In an adult patient with intact skin, no peripheral vascular disease, and no infection at the donor site, what are the guidelines for harvesting fascia lata—including optimal location, maximum graft dimensions, and precautions to prevent complications such as lateral femoral cutaneous nerve injury, hematoma, seroma, wound dehiscence, and sensory loss?

Fascia Lata Harvest Guidelines

Harvest fascia lata from the lateral thigh through a small 2–3 cm incision positioned approximately 10–15 cm proximal to the lateral femoral condyle, obtaining grafts up to 3 × 6 cm for small defects or 10 × 15 cm for large reconstructions, with mandatory drain placement and compression wrapping for 4–6 weeks to prevent seroma formation.

Optimal Harvest Location

• Make the incision on the lateral aspect of the thigh, using either a straight or "S"-shaped approach to access the fascia lata while respecting anatomical landmarks 1.
• The lateral thigh location minimizes risk to the lateral femoral cutaneous nerve, which runs more anteriorly 2, 3.
• For minimally invasive approaches, a 2 cm lateral thigh incision is sufficient when using endoscopic techniques 4.

Maximum Graft Dimensions

• For small defects (≤3 × 6 cm): Direct fascial margin closure with sutures is feasible without reconstruction 5.
• For large defects (>3 × 6 cm): Grafts up to 10 × 15 cm can be safely harvested, though fascial defects of this size require allograft reconstruction to prevent muscle bulge or compartment syndrome 5.
• In a series of 111 large fascia lata harvests, adequate graft length was obtained in 100% of cases without intraoperative complications 2.

Critical Precautions to Prevent Complications

Seroma Prevention (Most Common Complication)

• Place a temporary Jackson-Pratt drain intraoperatively at the harvest site 2.
• Apply mild compression wrapping to the thigh for 4–6 weeks postoperatively 2.
• Despite these measures, 14.4% of patients developed harvest-site seromas in one large series, though 87.5% resolved with expectant management 2.

Muscle Herniation Prevention

• For fascial defects >3 × 6 cm, reconstruct the fascia lata defect with allograft rather than leaving it open 5.
• When using endoscopic techniques, perform fascial reapproximation using an "outside-in" suturing technique with endoscopic visualization to retrieve sutures beneath the skin 4.
• Direct fascial closure prevents the muscle bulge that occurred in 14.8% of patients when defects were left open 2.

Nerve Injury Prevention

• Avoid extending the incision too far anteriorly to protect the lateral femoral cutaneous nerve 3.
• Use blunt dissection techniques when developing tissue planes 4.

Hematoma Prevention

• Meticulous hemostasis during harvest is essential 1.
• Drain placement serves dual purpose for both seroma and hematoma prevention 2.

Expected Postoperative Course

• Paresthesia near the incision occurs in 54.6% of patients but is typically mild and non-bothersome 2.
• Mean Visual Analog Pain scores are low (mean = 1 on 0–10 scale) 2.
• Functional scores of the harvested thigh reach 91% of the contralateral thigh at 6 months and 94% at 18 months 3.
• No patients require postoperative lower limb physical therapy in most series 3.
• Asymptomatic thigh bulges develop in 14.8% when fascial defects are not reconstructed 2.

Technique Refinements

• Endoscopic harvest through a 2 cm incision provides excellent cosmetic results and can be performed with fascial reapproximation to minimize herniation 4.
• The "S"-shaped incision for open approaches enhances ease and control of harvesting while respecting anatomical landmarks 1.
• Patient satisfaction increases over time, with most patients reporting satisfaction or very high satisfaction at all follow-up intervals 3.

Key Pitfall to Avoid

The single most critical error is failing to reconstruct fascial defects >3 × 6 cm, which leads to muscle bulge and potential compartment syndrome 5. When large grafts are needed, plan for allograft fascial reconstruction at the time of harvest rather than primary closure under tension.