Residency · Residency · Plastic Surgery

Burn Reconstruction and Scar Contracture Release

Introduction

Burn scar contracture is the most common complication requiring surgical intervention after burn injury. Contractures develop when wound healing produces excessive fibrosis across joints or concavities. Reconstruction goals: restore function, improve aesthetics, and prevent recurrence. Timing of reconstruction follows the reconstructive ladder: conservative measures first, then surgical release when maturation is complete (typically 6-18 months post-injury).

Pathophysiology of Burn Scar Contracture

Wound Healing and Scar Formation

Myofibroblasts drive wound contraction during the proliferative phase (alpha-smooth muscle actin expression). Excessive collagen deposition with disorganized collagen III-to-collagen I ratio leads to hypertrophic scarring. Hypertrophic scars remain within wound boundaries; keloids extend beyond (rare in burn scars). Deep partial-thickness and full-thickness burns that heal by secondary intention have the highest contracture risk. Burns crossing joints, concavities (neck, axilla, antecubital fossa), and web spaces are most susceptible.

Classification of Contracture Severity

Linear (band): single band of scar crossing a joint; most amenable to Z-plasty. Widespread (broad): broad sheet of scar; requires excision and resurfacing. Contracture with tissue loss: significant soft tissue deficiency requiring flap reconstruction. McCauley classification grades contracture based on functional limitation (mild, moderate, severe).

Evaluation and Preoperative Planning

Document active and passive range of motion at all affected joints. Assess scar maturity: immature scars are red, raised, firm; mature scars are pale, soft, flat. Determine depth of contracture: skin-only versus involvement of deeper structures (fascia, tendon, joint capsule). Assess available adjacent tissue quality and donor site availability.

Serial photography and goniometry for objective tracking. Timing: operate when scar is mature unless functional impairment is severe (e.g., inability to open mouth, eyelid ectropion, hand contracture limiting function).

Non-Operative Management

Pressure garments: 20-30 mmHg worn 23 hours/day for 12-18 months; most effective when started early. Silicone sheeting/gel: reduces hypertrophic scar formation; applied continuously for 12-24 hours/day. Physical therapy and splinting: maintain range of motion; dynamic and static progressive splints. Corticosteroid injection: triamcinolone acetonide (10-40 mg/mL) intralesional for hypertrophic scars; risk of atrophy and hypopigmentation.

Laser therapy: pulsed dye laser (595 nm) for erythema; fractional CO2 laser for scar texture and pliability; emerging evidence for improved range of motion.

Surgical Techniques

Z-Plasty

Most versatile technique for linear band contractures. Transposes two triangular flaps to lengthen the scar in the direction of the central limb. Standard 60-degree angle Z-plasty achieves 75% theoretical gain in length. Multiple Z-plasties (serial or compound) distribute tension and improve cosmesis. Five-flap Z-plasty (Jumping Man): useful for web space contractures (first web space of hand, digital web spaces).

Local Flaps

V-Y advancement: useful for moderate contractures; advances tissue into the defect. Transposition flaps: move adjacent unburned tissue into the released area. Propeller flaps: perforator-based rotation into defect after release; useful in extremity contractures. Local flaps require adequate adjacent unburned tissue.

Skin Grafting After Release

Full-thickness skin grafts (FTSG): preferred for functional areas (hand, face, neck); less contracture recurrence than STSG. Split-thickness skin grafts (STSG): used when FTSG donor sites insufficient; higher recurrence rate. Sheet grafts always preferred over meshed for contracture release. Splint the joint in maximal extension/correction for 2-3 weeks post-grafting.

Tissue Expansion

Place expanders in adjacent unburned tissue; serial expansion over 6-12 weeks. Expanded tissue provides color and texture match; hair-bearing scalp can be expanded for alopecia reconstruction. Advantages: like-for-like tissue replacement, no distant donor site. Disadvantages: multiple procedures, risk of implant exposure/infection, prolonged treatment course.

Free Tissue Transfer

Reserved for severe contractures with inadequate local tissue. ALT flap: workhorse for large neck, axillary, and extremity contractures. Radial forearm flap: thin, pliable; excellent for neck and hand contractures. Parascapular flap: good for axillary contractures; donor site concealed. Prelaminated or prefabricated flaps for complex reconstructions.

