A 42-year-old man undergoes elective abdominal surgery. His wound heals uneventfully over 3 weeks. Which feature best distinguishes primary intention healing from secondary intention healing in this patient?
A. Presence of granulation tissue formation and significant wound contraction
B. Prominent collagen deposition beginning at 3 weeks post-injury
C. Minimal scar formation and direct approximation of wound edges with epithelialization across a narrow gap
D. Delayed epithelialization requiring 4–6 weeks or longer
Explanation
Primary vs. Secondary Intention Healing
Table
Feature
Primary Intention
Secondary Intention
Wound edges
Closely approximated (sutured)
Wide gap; edges not opposed
Epithelialization
Rapid; across narrow gap (days)
Slow; from wound margins (weeks–months)
Granulation tissue
Minimal or absent
Abundant and prominent
Wound contraction
Minimal (<10%)
Marked (up to 80%)
Scar formation
Fine, linear scar
Thick, irregular scar
Timeline
3–4 weeks for strength gain
4–6+ weeks for epithelialization
Examples
Surgical wounds, clean lacerations
Pressure ulcers, burns, infected wounds
Primary Intention (First Intention) Healing
1.
Minimal inflammatory phase — edges are clean and approximated
2.
Rapid epithelialization — epithelial cells migrate across a narrow gap (< 1 mm)
3.
Minimal granulation tissue — collagen deposition occurs in the dermis without prominent granulation tissue
4.
Fine scar — organized collagen alignment results in a linear scar
5.
Rapid strength gain — reaches ~70% strength by 3 months
Secondary Intention (Healing by Granulation) Healing
1.
Prolonged inflammatory phase — large tissue defect requires extensive cleanup
2.
Abundant granulation tissue — prominent vascular and fibroblastic response
3.
Wound contraction — myofibroblasts contract the wound, reducing defect size by 60–80%
4.
Epithelialization from margins — epithelial cells migrate from wound edges inward
5.
Thick, irregular scar — disorganized collagen and myofibroblast remnants
Key Point
The single best discriminator is the presence or absence of granulation tissue and the mechanism of epithelialization. Primary intention shows minimal granulation tissue and epithelialization across a narrow gap; secondary intention shows abundant granulation tissue and epithelialization from wound margins.
High-YieldNEET PG
In primary intention, the wound is closed (sutured), so epithelial cells bridge a narrow gap directly. In secondary intention, the wound is open, so epithelial cells must migrate centripetally from the wound edges—a much slower process requiring prominent granulation tissue.
Clinically, a surgical wound that is closed with sutures and heals without infection will follow primary intention. A pressure ulcer or burn wound that is left open will heal by secondary intention, taking weeks to months and leaving a prominent scar with potential contracture complications.
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