This document provides definitions and descriptions of different types of wounds and injuries for forensic examination purposes. It defines wounds as disruptions of tissue caused by force and distinguishes between wounds, which imply deliberate action, and injuries, which can be accidental. It then describes in detail the characteristics of different types of injuries including bruises, abrasions, lacerations, stab wounds, incised wounds, and how to examine and document wounds. Factors like wound size, shape, location, and color changes over time are discussed to help determine the causes and timing of injuries.

1. Dr. Neeraj Kumar Jain
Department of Surgery

3. Wounds and injuries
DEFINITION
Disruption of the normal structure of tissues
caused by the application of force.

4. Wounds and injuries
Legal definition of a wound
a wound is where the whole skin is broken,
the continuity of the skin broken.
An abrasion of the surface is not sufficient.
Splits of the inside of the mouth are included
but not fractures or internal injuries
if the overlying skin is intact.

5. Wounds and injuries
A wound implies a deliberate action
while an injury can be caused accidentally.

6. Interpretation of injuries
This is the most important part of the forensic examination
The nature of the agent(s) causing the injuries
may be identified in general terms
e.g. due to a blunt object or a sharp object.
The pattern of the injuries on the body
may help in deciding the circumstances
in which the injuries occurred,
accident, suicide or homicide.

7. 1.The nature of the wound, ie whether it is a
bruise, abrasion or laceration etc
2.The wound dimensions, eg length, width,
depth etc.
3.It is helpful to take a photograph of the
wound with an indication of dimension (eg a
tape measure placed next to the wound),
4.Measurements to be taken of the wound as it
appears first, and then with wound edges
drawn together
Describing injuries

8. 5.The position of the wound in relation to fixed
anatomical landmarks, eg distance from the
midline, below the clavicle etc
6.The height of the wound from the heel (ie
ground level) - this is particularly important in
cases where pedestrians have been struck by
motor vehicles
Describing injuries

9. Blunt force injuries
Abrasions
Bruises
Lacerations

10. Injuries due to sharp or long
instruments
Incised wounds
Stab wounds

11. Bruise
 Crushing of tissues
 epidermis uninjured
 connective tissue crushed
 small vessels ruptured and bleed into tissues
 common in young and old, haematological problems
 falls, assaults

12. •Bruises are caused by blunt trauma / injury to tissues,
resulting in damage to blood vessels beneath the surface.
•Blood leaks out ('extravasation') into surrounding tissues
from damaged capillaries, venules and arterioles.
•Bruises may be surface bruises, or deeper within tissues or
organs.
Bruises/ Contusions

13. •Unlike abrasions, the characteristics of the object causing a
bruise cannot easily be determined, because blood tends to
spread out in a diffuse manner from the site of injury,
particularly along fascial planes.
•'shifting' of bruises after time. For example, from faace or
scalp to neck
•Bruises may also 'appear' after some days due again to the
same phenomenon of blood tracking along tissue planes, and
pathologists often re-examine a body again to look for such
bruising.
Bruises/ Contusions

14. Intra-dermal bruises, however, provide an exception to
this general rule, as they are superficial - lying just under
the epidermis.
In this case, there may be good correlation between the
bruise seen and the characteristics of the causative object
e.g. tramline bruises.
Bruises/ Contusions

15. Ecchymoses/ purpura - smaller than a few
millimeters
petechiae - pinpoint bruises(usually due to venous
engorgement, e.g. in asphyxia, or in defects in blood
coagulation such as Disseminated Intravascular
Coagulation (DIC)).
Senile purpura – flat purple bruises in elderly
Bruises/ Contusions

16. A blow from an object may give rise to a combination of
injuries, such as a bruise with an abrasion etc, and different
parts of the body are more susceptible to bruising than
others.
For example, the skin over the eyelids bruises easily, whilst
the tougher palmar surface or plantar surface rarely bruises,
unless severe direct trauma e.g. fall from a height or torture.
Bruises/ Contusions

17. The positioning of bruising is significant e.g. multiple rows of
spherical/ disc shaped bruises may be seen when an attempt is
made to strangle someone with bare hands (manual
strangulation).
The bruises are caused by the attacker's fingertips pressing
into the skin.
Bruises/ Contusions

18. 'Tramline' bruises
Consist of two parallel linear bruises separated by a paler,
undamaged section of skin.
This type of injury occurs when the skin is struck with a rod
shaped object, which squeezes blood from the vessels at the
point of inpact, thus emptying them and preventing them from
leaking blood. The edges of the wound are stretched, and
blood vessels are torn, causing blood to leak into the
surrounding tissues.
A similar phenomenon is seen when the injury is caused by a
hard spherical object, such as a squash ball !
Bruises/ Contusions

19. Abrasions
 Surface injury
 graze or scratch
 rough surface striking the body tangentially
 crushed epidermis, pressure or imprint abrasions
 examples: ligature mark, fingernail scratches, tyre
marks, ground or gravel injuries e.g. grazed knees

20. An abrasion is a superficial injury, commonly known as a
'graze' or 'scratch'.
This type of wound damages only the epidermis
(uppermost skin layer), and should not therefore bleed.
However, abrasions do usually extend into the dermis
causing slight bleeding.
Abrasions

