Effectiveness of biportal endoscopic lumbar interbody fusion using the multi-layer bone grafting technique: a retrospective study from Vietnam.

Study Design: A retrospective cohort study.

Purpose: This study aimed to describe the surgical technique of biportal endoscopic (BE) lumbar interbody fusion (LIF) using a multi-layer bone grafting method and to investigate its clinical effectiveness in treating patients with grade I or II lumbar spondylolisthesis (LS).

Overview Of Literature: Previous studies have described BE-LIF; however, these reports predominantly originate from advanced centers in developed countries, using sophisticated implants such as dual transforaminal LIF (TLIF), oblique LIF, or titanium cages.