Lateral Extracavitary Approach to the Thoracolumbar Spine

What it exposes. LECA provides direct access to the anterior and middle columns of the thoracolumbar spine — the vertebral body, pedicle, disc and anterior epidural space — together with the posterior elements, all through a single posterior incision. It is the workhorse posterior approach for anterior column pathology at T10-L2, enabling 270-degree decompression, corpectomy with cage reconstruction, and posterior pedicle screw instrumentation without repositioning the patient or entering the chest cavity. Why it is chosen. The defining advantage is single-stage anterior column decompression and reconstruction plus posterior instrumentation through one prone incision, avoiding the morbidity of formal thoracotomy, video-assisted thoracoscopic surgery, or transperitoneal approaches. The patient stays in one position for the whole procedure, which shortens operative time and reduces anaesthetic risk, and the extrapleural plane keeps the pleural cavity intact in the majority of cases. Primary indications: - Thoracic and thoracolumbar burst fractures with significant retropulsion and neurologic deficit.

• Anterior epidural spinal tumours (metastatic or primary) requiring direct decompression.
• Vertebral osteomyelitis or discitis with abscess and neurologic compromise.
• Pathologic fractures with anterior column destruction and instability.
• Selected spinal stenosis with anterior pathology not reachable from a midline posterior approach. Contraindications: - Medical unfitness for prone positioning (severe cardiopulmonary disease, unstable cervical spine injury).
• Active skin infection over the planned incision.
• Previous surgery or radiation that has obliterated tissue planes.
• Pathology requiring greater than 270-degree access or extensive anterior vascular mobilisation — consider a transthoracic approach.
• Isolated posterior element pathology — use a standard midline posterior approach. Alternative approaches:

Work from prone positioning through to single-stage reconstruction, staying extrapleural at every step and protecting the exiting nerve root and dural sac as the lateral vertebral body is delivered.

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Structures at risk, by layer

Left versus right side. The left side is generally preferred because it avoids the azygos vein on the right, and many surgeons favour it for upper thoracic levels. The trade-off is that on the left the thoracic duct and aorta become the dangers — the duct ascends on the right, crosses to the left at about T5-T6, and is at risk during left-sided upper thoracic work. Be prepared to approach from either side depending on where the pathology sits. Extensile options. Extend proximally or distally by lengthening the incision and continuing the paraspinal flap elevation, resecting additional ribs — up to three or four levels can be accessed through a single incision for multilevel tumour or infection. LECA can be combined with a standard midline posterior approach through the same incision when extra posterior decompression or instrumentation is needed. If the pathology runs too far anterior or the extrapleural plane cannot be developed safely, convert to a formal transthoracic thoracotomy by entering the pleural cavity and using a rib spreader — rarely required. For L3-L5, the iliac crest and psoas limit the approach and a retroperitoneal or combined anterior-posterior route may be needed. Closure. Inspect the pleura and place a chest tube if breached. Allow the erector spinae flap to fall back, close the thoracolumbar fascia with heavy absorbable suture, and close the subcutaneous tissue and skin in layers over a deep drain. Complications

Post-operative care. Document a neurovascular check of the lower limbs and obtain a chest radiograph. Mobilise on day 1 with a TLSO or Jewett brace (worn for 8-12 weeks) and full weight bearing as tolerated unless the anterior column reconstruction requires protection. Give DVT prophylaxis and follow up at 2 weeks (wound check and radiographs), 6 weeks, 3 months (CT for fusion if indicated), 6 months and 1 year.

• 270-degree spinal canal decompression — the defining capability of LECA, decompressing the canal from a posterior incision.
• Corpectomy or vertebrectomy with expandable or static cage reconstruction (or a tricortical iliac-crest / fibular strut graft).
• Anterior column reconstruction for tumour, infection or fracture with anterior column destruction.
• Posterior instrumentation with pedicle screws and rods through the same incision.
• Biopsy, debridement and drainage of vertebral osteomyelitis or epidural abscess, and excision of anterior epidural tumours.
• Related: Spine tumour decompression and stabilization, Transthoracic thoracotomy approach, Anterior cervical corpectomy.

Guidelines, registries and global practice. LECA is used worldwide for anterior column pathology of the thoracolumbar spine, and principles converge across examination systems. CT and MRI are mandatory for surgical planning, and single-stage posterior approaches that avoid thoracotomy morbidity are increasingly favoured when they are anatomically feasible. In high-resource centres, expandable cages, navigation and intraoperative neuromonitoring are standard adjuncts; in resource-limited settings the same biomechanical principles are achieved with strut grafts (tricortical iliac crest or fibula) and standard pedicle screw systems, the extrapleural technique remaining identical.

Consent (globally applicable). Discuss approach-specific risks including pleural breach requiring a chest tube (10-15 percent), nerve root injury (3-6 percent), dural tear (2-5 percent), thoracic duct injury (less than 1 percent on the left), wound infection (2-5 percent), and the possibility of conversion to a transthoracic approach if the extrapleural plane cannot be developed.