Understanding Knee Scars: Types, Treatment & Prevention
Understanding Knee Scars: Types, Treatment & Prevention
Knee scars result from surgery (arthroscopy, TKA, ACLR) or trauma. Their appearance and impact vary widely—but early, consistent care yields the best aesthetic and functional outcome.
Scar Types
- Linear: Straight, flat, pale — typical surgical incision.
- Hypertrophic: Raised, red, within wound borders. Peaks 3–6 mo, may regress.
- Keloid: Extends beyond original wound, progressive, recurrent. Genetic predisposition (darker skin).
- Contracture: Tightens across joint → limits ROM. Common post-burn or large excision.
- Atrophic: Depressed, tethered — acne, chickenpox, steroid injection.
Treatment Options (Evidence-Based)
| Modality | Best For | Evidence |
|---|---|---|
| Silicone gel/sheeting | Hypertrophic, keloid prevention & treatment | Grade A (first-line) |
| Pressure therapy | Burn grafts, large scars | Grade B |
| Intralesional corticosteroids | Hypertrophic, keloid | Grade A (triamcinolone 10–40 mg/mL) |
| Laser (PDL, fractional CO₂, Nd:YAG) | Erythema, texture, pliability | Grade B–C |
| 5-FU / bleomycin injections | Refractory keloids | Grade B |
| Surgical revision (+ adjuvant) | Contracture, wide, symptomatic | Recurrence high for keloids without RT |
| Radiation (post-excision) | Keloids | Grade B (controversial long-term) |
Prevention Starts Intra-Op
- Meticulous hemostasis, atraumatic handling, eversion of edges
- Subcuticular absorbable + skin adhesive/steri-strips (reduce tension)
- Incision placement: Langer's lines, joint flexion creases
Post-Op Scar Care Protocol
- Days 1–14: Keep clean, covered, moist (petrolatum). No tension.
- Weeks 2–12: Silicone 12–24 hr/day + scar massage (firm, circular, 5 min 2–3×/day).
- Sun protection (SPF 50+) × 12–18 mo — UV darkens scars permanently.
- Monitor for hypertrophy → early intervention.
When to See a Specialist
- Painful, pruritic, expanding, limiting ROM, draining, or cosmetically distressing after 3 months.
Scars mature over 12–18 months. Early, consistent care yields the best aesthetic and functional outcome.
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