21. Abrasions are commonly caused by a 'glancing' impact across
the surface of the skin,
If the force is directed vertically down onto the skin surface it
may be termed a 'crush' injury.
These wounds are seen where an object has struck the skin (eg
a kick), or where the injured person has fallen onto a rough
surface, such as road.
Abrasions

22. Abrasions may be 'linear', a 'scratch'
If broader surface is affected, it is called a 'graze' or 'brush
abrasion' (eg where a motorcyclist is thrown from their
vehicle, and comes into contact with the road surface in a
skidding fashion). Such an abrasion often covers a relatively
large area of skin, and is often called a 'friction burn’.
Abrasions

23. If the surface of an abrasion is examined closely, for example
with a hand-held magnifying glass, the direction of force can
often be determined, from the torn epidermis.
Strands are drawn towards the end of the injury, and are 'heaped
up'.
The edges of the wound may also be ragged and directed
towards the end of the wound.
Abrasions

24. Of particular importance in the forensic setting is the fact that
abrasions can retain much of the surface characteristics of the
object that caused the wound.
For example, there may be a patterned abrasion caused by an
element of a vehicle involved in a 'hit-and-run' (such as that
made by a radiator grill or bumper), and if the abrasion has
been fully documented and photographed (with a scale) and
the suspected vehicle is subsequently recovered, the two may
be matched up.
Abrasions

25. Lacerations
 Breach in epidermis and dermis
 crush injury
 common where skin stretched over bone, scalp,
face and shins
 margins bruised and abraded
 tissues not cleanly divided, tissue ‘bridges’ across
base of wound
 bleed profusely
 falls, kicks and blows from object

26. These wounds are commonly known as 'gashes, tears
or cuts' of the skin.
The skin surface is split or torn following blunt
trauma, and the force causes the full thickness of the
skin to be damaged.
Lacerations therefore bleed profusely.
Lacerations

27. Areas of the body that are commonly the site of lacerations
are those with underlying bony support, such as above the
eyebrows, on the scalp and face, or over the knees etc,
whilst they are less common on areas of the body that are
softer such as the buttocks.
Contact with motor vehicles may also cause splitting of the
skin due to grinding type movements over the surface, the
most severe being a ‘degloving’ injury.
Lacerations

28. Lacerations have ragged wound edges, as they have
been torn apart and not neatly incised as in a surgical
wound.
scalp lacerations sometimes resemble incised wounds
when they have been caused by a regular shaped
object.
If the wound is examined closely the ragged edges
can be visualised, along with crushing and bruising of
the margins, hairs driven into the tissues and tissue
strands crossing the depth of the wound (nerves, fibrous
brands, vessels)
Lacerations

29. Stab wounds
 Caused by long object
 penetrate body
 small surface wound, depth varies
 shape depends on object penetrating

30. .
These are wounds where the depth of injury is greater than the
length.
They penetrate more deeply than slash wounds and tend to come
into contact with vital organs in the chest and abdomen
Stab wounds are caused most obviously by knives,
but are also caused by bayonets and swords,
as well as scissors and even blunter instruments such as
screwdrivers.
Stab wounds

31. They are usually slit-like
When the object is removed the skin contracts
slightly, leaving a wound that is slightly shorter
than the blade width.
The centre of the wound often widens.
Stab wounds

32. Stab Wounds

37. Incised wound
 Due to sharp instruments
 length greater than depth
 wound margins uninjured
 deep tissues cleanly cut
 e.g. surgeon’s incised wound

38. Slash Wounds
These are wounds where the length is greater than the depth,
eg a slice wound across the skin.
If the wound involves major blood vessels, it can be life
threatening, but in general, they are not as serious as stab
wounds.
Incised wounds

39. Other injuries
 Weals
 Glass injuries
 Axe injuries
 Thermal injuries
 Firearm injuries
 Defence injuries
 Self-inflicted injuries

40. Miscellaneous
 Weals - triple response
 defence injuries - assaults; arms, hands, legs
 self inflicted - haphazard on arms or body in mental
disorders
 tentative injuries - suicide attempts; short, shallow
wounds on wrists or neck

41. Age of injuries
 Colour changes in bruises - purple to yellow
 scab formation in abrasions
 scabbing and scarring of laceration
 histological examination of tissues

42. Bruises change colour over time, because of the degradation of haemoglobin in the blood. However,
the timescale of this degradation is not fixed, and it is therefore possible only to give a rough
estimation of the age of the bruise. Colour changes are from dark blue or purple to blue, brown,
green and yellow

43. Bruises change colour due to degradation of haemoglobin
Timescale of this degradation is not fixed
Possible only to give a rough estimation of the age of the bruise.
Colour changes are from dark blue or purple to blue, brown, green
and yellow
In general, small bruises on an otherwise fit and healthy person,
could pass through the spectrum of colour changes between 72
hours and 1 week.
The more extensive, or deep seated the bruise, the longer it will
take to dissapear.
If a bruise is brown/ green or yellow it is likely that the injury is at
least 18 hours old
Markedly different coloured bruises suggest that they have been
caused at different times, and may indicate signs of chronic abuse,
such as of an infant etc.
Age of bruises

44. Death from injuries
 Haemorrhage
 damage to vital structure
 shock
 infection
 pulmonary thromboembolism
 acute tubular necrosis
 fat embolism

45. Thanks