J Minim Invasive Spine Surg Tech.  2024 Jan;9(Suppl 1):S14-S23. 10.21182/jmisst.2023.01032.

Comparative Analysis of Uniportal and Biportal Endoscopic Transforaminal Lumbar Interbody Fusion in Early Learning Stage: Technical Considerations and Radiological Outcomes

• Kim JY
• Hong HJ
• Kim HS
• Heo DH
• Choi SY
• Kim KM
• Lee DC
• Park CK

• KMID: 2562243
• DOI: http://doi.org/10.21182/jmisst.2023.01032

Abstract

Objective
This study compared the clinical and radiological outcomes of uniportal endoscopic and biportal endoscopic transforaminal lumbar interbody fusion (TLIF) for lumbar degenerative disease during the early learning stage of the technique.
Methods
We retrospectively analyzed patients who underwent uniportal endoscopic TLIF (n=15) and biportal endoscopic TLIF (n=19) between January and October 2021 during the first year of adoption of these techniques. Radiological parameters, including Bridewell fusion and subsidence grading, were evaluated by x-ray and computed tomography (CT) at 3-month, 6-month, and 1-year follow-up visits. Clinical outcomes were evaluated using the visual analogue scale (VAS) and the Oswestry Disability Index (ODI).
Results
Uniportal endoscopic TLIF showed significantly higher frequencies of intraoperative endplate injuries (uniportal [20%] vs. biportal [0%], p=0.01) and 1-year cage subsidence (uniportal [60%] vs. biportal [26.3%], p=0.04) than biportal endoscopic TLIF. The 1-year fusion rates did not differ significantly between the 2 surgical groups (uniportal [93.3%] vs. biportal [89.5%], p=0.37). Neural complications such as postoperative dysesthesia and dural tears occurred in uniportal endoscopic TLIF. There were no significant differences in the VAS for back and leg pain or ODI.
Conclusion
Complete endplate preparation under endoscopic guidance improved interbody fusion, and this procedure may be feasible in the early learning stage, regardless of the type of endoscope. Both endoscopic TLIF techniques achieved good clinical outcomes and fusion rates. However, unskilled use of the cage guide device caused endplate breakage and neural injury during uniportal endoscopic cage insertion. Uniportal endoscopic TLIF may require more experience for appropriate cage insertion.

Keyword

Endoscopy; Lumbar vertebrae; Spinal stenosis