Laminotomy: Surgical Decompression for Spinal Stenosis

Laminotomy: Targeted Spinal Decompression Procedure

A laminotomy is a minimally invasive spinal surgery that removes a portion of the lamina—the bony arch covering the spinal canal—to relieve nerve compression while preserving spinal stability.

Indications

• Lumbar/cervical spinal stenosis (narrowed canal)
• Herniated disc with radiculopathy
• Facet joint cysts compressing nerves
• Foraminal stenosis (nerve root exit narrowing)
• Failed conservative management (PT, injections, medications)

Laminotomy vs. Laminectomy

Feature	Laminotomy	Laminectomy
Bone removal	Partial (window/keyhole)	Complete lamina removal
Stability preservation	High (facet joints intact)	Lower (may require fusion)
Incision size	1–2 cm (tubular retractor)	3–6+ cm (open)
Muscle disruption	Minimal (dilators)	Significant stripping
Recovery	Faster, less pain	Longer
Indication	Focal stenosis, unilateral	Multi-level, central, instability

Surgical Technique (Microendoscopic/Minimally Invasive)

1. Small paramedian incision
2. Serial dilators create working channel
3. Microscope/endoscope visualization
4. High-speed drill removes medial lamina & ligamentum flavum
5. Decompress neural elements (thecal sac, nerve roots)
6. Optional: Discectomy, foraminotomy, cyst resection
7. Closure: Fascia, subcutaneous, skin

Outcomes & Recovery

• Success rate: 80–90% leg pain relief (radiculopathy)
• Back pain improvement: Variable (50–70%)
• Hospital: Outpatient or 23-hr stay
• Return to light activity: 2–4 weeks; heavy labor: 8–12 weeks
• Complications: Dural tear (1–3%), infection (<1%), hematoma, recurrence

Patient Selection

• Best: Focal stenosis, dominant leg symptoms, no instability/spondylolisthesis
• Relative contraindications: Multi-level central stenosis, significant axial back pain, obesity, smoking

Key advantage: Preserves posterior tension band (supraspinous/interspinous ligaments, facet capsules), reducing adjacent segment disease and fusion need.