<image>Stepwise illustration of burn scar contracture release using Z-plasty technique. Panel A shows a linear burn scar band crossing the antecubital fossa with the elbow held in flexion contracture. Panel B shows the Z-plasty design drawn on the skin with a central limb along the contracture and two lateral limbs at 60-degree angles, each equal in length to the central limb. Panel C shows the two triangular flaps elevated and transposed after the scar band has been incised and the underlying contracture released, with the elbow now fully extended. Panel D shows the final closure with the flaps interdigitated and sutured, demonstrating the lengthened scar line now oriented perpendicular to the original contracture. Measurements showing 75% gain in length are indicated.</image>

Specific Anatomic Regions

Neck Contracture

Most common significant contracture in burn patients. Limits extension, rotation, and lateral flexion; can restrict airway and feeding. Release must address the mentosternal angle (normal: 90-110 degrees). Thick FTSG or flap coverage preferred to prevent recurrence. Post-release: neck conformer or cervical collar in extension for 6-12 months.

Axillary Contracture

Limits abduction and forward flexion. Anterior, posterior, or circumferential bands. Release with local flaps (five-flap Z-plasty, propeller flaps) or FTSG. Aggressive postoperative splinting in 90-degree abduction.

Hand Contracture

First web space contracture: limits thumb opposition; five-flap Z-plasty or dorsal rotation flap. Digital syndactyly from interdigital scarring: release with FTSG to commissures. Palmar contractures: release and FTSG; aggressive hand therapy postoperatively. Boutonniere and swan neck deformities from extensor mechanism involvement.

<image>Clinical illustration of burn scar contracture of the neck showing a broad sheet of hypertrophic scar tissue extending from the chin to the upper chest, with the head forced into flexion and the mentosternal angle reduced to approximately 45 degrees. The scar is depicted as thickened, erythematous, and irregular with visible web bands along the anterior neck. Anatomic landmarks labeled include the mandible, hyoid bone position, sternocleidomastoid muscles, and sternal notch. An inset diagram shows the normal mentosternal angle of 90-110 degrees compared to the contracted angle.</image>

Postoperative Management

Splinting in position of maximal correction for 2-4 weeks continuously, then nighttime for 6-12 months. Early and aggressive physical and occupational therapy beginning at 1-2 weeks. Pressure garments over healed grafts and flaps for 12-18 months. Silicone sheeting on all scars.

Serial range of motion measurements to track progress and detect early recurrence. Consider adjunctive laser therapy (fractional CO2) at 3-6 months to improve scar pliability.

Complications and Recurrence

Recurrence is the most common complication; occurs in 30-60% of cases depending on technique. FTSG has lower recurrence than STSG; flaps have lowest recurrence. Inadequate postoperative splinting is the most common modifiable risk factor for recurrence. Graft loss from hematoma, seroma, infection, or shear.

Nerve or vascular injury during release of deep contractures. Joint subluxation or dislocation after longstanding contractures (especially in children).

<image>Algorithm flowchart for burn scar contracture management. The flowchart begins with assessment of scar maturity and functional deficit at the top. The first branch separates immature scars directed to conservative management (pressure garments, silicone, physical therapy, laser) from mature scars with functional limitation directed to surgical planning. The surgical branch then divides based on contracture type: linear band contractures directed to Z-plasty or local flaps, broad sheet contractures directed to release with FTSG or STSG, and severe contractures with tissue deficiency directed to tissue expansion or free flap. Each surgical pathway shows a final box for postoperative care including splinting, pressure garments, and therapy.</image>

Key Clinical Pearls

Always release contractures fully at the time of surgery; incomplete release leads to certain recurrence regardless of coverage method. Full-thickness skin grafts and flaps have significantly lower recurrence rates than split-thickness grafts for contracture reconstruction; use FTSG whenever donor sites permit. Postoperative splinting is as important as the operation itself; failure to comply with prolonged splinting protocols is the most common cause of recurrence. In children, anticipate growth-related contracture recurrence; plan for serial reconstructions and involve the family in long-term therapy compliance. Fractional CO2 laser therapy is increasingly used as an adjunct both before and after surgical release to improve scar pliability and functional outcomes.

References

• Schneider JC, Holavanahalli R, Helm P, Goldstein R, Kowalske K. Contractures in burn injury: defining the problem. J Burn Care Res. 2006;27(4):508-514.
• Goel A, Shrivastava P. Post-burn scars and scar contractures. Indian J Plast Surg. 2010;43(Suppl):S63-S71.
• Sood RF, Hocking AM, Muffley LA, et al. Race and melanocortin 1 receptor polymorphism R163Q are associated with post-burn hypertrophic scarring. J Invest Dermatol. 2015;135(10):2394-2401.
• Lexer E. Die gesamte Wiederherstellungschirurgie. Leipzig: Barth; 1931. (Historical reference for early contracture release principles.)

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