Residency · Residency · Plastic Surgery

Principles of Head and Neck Oncologic Reconstruction

Introduction

Head and neck oncologic reconstruction restores form and function after ablative surgery for cancers of the oral cavity, oropharynx, larynx, hypopharynx, paranasal sinuses, and skin. Goals include restoration of speech, swallowing, airway patency, facial aesthetics, and psychosocial well-being. The reconstructive ladder has been supplanted by the reconstructive elevator concept: selecting the optimal technique based on defect requirements rather than defaulting to the simplest option. Multidisciplinary collaboration between head and neck surgical oncologists, plastic surgeons, prosthodontists, speech pathologists, and radiation oncologists is essential.

Free tissue transfer has become the gold standard for complex defects, with success rates exceeding 95% in high-volume centers.

Oncologic Considerations

Tumor Biology and Staging

Squamous cell carcinoma (SCC) accounts for >90% of mucosal head and neck cancers. TNM staging guides both ablative and reconstructive planning. Tumor factors affecting reconstruction: size, location, depth of invasion, bone involvement, and proximity to critical structures. Margins: 1-2 cm mucosal margins typically required; frozen section confirmation intraoperatively.

Neck dissection (selective, modified radical, or radical) is performed concurrently and affects recipient vessel availability.

Effects of Radiation and Chemoradiation

Adjuvant radiation (60-70 Gy) causes tissue fibrosis, microvascular damage, and impaired wound healing. Previously irradiated tissues have 3-5x higher wound complication rates. Osteoradionecrosis of the mandible is a devastating late complication; risk increases with doses >60 Gy. Free flap reconstruction is preferred in the irradiated field due to introduction of non-irradiated tissue with independent blood supply.

Timing: immediate reconstruction at time of ablation is preferred; delayed reconstruction reserved for advanced disease with uncertain margins.

Defect Analysis and Reconstructive Planning

Reconstructive Framework

Analyze defects by location, size, tissue components (skin, mucosa, muscle, bone), and functional requirements. Oral cavity defects: require restoration of tongue mobility, oral competence, and dental rehabilitation. Mandibular defects: classified by Urken or Jewer classification; lateral defects may tolerate plate reconstruction, anterior (symphyseal) defects require vascularized bone. Midface/maxillary defects: classified by Brown classification; range from obturator prosthesis to complex free flap reconstruction.

Pharyngoesophageal defects: require circumferential mucosal lining; options include jejunal free flap, tubed fasciocutaneous flaps, or gastric pull-up. Scalp and cranial defects: require durable, well-vascularized coverage; see dedicated lecture.

Recipient Vessels

Facial artery and vein: reliable, easily accessible; preferred for oral cavity and lower face reconstruction. Superior thyroid artery: useful when facial vessels are unavailable. Transverse cervical vessels: reliable when neck dissection preserves them. Internal jugular vein: commonly used for venous drainage; end-to-side anastomosis preferred.

Prior neck dissection or radiation may deplete recipient vessels; preoperative CT angiography can aid planning. Vein grafts may be necessary in revision or post-radiation cases.

<image>Anatomical illustration of the head and neck showing common recipient vessels for microvascular free flap anastomosis, including the facial artery, superior thyroid artery, lingual artery, and transverse cervical vessels, with their relationship to the neck dissection levels</image>

Reconstructive Options by Defect

Local and Regional Flaps

Submental island flap: based on submental artery; excellent for floor of mouth and lower lip defects; oncologic safety debated due to proximity to level I nodes. Pectoralis major myocutaneous flap: workhorse pedicled flap; based on thoracoacromial artery; reliable for pharyngeal, oral cavity, and neck defects. Supraclavicular artery island flap: thin, pliable flap for neck, lower face, and oral cavity; based on transverse cervical artery. Deltopectoral flap: fasciocutaneous flap based on internal mammary perforators; useful for cervical esophageal and pharyngeal defects.

Temporalis muscle flap: for maxillary and orbital defects; based on deep temporal artery. Latissimus dorsi flap: large muscle or myocutaneous flap for extensive defects; pedicled or free.

