Wounds

📚 Definition of a Wound

✅ Legal Definition:

A wound (in legal terms) is defined as a complete breach of the skin.

• This means both the outer layer (epidermis) and inner layer (dermis) must be broken.
  
  

• Injuries such as internal organ rupture (like a burst spleen from a car crash) or a closed bone fracture (no skin break) are not legally considered wounds.
  
  

🔎 Important: A wound does not require a weapon to be involved.

✅ Medical Definition of Injury:

An injury is any damage to any part of the body resulting from mechanical force.
This can be due to:

• Impact (e.g., punch),
  
  

• Sharp object (e.g., knife),
  
  

• Acceleration/deceleration (e.g., whiplash).
  
  

🧾 Recording and Describing Injuries

In forensic and medical documentation, accuracy is crucial. Use standard terms (nomenclature).

Key Descriptors:

1. Site: Where on the body? Measure from fixed points (like elbows or nipples).
   
   

2. Size: Measure length, width, and depth of the wound.
   
   

3. Shape: Circular, linear, V-shaped, etc.
   
   

4. Margins: Are the edges clean, ragged, bruised?
   
   

5. Colour: Red, purple, green (useful for dating bruises).
   
   

6. Other signs: Swelling, redness (erythema), healing scabs, or pus.
   
   

7. Foreign material: Dirt, fibers, hair, blood, etc.
   
   

8. Visual aids: Use photographs, body charts, and drawings.
   
   

⚔️ Types of Injuries

✅ 1. Kinetic Injuries (due to mechanical force)

• Blunt Force (e.g., punch, fall)
  
  

• Sharp Force (e.g., knife)
  
  

• Ballistic (e.g., gunshot)
  
  

✅ 2. Non-Kinetic Injuries

• Thermal: Burns (heat or cold)
  
  

• Electrical: High voltage exposure
  
  

• Chemical: Acid attacks or toxic spills
  
  

💥 BLUNT FORCE INJURIES

1. Abrasions (Graze or Scratch)

• Caused by tangential force or friction.
  
  

• Affects only the superficial layer (epidermis); no full skin break.
  
  

• Little or no bleeding; exudes lymph (clear fluid).
  
  

• Tags of skin at wound edges can show direction of force.
  
  

🧬 Types of Abrasions:

• Crush abrasions: Vertical pressure (e.g., bite). May retain shape of object.
  
  

• Brush abrasions / Gravel rash: Lateral rubbing against rough surface.
  
  

• Fingernail abrasions:
  
  

  • Linear scratches = dragging fingers
    
    

  • Curved/short marks = gripping or holding
    
    

• Patterned abrasions: From an object impacting the skin at 90° (e.g., belt buckle).
  
  

• Post-mortem abrasions: Occur after death; may lack bleeding or tissue response.
  
  

2. Bruise (Contusion)

• Caused by rupture of blood vessels under intact skin.
  
  

• Blood seeps into tissues—visible as skin discoloration.
  
  

• Can occur deep in muscle or internal organs.
  
  

• Bruise size = force of impact.
  
  

• Bruises may move over time (follow gravity), and change colour as they heal:
  
  

  • Red → Blue → Green → Yellow → Brown
    
    

🔎 Post-mortem bruises can occur from rough handling, but lack internal bleeding or tissue reaction.

3. Laceration

• Skin is torn or split due to blunt force.
  
  

• Edges are irregular, ragged, crushed.
  
  

• May see “tissue bridges” — strands of intact connective tissue within the wound.
  
  

• Occur often over bony areas (e.g., scalp, shins).
  
  

• Less bleeding than sharp wounds.
  
  

• Often surrounded by bruising.
  
  

🔪 SHARP FORCE INJURIES

1. Incised Wounds (Cuts/Slashes)

• Wounds that are longer than they are deep.
  
  

• Made by sharp objects: knives, razors, broken glass.
  
  

• Clean, straight edges.
  
  

• Profuse bleeding due to severed blood vessels.
  
  

• Usually not deep enough to be fatal unless over arteries or neck.
  
  

2. Stab Wounds

• Deeper than they are long.
  
  

• Instruments: Knife, glass, scissors, screwdriver.
  
  

• The depth can exceed the visible blade length, especially if full force is used.
  
  

• The wound shape does not exactly match the blade due to movement or twisting.
  
  

• Most common cause of homicide in the UK.
  
  

3. Defence Wounds

• Occur when a person tries to protect themselves during an assault.
  
  

• Typically seen on:
  
  

  • Hands, forearms, fingers.
    
    

• May be cuts, bruises, or lacerations.
  
  

• Provide forensic evidence of struggle or assault.
  
  

⚡ NON-KINETIC INJURIES

1. Thermal Injuries

• From extreme heat or cold (burns or frostbite).
  
  

• May show blisters, charring, or red patches.
  
  

2. Electrical Injuries

• Entry and exit wounds with internal nerve or muscle damage.
  
  

• Often occur in accidents or torture cases.
  
  

3. Chemical Injuries

• From exposure to acid, alkali, or toxic substances.
  
  

• Often deeper than they appear.
  
  

• May cause tissue necrosis (death), burns, or disfigurement.
  
  

✅ Conclusion

The accurate identification, description, and classification of wounds are essential in:

• Medical treatment
  
  

• Legal investigations
  
  

• Forensic analysis
  
  

Each wound tells a story—how it occurred, when it occurred, and possibly even who caused it. Understanding the difference between types of injuries, especially in a legal or forensic setting, can determine whether a death was accidental, suicidal, or homicidal.