are sharp and clean** — the defining feature - Each edge of the blade creates a clean incision as it penetrates - Results in a symmetrical wound with two sharp margins - Tissue bridging may be present across the depth of the wound - No abraded or irregular margins - Minimal tissue loss at the margins ### Comparison Table: Stab Wound Margins by Blade Type | Blade Type | Margin Appearance | Number of Sharp Margins | Tissue Bridging | Forensic Significance | |---|---|---|---|---| | Double-edged (dagger, bayonet) | Sharp, clean on both sides | 2 | May be present | Symmetrical wound | | Single-edged (knife) | One sharp, one abraded | 1 | May be present | Asymmetrical wound | | Blunt-tipped (ice pick) | Abraded on all margins | 0 | Usually absent | Minimal tissue damage | **Key Point:** The number of sharp margins in a stab wound directly correlates with the number of sharp edges on the weapon — a double-edged blade produces two sharp margins. **High-Yield:** Forensic pathologists use margin characteristics to determine the type of blade used in a stabbing. This information is crucial for weapon identification and reconstruction of the crime. **Clinical Pearl:** Tissue bridging (strands of tissue spanning the wound depth) occurs when the blade separates tissues without completely severing them, and is more likely in deep stab wounds with a small surface opening. **Mnemonic:** **Double-edged = Double sharp margins** | **Single-edged = Single sharp margin + abraded margin**