Injuries and Wounds: Types, Medicolegal Importance and Gunshot Wounds

Mechanical injuries split into blunt-force and sharp-force families. Both are routine entries in mortuary registers at AIIMS Delhi, KEM Mumbai, and district government medical colleges.

Blunt-force injuries. Three types appear in every textbook. An abrasion is a superficial injury limited to the epidermis, produced by friction. Subtypes are graze or scratch(linear, tangential),pressure abrasion(the seatbelt mark across a chest, or the ligature mark in hanging),imprint or patterned abrasion(the tread of a tyre, the weave of a fabric, the grille of a vehicle) and postmortem abrasion(yellow, parchment-like, no vital reaction). Abrasions are the most reliable wound for showing the direction of force. A contusion or bruise is extravasation of blood into subcutaneous tissue from ruptured capillaries with the skin intact. Age is estimated by colour: red within hours, blue or purple at 1 to 3 days, green at 4 to 6 days, yellow at 7 to 12 days, fading brown to clearing over 14 days or so. The colour sequence reflects haemoglobin breakdown (haemoglobin to biliverdin to bilirubin to haemosiderin). A laceration is a tear or split produced by blunt force; the margins are irregular and contused, hair bulbs are crushed, and the diagnostic feature is bridging tissue strands of blood vessels, nerves or connective tissue that remain intact across the wound base because they are more elastic than skin. Lacerations bleed less than incised wounds of similar size.

Sharp-force injuries. Three types again. An incised wound is produced by a sharp-edged weapon (knife, razor, glass shard) drawn across the skin;length is greater than depth the edges are clean, regular and everted, no bridging, and bleeding is profuse. A stab or punctured wound is produced by a pointed weapon thrust into the body;depth is greater than length on the skin surface, and the skin defect roughly mirrors the cross-section of the blade (so a single-edged knife gives one acute and one blunt angle, a double-edged blade gives two acute angles). Stab wounds are the strongest morphology for inferring weapon dimensions and reconstruction. A chop wound is a combination injury from a heavy edged weapon such as an axe, kulhari or sword: it is part-incised at the edges and part-lacerated where the weight of the weapon crushes adjacent tissue and often underlying bone. Chop wounds are common in dacoity and rural homicide entries.

The abrasion-colour-change line(red, blue, green, yellow, brown) is one of the most photographed stems in examiners papers and worth memorising as a single string.

Burns. The medical officer at a Mumbai or Delhi burns ward classifies burns by depth and extent. Depth is graded into four degrees on the older Dupuytren scale or three on the modern (superficial, partial-thickness, full-thickness) scale.First degree is erythema (sunburn-like),second degree is vesication or blistering with intact dermis, third degree is full-thickness with destruction of dermis and appendages, fourth degree extends to deep tissues including muscle and bone. Extent is measured by Wallace's Rule of 9 in adults: head and neck 9 percent, each upper limb 9 percent, anterior trunk 18 percent, posterior trunk 18 percent, each lower limb 18 percent, perineum 1 percent. Children get a different chart because the head is proportionally larger. Burns greater than 40 percent are typically grievous and life-endangering; survival depends on age, comorbidities and burn-unit access.

Scalds are injuries by hot liquid or steam (below 100 degrees C); blisters are common and hair is usually not singed.Dry burns are from flame or hot solids; hair is singed and clothing may be involved. Dowry-death and bride-burning cases under BNS 2023 Sections 79, 80, and 117 turn on whether the burn pattern is consistent with the history given.

Antemortem versus postmortem burns are tested every cycle. Antemortem signs include the line of redness at the burn margin (hyperaemia),vesicles with serous fluid and high protein and chloride contentsoot in the airway and stomach(inhaled while breathing),carboxyhaemoglobin (COHb) greater than 10 percent in blood (an unambiguous proof of inhalation of fire gases), and reparative changes such as scab, granulation or epithelialisation in survivors. The presence of COHb above 10 percent at autopsy is the single strongest evidence the person was alive in the fire. Absence of soot in the airway and a COHb less than 10 percent points to a body burnt after death, a finding the prosecution leans on in staged-suicide cases.

Electrical injuries. Contact with a live conductor produces a Joule burn or electric mark at the entry: a small, firm, depressed, greyish-white area with a raised margin, sometimes with metallisation of the skin. An exit point appears where current leaves the body, often a foot in barefoot electrocution.Flash burns are surface burns from the arc without direct contact; clothing may ignite. Cause of death is usually ventricular fibrillation (50 to 60 Hz mains AC at the heart) rather than thermal injury. Domestic electrocution is a common forensic entry from rural and semi-urban India, and BNSS 2023 Section 194 inquest paperwork (Form 21) is the procedural anchor.

