FM5.4-5 | Wound Healing, Examination & Certification — Summary & Reflection

KEY TAKEAWAYS

Wound healing progresses through haemostasis, inflammation, proliferation, and remodelling phases with established timelines that allow forensic dating. Histological dating landmarks: PMN infiltration peaks 24–48 hours; macrophage phase 2–5 days; fibroblast activity and early collagen 5–10 days; scar formation 2–4 weeks. Bone fracture healing follows: haematoma (24–48h), soft callus (2–6 weeks, first X-ray changes), hard callus (6–12 weeks), remodelling (1–2 years). Factors promoting healing include good vascularity, nutrition, and debridement; factors inhibiting healing include infection, diabetes, malnutrition, foreign bodies, steroids, and old age. Wounds cause death via primary causes (haemorrhage, vital organ injury, air embolism, traumatic shock — immediate) and secondary causes (septicaemia, tetanus, gas gangrene, pulmonary embolism — delayed). The wound remains the legally attributable cause of death through both primary and secondary pathways. Medico-legal certification integrates healing state for injury dating, healing prognosis for BNS Category 8 determination, and causal chain documentation for death certification.

REFLECT

A 45-year-old woman with poorly controlled diabetes sustains a laceration on her lower leg in a road traffic accident. Eight weeks later, the wound has not healed and has developed a secondary infection requiring amputation. The defence counsel argues that the amputation was caused by the diabetes and not by the original injury. As the forensic physician preparing the medico-legal opinion, how would you frame the causal relationship between the original wound, the diabetes as a modifying factor, and the eventual amputation? Consider the egg-shell skull principle in criminal law and how modifying factors are treated in medico-legal causation.