When is a full-thickness skin graft indicated and how is it harvested, placed, and managed postoperatively?

Full-Thickness Skin Graft: Indications, Technique, and Management

Full-thickness skin grafts (FTSGs) are indicated for defects requiring superior aesthetic outcomes, minimal contracture, and good color/texture matching, particularly over joints, functional areas, and cosmetically sensitive regions like the face and hands.

Indications for FTSG

FTSGs are preferred over split-thickness grafts when:

• Functional preservation is critical - Areas over joints or regions of motion where contracture would impair function 1
• Aesthetic demands are high - Facial reconstruction (especially nasal defects), visible extremities, and areas requiring color/texture matching 2, 3
• Pediatric reconstruction - Growing extremities where long-term contracture prevention is essential 1
• Adequate wound bed exists - Healthy, well-vascularized recipient sites with good blood supply 1, 4

The evidence shows FTSGs result in less secondary contracture than split-thickness grafts, making them crucial for growing extremities and areas of motion 1. While guidelines for epidermolysis bullosa and other conditions mention both graft types, there is insufficient evidence that any one modality produces superior healing, though FTSGs consistently demonstrate better aesthetic outcomes 5, 3.

Harvest Sites and Technique

Donor Site Selection

Common harvest sites include:

• Suprapubic/lower abdomen - Allows abundant tissue harvest with concealed location using Pfannenstiel incision; permits repeat harvesting 1, 6
• Forehead (widow's peak) - Excellent for nasal reconstruction with superior thickness and contour matching 2
• Anterolateral thigh - Provides large grafts (7-30 cm length, 3-12 cm width) with primary closure and minimal donor morbidity 7
• Postauricular or upper arm - Traditional sites for facial/cervical reconstruction 3

Harvesting Technique

1. Design elliptical incision at donor site to facilitate primary closure
2. Harvest full-thickness skin including epidermis and entire dermis down to subcutaneous fat
3. Defat the graft meticulously - Remove all subcutaneous tissue while preserving dermal plexus
4. Close donor site primarily when possible; use advancement techniques for larger defects 7, 8

The "slide-by-side" technique can improve tissue economy and decrease closure tension for large grafts 8.

Graft Placement

Critical steps for successful placement:

1. Prepare recipient bed - Must have healthy granulation tissue or well-vascularized wound bed 1, 4
2. Secure graft with sutures around periphery
3. Apply bolster/tie-over dressing for 5-7 days to prevent shear forces and fluid accumulation 1, 3
4. Consider vacuum-assisted closure (VAC) - Particularly effective for large grafts, improving take rates 7

Graft Healing Phases

FTSGs heal through three distinct phases 1:

• Plasmatic imbibition (0-48 hours) - Graft survives on serum absorption
• Inosculation (48-72 hours) - Anastomosis of graft and recipient vessels
• Revascularization (4-7 days) - New vessel ingrowth

Postoperative Management

Immediate Care (First Week)

The recipient site dressing is paramount - Most graft failures result from shear forces, fluid collections (hematoma/seroma), or infection 1.

• Immobilize graft completely with bolster dressing for 5-7 days
• Avoid any movement that could disrupt graft adherence
• Monitor for fluid accumulation - Evacuate any collections immediately
• First dressing change at 5-7 days to assess graft take

Expected Outcomes

• Average graft success rate: 89.6% with mean follow-up of 13 months 9
• Partial graft failure (<20%) may occur but often doesn't require additional surgery 7
• Complete healing typically achieved in all patients with appropriate technique 4
• Mean healing time: 87 days for traumatic extremity wounds 4

Delayed Grafting Considerations

For skin cancer reconstruction, delayed FTSG (average 16.5 days post-excision) demonstrates 89.6% success 9. Optimal delay is 2-3 weeks; grafts placed within 1 week show significantly lower success rates 9. This allows wound bed optimization and margin confirmation.

Common Pitfalls and How to Avoid Them

Primary causes of graft failure:

1. Shear forces - Use adequate immobilization and bolster dressing
2. Fluid collections - Ensure meticulous hemostasis; consider VAC
3. Infection - Maintain sterile technique; healthy wound bed essential
4. Inadequate defatting - Prevents revascularization; must remove all subcutaneous tissue
5. Poor recipient bed - Avoid grafting onto exposed bone, tendon without paratenon, or poorly vascularized tissue

Donor site complications:

• Delayed healing at donor sites can occur, particularly in compromised patients 5
• Primary closure is preferred when feasible to minimize morbidity
• Anterolateral thigh provides early pain relief with minimal donor morbidity 7

Special Populations

Traumatic injuries: Avulsed soft tissue can be immediately defatted and used as FTSG, achieving 100% complete healing with mean 88% initial take, avoiding flap procedures and additional donor morbidity 4.

Pediatric patients: FTSGs are particularly valuable for growing extremities where contracture prevention is critical 1.