The statutory frame moved from the Indian Penal Code to the Bharatiya Nyaya Sanhita 2023 with effect from 1 July 2024. The historical IPC Sections 319 to 326 map almost one-to-one to BNS 2023 Sections 114 to 118.

BNS 2023 Section 114 (Hurt defined)."Whoever causes bodily pain, disease or infirmity to any person is said to cause hurt." This is the base definition; corresponds to IPC Section 319.

BNS 2023 Section 115 (Voluntarily causing hurt). Whoever does any act with the intention or knowledge of causing hurt is said to voluntarily cause hurt; punishable with imprisonment up to one year or fine up to ten thousand rupees or both. Corresponds to IPC Sections 321 and 323.

BNS 2023 Section 116 (Grievous hurt defined). Lists the eight clauses that elevate simple hurt to grievous hurt, and every aspirant should memorise them as a single block: (1)Emasculation(2)Permanent privation of sight of either eye(3)Permanent privation of hearing of either ear(4)Privation of any member or joint(loss of a limb or finger), (5)Destruction or permanent impairing of the powers of any member or joint(6)Permanent disfiguration of the head or face(7)Fracture or dislocation of a bone or tooth(8)Any hurt which endangers life or which causes the sufferer to be during the space of twenty days in severe bodily pain, or unable to follow his ordinary pursuits. Corresponds to IPC Section 320.

BNS 2023 Section 117 (Voluntarily causing grievous hurt). Imprisonment up to seven years and fine; corresponds to IPC Sections 322 and 325.

BNS 2023 Section 118 (Voluntarily causing hurt or grievous hurt by dangerous weapons or means). Hurt or grievous hurt caused by any instrument for shooting, stabbing or cutting, or any instrument that used as a weapon is likely to cause death, or by fire, heated substance, poison, corrosive substance, explosive substance or any animal; punishable with imprisonment up to ten years and fine. Corresponds to IPC Sections 324 and 326.

Reference case.Virsa Singh v. State of Punjab (AIR 1958 SC 465)is the Supreme Court's classical test for when intentional grievous hurt that causes death becomes culpable homicide amounting to murder under (now) BNS 2023 Section 101 / 103. The court laid down four ingredients: an objective bodily injury, the nature of the injury proved, the injury intended (not accidental or unintentional), and that the injury was sufficient in the ordinary course of nature to cause death. The Virsa Singh test is the standard judicial framework for this question and is cited in forensic-medicine practice and teaching.

Distinguishing antemortem from postmortem injury is among the most courtroom-relevant skills a medical officer demonstrates at autopsy, resting on a defined list of vital reactions.

Vital reactions (antemortem signs).Haemorrhage and clotting with retracted vessel ends are the strongest single sign; arterial spurting indicates injury in life.Eversion of wound edges(because of skin tension while living tissue is elastic).Hyperaemia and inflammatory redness at margins within minutes to hours.Swelling and infiltration of subcutaneous tissue.Scab formation within hours to a day.Inflammation and infection signs over days (leucocyte infiltration, granulation tissue, pus). Histology shows leucocytic margination within 30 minutes to 4 hours, fibrin within 4 to 8 hours, and capillary buds within 24 to 48 hours; a forensic histopathologist at AIIMS Delhi or NIMHANS Bangalore can date a wound on these criteria.

Postmortem injury features. Pale, yellow, dry, parchment-like surface (especially for postmortem abrasions). Little or no bleeding. Wound edges gape less and lack eversion. No clot retraction. No inflammation, no scab, no healing. Postmortem incised wounds may bleed slightly from dependent areas because of postural pooling, which can confuse the inexperienced examiner.

The soot in airway and carboxyhaemoglobin thresholds described in Section 2 are the burn-specific vital reactions. For drowning, the diatom test is the classical antemortem indicator; for hanging, the line of redness under the ligature mark and subcutaneous haemorrhage in neck muscles are the vital signs.

Whether an injury was sustained, self-inflicted, or fabricated is a question the trial court routinely asks of the medical officer.

Defence wounds. Wounds sustained while warding off an attack. Typical sites are the palms and fingers(grabbing the blade), the ulnar borders of the forearms(raised to shield the face), and the back of the hand and forearm(turned outward against blows). Incised defence wounds are common against knife attacks; lacerations and fractures of the ulna ("nightstick fracture") are common against blunt weapons such as a lathi. The presence of defence wounds is strong evidence the victim was conscious and resisting, which excludes a sleeping or already-unconscious victim hypothesis.

