Trauma Reconstruction

Severe traumatic injuries — particularly those involving open fractures, degloving, or significant soft tissue loss — often require more than wound closure. When bone, hardware, tendon, or nerve is exposed, or when local tissue has been destroyed, microsurgical free flap reconstruction can mean the difference between saving and losing a limb. Dr. Lakhiani collaborates closely with orthopedic trauma surgeons to deliver coordinated, definitive reconstruction that maximizes functional recovery.^1,2

Understanding Open Fractures: The Gustilo Classification

Open fractures — fractures where the bone breaks through the skin — are classified by the Gustilo-Anderson system, which guides both orthopedic and reconstructive management:

• Type I: Clean wound <1 cm; simple fracture pattern. Usually closed primarily.
• Type II: Wound 1–10 cm; moderate soft tissue injury. Most can be closed primarily or with simple flaps.
• Type IIIA: Wound >10 cm or high-energy mechanism; adequate soft tissue remains for coverage despite extensive laceration. Usually coverable with local or pedicled flaps.
• Type IIIB: Extensive periosteal stripping and soft tissue loss; bone is exposed and local tissue is insufficient. Microsurgical free flap coverage is the standard of care.³
• Type IIIC: Vascular injury requiring repair in addition to soft tissue coverage. Combined vascular and reconstructive surgery is necessary — Dr. Lakhiani's microsurgical expertise is central to these cases.

Gustilo IIIB and IIIC tibial fractures represent the most common indication for free flap coverage in traumatic injury. Without reliable soft tissue coverage, hardware infection, osteomyelitis, and amputation remain significant risks.

Degloving Injuries

Degloving injuries occur when the skin and subcutaneous tissue are stripped away from the underlying fascia, muscle, or bone by shear force — typically from motor vehicle accidents, industrial machinery, or crush injuries. The degloved tissue is often non-viable due to disrupted vascularity, leaving large areas of exposed deep structures that cannot be closed with local tissue.

Management depends on the extent and pattern of injury:

• Closed degloving (Morel-Lavallée lesion): Internal shearing creates a cavity filled with blood and liquefied fat. Treatment involves drainage and compression; extensive cases may require debridement and closure.
• Open degloving of the extremity: Exposed bone, joint, or tendon requires free flap coverage when local options are absent. Skin grafting alone is insufficient when deep structures are exposed.
• Ring avulsion injuries: The finger is degloved by a ring catching on a fixed object. Replantation or reconstruction depends on vascular status and zone of injury.

Timing of Reconstruction: Acute vs. Staged

One of the most critical decisions in traumatic reconstruction is timing. The historical paradigm of waiting several days before coverage has been largely replaced by evidence favoring early definitive reconstruction when the patient is stable.^4,5

• Within 72 hours (acute): Early free flap coverage for Gustilo IIIB/IIIC fractures is associated with lower infection rates, shorter hospitalization, and better outcomes. When the patient is medically stable and the wound adequately debrided, early coverage is preferred.⁴
• Staged reconstruction (5–14 days): Complex polytrauma patients, hemodynamically unstable patients, or those with inadequately debrided wounds may benefit from temporary wound management (negative pressure wound therapy, antibiotic spacers) followed by definitive free flap reconstruction once the patient is optimized.
• Delayed reconstruction (>2 weeks): Patients who arrive from outside facilities, those with delayed referral, or those who developed complications after initial management may still benefit from free flap reconstruction — though success rates are influenced by wound bed quality and the presence of established infection.⁵

The reconstructive surgeon must be involved early in the trauma management to guide wound care, ensure appropriate orthopedic fixation is performed with reconstruction in mind, and plan the timing of definitive coverage.

Free Flap Coverage: Exposed Bone, Hardware, and Tendons

When orthopedic hardware (plates, screws, intramedullary nails, external fixators) is exposed through a wound, infection risk is extreme. Hardware infection can lead to osteomyelitis, implant failure, and non-union of the fracture. Free flap coverage resolves exposure by bringing healthy, well-vascularized tissue to cover and protect the hardware.

Similarly, exposed tendons dry out and necrose rapidly without coverage. Thin fasciocutaneous free flaps are ideal for tendon coverage because they provide protection without adding restrictive bulk that would limit tendon glide.

Common free flaps used in trauma reconstruction include:

• Anterolateral thigh (ALT) flap: The workhorse for large lower extremity defects — provides a large, reliable fasciocutaneous paddle with long pedicle. Can be thinned for conforming coverage.
• Latissimus dorsi free flap: Provides large surface area and muscle bulk; useful for filling dead space in infected wounds and coverage of large defects.
• Gracilis free flap: A smaller, reliable muscle flap well-suited for moderately sized defects of the lower leg and foot.⁶
• Radial forearm free flap: Thin and pliable; preferred for foot and hand defects where conforming coverage preserves gliding function.
• Rectus abdominis free flap: Provides substantial muscle bulk for obliterating dead space in infected or osteomyelitic wounds.

Replantation Concepts

Replantation — reattaching an amputated part — represents the most technically demanding application of microsurgery in trauma. When an amputated finger, hand, or other part is brought to surgery in acceptable condition, the microsurgical team works to re-establish blood flow by repairing arteries and veins under magnification, along with tendons, nerves, and bone fixation.

Not all amputations are candidates for replantation. Factors favoring replantation include:

• Clean guillotine-type amputations (versus avulsion or crush injuries)
• Single-level amputation rather than multilevel crush
• Patient age and functional demands
• Ischemia time (the shorter, the better — typically <6 hours for digits, <4 hours for proximal parts)

When replantation is not feasible or advisable, the residual limb or digit undergoes thoughtful reconstruction to optimize function, achieve durable coverage, and allow eventual prosthetic fitting if needed.

Upper Extremity Trauma

The hand and forearm present unique reconstructive challenges: thin skin, critical gliding structures (tendons, nerves), intricate joint anatomy, and the functional importance of even partial hand preservation. Traumatic injuries of the upper extremity may involve:

• Dorsal hand defects with exposed extensor tendons or metacarpals
• Volar defects with exposed flexor tendons or palmar neurovascular structures
• Forearm degloving with exposed radius, ulna, or both
• Amputation at various levels from finger to forearm

Thin, pliable fasciocutaneous free flaps (radial forearm contralateral, ALT thinned) are preferred for hand reconstruction to avoid restricting motion. Functional recovery depends on both reconstruction quality and aggressive occupational therapy.

Lower Extremity Trauma

The lower extremity — particularly the distal third of the tibia and the foot — is the most common site requiring free flap coverage after trauma.¹ This zone has minimal soft tissue padding, and local flap options are limited. The zone of injury from high-energy fractures often extends well beyond the wound margins, making the surrounding tissue unreliable for flap coverage.

After successful free flap coverage and fracture healing, patients undergo structured rehabilitation including physical therapy, gait training, and orthotic fitting. Return to weight-bearing is coordinated with the orthopedic trauma team based on fracture healing and flap durability.

Collaboration with Orthopedic Trauma Surgeons

Optimal outcomes in complex trauma reconstruction require a joint effort between orthopedic trauma surgeons and microsurgical plastic surgeons. At IFAR-affiliated institutions, Dr. Lakhiani works in concert with the orthopedic team to:

• Sequence debridement, fracture fixation, and soft tissue reconstruction in a coordinated operative plan
• Select fixation hardware configurations that allow flap inset and preserve perforator vessels
• Time reconstruction to optimize both wound conditions and the patient's overall status
• Manage post-operative care jointly, with shared decision-making around weight-bearing and rehabilitation progression