A 32-year-old man is brought to the emergency department following an altercation. He has a wound on his forearm measuring 6 cm in length with clean, sharp edges and minimal tissue damage. On the opposite side of the chest, he has a wound with irregular, jagged edges and surrounding tissue bruising. Which feature best distinguishes an incised wound from a stab wound?

Explanation

## Distinguishing Incised from Stab Wounds ### Key Morphological Differences | Feature | Incised Wound | Stab Wound | |---------|---------------|----------| | **Edge characteristics** | Clean, sharp, regular margins | Irregular, jagged, often with tissue crushing | | **Length vs. Depth** | Length > Depth (gaping wound) | Depth ≥ Length (penetrating wound) | | **Surrounding tissue** | Minimal damage, clean separation | Bruising, crushing, tissue trauma | | **Hemorrhage** | Profuse (vessels cleanly cut) | Variable; may be minimal if vessels compressed | | **Causative agent** | Sharp instrument (knife, glass) | Pointed instrument (stiletto, ice pick) | **Key Point:** An incised wound is produced by a sharp instrument moving across skin and underlying tissue with a single stroke. The defining feature is **clean, sharp edges with minimal surrounding tissue damage**. The wound gapes because elastic recoil of skin is unopposed. **Clinical Pearl:** In contrast, a stab wound is produced by a pointed instrument thrust into tissue. The edges are often irregular and bruised because the pointed instrument stretches and crushes tissue as it penetrates, rather than cleanly dividing it. **High-Yield:** The presence of **tissue crushing and bruising around the margins** is characteristic of stab wounds and helps differentiate them from incised wounds, which have pristine, clean edges. ### Why This Matters Forensically The wound morphology helps determine: - Type of weapon used - Direction and force of injury - Potential for self-infliction - Severity and prognosis [cite:Reddy's Forensic Medicine 34e Ch 8]