Endoscopic Discectomy

Overview

• Campbell's Operative Orthopaedics 15th Ed 2026

Approaches

1. Transforaminal Endoscopic Lumbar Discectomy (TELD)

• Central, posterolateral, foraminal, or extraforaminal herniations at L1-L4, and sometimes at L5-S1 if anatomy permits
• Preferred when facet joint preservation is important (zygapophyseal joint not violated)

• Patient prone or lateral decubitus (lateral allows intraoperative straight-leg-raise testing)
• Performed under monitored anesthesia care (MAC) with intermittent propofol - patient remains awake enough to communicate
• An 18-20 gauge needle is advanced obliquely into Kambin's triangle at the foramen
• A diagnostic transforaminal epidural injection is placed first - profound relief predicts good surgical outcome
• Guidewire placed, then sequential dilators advanced under fluoroscopy
• A 1-cm skin incision is made
• Foramen is opened either by percutaneous reamers (fluoroscopic guidance) or a diamond burr under direct endoscopic vision
• Disc material is removed once the Wagner arch (inferior pedicle + superior articular process) and herniation are identified
• Decompression endpoint: nerve root pulsates to heartbeat without deformity; patient reports resolution of radicular pain
• Wound closed with single subcuticular stitch + skin glue

• Shower same day; discharge once ambulatory and able to void
• Driving restricted until postoperative day 2 or off narcotics (often only NSAIDs needed)
• Trunk stabilization therapy starts at 2 weeks

2. Interlaminar Endoscopic Lumbar Discectomy (IELD)

• Primarily for posterolateral herniations at L5-S1
• Can be used at higher levels if the interlaminar window is wide enough
• Facet-sparing technique (used when lateral recess decompression is NOT needed)

• Patient prone; can be done under general anesthesia or MAC
• Laminae, medial pedicular line, and midline are marked fluoroscopically
• 18-gauge needle placed at the trailing edge of the L5 lamina
• 8 mL of 1% lidocaine with epinephrine infiltrated to ease soft tissue dissection
• 1-cm incision made; guidewire, then dilators placed
• Approach angle: more medial-to-lateral for lateral herniations, more lateral-to-medial for central herniations
• Postoperative care is identical to the transforaminal approach

Combined Approach

• Maintaining direct light-based visualization of anatomy and pathology
• Minimizing iatrogenic instability (zygapophyseal joint preserved)
• Avoiding the need for general anesthesia

Advantages Over Open/Microdiscectomy

Complications

• Dural tear (CSF leak): One advantage of endoscopic/tubular discectomy is the small dead space - minor dural tears can often be treated with fibrin glue alone without root herniation
  • Management: fibrin glue, 3-day course of acetazolamide (Diamox) to reduce CSF production; bed rest only if positional headaches present; blood patch for persistent spinal headache
  • Pseudomeningocele can rarely cause persistent pain from nerve root compression
• Epidural bleeding: Controlled by adjusting fluid pressure and flow through the endoscope pump (not to exceed diastolic blood pressure)
• Recurrence: Percutaneous endoscopic lumbar discectomy has been used successfully for recurrent disc herniations
• Operative failure: Conversion to open surgery may be required if anatomy is unfavorable or adequate decompression cannot be achieved endoscopically

Additional Considerations

• Large herniations / lateral recess or foraminal stenosis: May require additional open exposure - hemilaminectomy, total laminectomy, or facetectomy. If >50% of combined bilateral facets removed, consider fusion.
• Far lateral disc herniation: A long tubular retractor at the correct trajectory is useful; approached via removal of the intertransverse ligament lateral to the spinal canal.
• Intradural disc herniation (rare): May require transdural approach; higher risk of CSF leak and intradural scarring.
• Fat grafting: Reserved for dural repairs and small laminar defects - does not improve clinical outcomes but reduces dural scarring.

Recent Evidence

• A 2025 network meta-analysis comparing treatments for lumbar disc herniation found endoscopic approaches competitive with microdiscectomy (PMID 40611244)
• A 2025 meta-analysis of percutaneous transforaminal endoscopic discectomy confirmed favorable outcomes in lumbar disc herniation (PMID 40553167)
• A 2024 systematic review of complications in endoscopic spine surgery in European Spine Journal provides a comprehensive complication profile (PMID 37587257)
• A 2023 meta-analysis on anesthesia type (epidural vs. local) for percutaneous endoscopic lumbar discectomy showed both are viable options (PMID 37348062)

1. Intraoperative Endoscopic View - Working Channel Field of View

The circular field represents the endoscopic portal view. The surgeon sees structures directly illuminated through the working channel - this is the hallmark view of endoscopic spine surgery.

2. Epidural Space Entry - Ligamentum Flavum Dissection

Fig. 46.12A - Entry to the epidural space is the critical initial step. The ligamentum flavum is carefully peeled off the leading edge of the caudal lamina with a Penfield dissector.

3. Ligamentum Flavum Resection with Kerrison Rongeur

Fig. 46.12B - The Kerrison rongeur bites through the ligamentum flavum to widen the entry window. In endoscopic surgery, an endoscopic punch is used instead to fenestrate the ligamentum flavum through the working cannula.

4. Nerve Root Retraction and Disc Fragment Removal

• Left panel: Penfield dissector entering the herniated nucleus pulposus (HNP), with the nerve root, suction retractor, lamina, and facet labeled
• Right panel: Disc forceps removing disc material with the nerve root retracted, showing the disc, vertebra, and adjacent nerve structures

Fig. 46.13 - Dilation of the annular defect to facilitate disc fragment removal. HNP = Herniated Nucleus Pulposus. In the endoscopic technique, these same maneuvers are performed through the working channel under fluid-coupled direct visualization, with dedicated endoscopic instruments (graspers, probes) replacing open instruments.

Key Endoscopic Landmarks to Identify Intraoperatively

Endoscopic Discectomy: Endoscopic View + Normal Anatomy

Generated Diagram: Normal Anatomy vs. Endoscopic Field of View

From Campbell's Operative Orthopaedics (15th Ed 2026)

What the Surgeon Sees Through the Endoscope - Key Landmarks

Decompression endpoint (Technique 46.5): The nerve root pulsates to heartbeat without deformity AND the awake patient reports resolution of their typical radicular pain.