Self-inflicted wounds. Typical patterns: multiple hesitation or tentative cuts parallel to the deeper main wound, all on accessible sites(front of wrist, front of neck, anterior chest in the non-dominant hand's reach), avoidance of sensitive structures(eyes, lips, nipples, genitals are spared), uniform direction and depth, and absence of defence wounds elsewhere. The classical Cantle-Buntin / Modi signs of self-infliction that Indian textbooks tabulate are: accessible site, sparing of clothing (clothes lifted before cutting), multiple superficial parallel hesitation marks, uniform direction, and a credible psychiatric or motive history (insurance, false complaint, evasion of duty).

Fabricated (fictitious) wounds. Self-produced or third-party-produced wounds designed to support a false complaint of assault, robbery or rape. The classical clue set is the same as for self-inflicted wounds plus inconsistency with the alleged story (clothing intact while skin underneath is cut), absence of corresponding clothing damage, and recovery far quicker than the alleged severity suggests.State of Maharashtra v. Mohd. Yakub and similar cases hinge on whether the medical evidence supports the prosecution's narrative or exposes fabrication.

Gunshot wound morphology is concise and visually unambiguous, making the entry-versus-exit distinction a reliable reference table. The morphology connects to firearms examination and to BNS 2023 Section 113 (terrorist act) and Section 109 (attempt to murder by firearm).

Entry wound. Round to oval defect with inverted edges(skin pushed inward by the bullet), surrounded by a 1 to 3 mm abraded collar(rim of grazed epidermis caused by the bullet stretching and scraping skin on entry), often with a grease or dirt collar just inside the abrasion (lubricant and powder residue wiped from the bullet onto the skin). The defect is usually smaller than the bullet diameter because of skin elasticity. In contact and close-range shots, additional features appear (see range below).

Exit wound. Irregular, stellate or slit-like defect with everted edges(skin pushed outward as the bullet leaves),no abraded collarno grease collarno soot or tattooing. The exit may be larger than the entry because of bullet tumbling and tissue or bone fragments riding the bullet. Bone exit defects show a cone of beveling outward, the inverse of the inward beveling seen at the entry side of skull bone.

Range of fire. The standard four-step continuum is the staple stem.

• Contact shot (muzzle pressed against skin). Round entry with muzzle imprint(abrasion pattern of the front sight, muzzle and gas port),stellate or cruciate tearing of skin (especially over bone, because gases trapped under the skin explode it outward),soot deposited inside the wound track cherry-red discolouration from carboxyhaemoglobin in the burnt tissue.
• Close range (a few cm up to about 60 cm).Soot or smoke blackening around the entry up to about 30 cm (depending on weapon, ammunition, barrel length), plus tattooing or stippling(unburnt powder grains driven into skin) extending out to about 60 cm. Soot can be wiped off; tattooing cannot.
• Intermediate range (about 60 cm to 1 m). Tattooing fades; soot is absent. Abraded collar and grease collar persist.
• Distant range (beyond 1 m). Only the entry defect with abraded collar and grease collar; no soot, no tattooing. Pellet dispersion patterns apply for shotguns (see below).

Gunshot residue (GSR). Primer residues (lead, barium, antimony for non-lead-free primers) deposit on the firing hand and on surfaces near the muzzle. Detection by SEM-EDX and ICP-MS is the standard. GSR analysis details belong to the related topic on Gunshot Residue Analysis.

Shotgun pellet dispersion. A shotgun fired at contact range produces a single ragged hole. As range increases the shot column opens out: by about 1 m the pattern is still a single defect with scalloped edges, by 3 to 5 m the pellets form distinct satellite punctures around a central hole, and by 10 m the pattern is a wide scatter with no central hole. Pellet spread is a rough range estimator and is calibrated by test firing the same gun and cartridge at known distances. Cross-reference the dedicated sibling topic on Determination of Range in Firearm Casesfor the calibration tables.

BNS 2023 firearm context. Section 113 covers terrorist acts including those by firearms or explosives. Section 109 covers attempt to murder; Section 103 covers murder; Section 100 to 106 cover the homicide spectrum. The medical officer's gunshot-wound description, when read with ballistic analysis from a CFSL or SFSL firearm unitand BSA 2023 Section 39 expert opinion, builds the chain that takes a recovered weapon to a conviction.