Clinical Context

Synovial cysts of the lumbar facet joints are:

• Degenerative in origin, arising from the facet capsule.
• Often associated with segmental instability or facet arthropathy.
• Most common at L4–L5, causing foraminal or lateral recess stenosis, compressing the exiting or traversing nerve root.

Symptoms include:

• Radiculopathy
• Neurogenic claudication
• Localized back pain

Endoscopic Surgical Solution

Indications

• Confirmed cyst on MRI compressing neural structures
• Refractory symptoms despite conservative management
• Positive correlation with facet degeneration
• Patient preference to avoid open surgery/fusion when instability is absent

Surgical Technique

• Approach: Transforaminal or interlaminar full-endoscopic route based on cyst location (foraminal vs medial)
• Anesthesia: Local with sedation or general anesthesia
• Navigation: Fluoroscopy and endoscopic visualization
• Steps:
  1. Access the facet joint capsule endoscopically
  2. Use RF ablation and micro-instruments to expose and decompress the cyst
  3. Perform cyst wall excision and evacuation of gelatinous contents
  4. Decompress adjacent neural elements
  5. Preserve the surrounding bone and ligament when feasible
• Optional: Partial SAP resection if access is limited, especially in foraminal cysts.

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Advantages of Full-Endoscopic Approach

• Minimally invasive: <1 cm incision, no muscle stripping
• No destabilization: Preserves midline structures
• Direct visualization = precise cyst removal
• Avoids fusion in cases without gross instability
• Fast recovery and outpatient surgery

Outcomes

• Symptom resolution in most cases (80–95% in the literature)
• Low recurrence when the capsule is fully removed
• Reduced operative time and hospital stay
• Lower morbidity than open decompression

Key Considerations

• Pre-op imaging: MRI + dynamic X-rays (to rule out instability)
• Recurrence: Rare if complete excision of the cyst wall is achieved
• Instability: In cases with gross facet degeneration or spondylolisthesis, fusion may be considered

Dr. Rami Hamed
Consultant Spine & Orthopedic Surgeon
Founder, DRHC – Dubai Healthcare City
📞 ‪+971 4 279 8200‬
🌐 www.drhc.ae
📍 Dubai Healthcare City, Building 52