|  | Conditions & Treatments | Ulcers

Ulcer Healing: Understanding the Stages and Process

Wound healing is a dynamic, overlapping continuum. For chronic ulcers, progression through phases is often stalled.

Phases of Healing

  1. Hemostasis (Immediate): Vasoconstriction, platelet aggregation, fibrin clot → provisional matrix. Growth factors released (PDGF, TGF-β, EGF, FGF).
  2. Inflammation (Days 1–4): Neutrophils (clean debris, bacteria) → Macrophages (phagocytosis, cytokine orchestration: TNF-α, IL-1, VEGF, TGF-β). Prolonged inflammation = chronic wound.
  3. Proliferation (Days 4–21+):
    • Angiogenesis: VEGF/FGF → new capillaries.
    • Granulation Tissue: Fibroblasts + new matrix (collagen III, fibronectin, hyaluronan) + vessels. Pink, shiny, bumpy.
    • Re-epithelialization: Keratinocyte migration from edges/adnexa → confluence. Requires moist environment.
    • Contraction: Myofibroblasts (α-SMA) pull wound edges inward.
  4. Maturation / Remodeling (Weeks–Years):
    • Collagen III → Collagen I (stronger).
    • Cross-linking (lysyl oxidase).
    • Apoptosis of excess cells/vessels.
    • Scar formation (never 100% tensile strength).

Why Chronic Ulcers Stall

  • Persistent inflammation (biofilm, ischemia, pressure, hyperglycemia).
  • Senescent fibroblasts, MMP/TIMP imbalance (excess matrix degradation).
  • Deficient growth factors, stem cells.
  • Inadequate perfusion/oxygenation.

Interventions to Restart Healing

  • Debridement: Sharp, enzymatic, autolytic, biological — removes senescent cells, biofilm.
  • Infection Control: Topical antimicrobials (silver, honey, PHMB), systemic if spreading.
  • Moisture Balance: Dressings matched to exudate.
  • Offloading / Compression: Essential for diabetic/venous ulcers.
  • Advanced Therapies: NPWT, cellular/tissue products (amniotic, placental), growth factors (becaplermin), biophysical (ultrasound, electrical stimulation, shockwave).
  • Nutrition: Protein 1.5–2 g/kg, Vit C, Zn, Arginine, Glutamine.

Ulcers - Related Articles