Free Flaps for Head and Neck Reconstruction

Radial forearm free flap (RFFF): thin, pliable fasciocutaneous flap; ideal for oral tongue, floor of mouth, and pharyngeal reconstruction; reliable anatomy (radial artery, cephalic vein). Anterolateral thigh (ALT) flap: versatile; fasciocutaneous, myocutaneous, or adipofascial; based on descending branch of lateral circumflex femoral artery; ideal for large soft tissue defects. Fibula free flap: gold standard for mandible reconstruction; provides up to 25 cm of bone; see dedicated lecture. Scapular/parascapular flap: based on circumflex scapular artery; provides bone (scapular tip), muscle, and skin on independent pedicles; ideal for composite oromandibular defects.

Jejunal free flap: mucosal-lined conduit for circumferential pharyngoesophageal reconstruction; based on jejunal mesenteric arcade. Iliac crest (DCIA) flap: provides substantial bone stock for maxillary and mandibular reconstruction; bulky; dental implant compatible.

<image>Surgical planning diagram showing a composite oromandibular defect with lateral mandible and floor of mouth involvement, alongside the planned fibula free flap reconstruction with osteotomies for mandibular contouring and skin paddle for mucosal lining</image>

Functional Rehabilitation

Speech and Swallowing

Tongue reconstruction must preserve or restore mobility; thin pliable flaps (RFFF) allow better tongue-palate contact for speech articulation. Palatal defects: obturator prosthesis or free flap (RFFF, ALT) to separate oral and nasal cavities; prevents velopharyngeal insufficiency. Postoperative speech therapy is essential; outcomes depend on preserved sensory and motor innervation. Swallowing rehabilitation: assessment with videofluoroscopy (modified barium swallow) postoperatively.

Dental Rehabilitation

Vascularized bone (fibula, iliac crest, scapula) allows placement of osseointegrated dental implants. Virtual surgical planning (VSP) with cutting guides improves accuracy of bone positioning for implant placement. Implants can be placed primarily or at a delayed stage (typically 6-12 months post-reconstruction). Implant-supported prostheses significantly improve mastication, speech, and quality of life.

Complications

Free flap failure: overall rate 2-5%; most common cause is venous thrombosis; requires early recognition and emergent re-exploration. Fistula formation: orocutaneous or pharyngocutaneous; rates of 10-30% in salvage cases; managed conservatively or with revision surgery. Wound dehiscence: increased in irradiated fields; meticulous tension-free closure essential. Donor site morbidity: radial forearm (wrist weakness, poor aesthetics), fibula (ankle instability, peroneal nerve injury), ALT (lateral thigh numbness, contour deformity).

Osteoradionecrosis: in mandibular reconstruction with adjuvant radiation; prophylactic measures include hyperbaric oxygen (controversial). Plate exposure: hardware exposure through thin soft tissue; may require plate removal and revision.

<image>Flowchart showing the reconstructive algorithm for head and neck defects organized by anatomic subsite (oral cavity, mandible, maxilla, pharynx) with recommended first-line and second-line reconstructive options for each</image>

Key Clinical Pearls

Immediate reconstruction at the time of ablation is preferred whenever oncologically safe; it reduces operative stages and improves functional outcomes. Free tissue transfer is the gold standard for complex head and neck defects; the radial forearm and ALT flaps are the workhorse soft tissue options. Virtual surgical planning has revolutionized bony reconstruction accuracy, particularly for mandible and maxilla. Always assess recipient vessel availability preoperatively, especially in patients with prior surgery or radiation. Multidisciplinary team involvement (speech pathology, prosthodontics, radiation oncology) from the initial planning stage optimizes outcomes.

References

1. Urken ML, Cheney ML, Blackwell KE, Harris JR, Hadlock TA, Futran N. Atlas of Regional and Free Flaps for Head and Neck Reconstruction. 2nd ed. Lippincott Williams & Wilkins; 2012.
2. Hanasono MM, Friel MT, Klem C, et al. Impact of reconstructive microsurgery in patients with advanced oral cavity cancers. Head Neck. 2009;31(10):1346-1356.
3. Sweeny L, Rosenthal EL, Light T, et al. Outcomes and cost implications of microvascular reconstructions of the head and neck. Head Neck. 2019;41(4):930-939.
4. Brown JS, Shaw RJ. Reconstruction of the maxilla and midface: introducing a new classification. Lancet Oncol. 2010;11(10):1001-1008.

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