The Impact of L4-5 Minimally Invasive Transforaminal Lumbar Interbody Fusion on Two-year Adjacent-Level Parameters

This study evaluates the impact of L4-5 minimally invasive surgery (MIS)-TLIF on adjacent-level parameters. This is a retrospective study performed on consecutive patients between January 2015-December 2019. The index- and adjacent-level segmental lordosis (SL) and disc angle (DA) were measured. Patient-reported outcomes (PROs) were collected preoperatively and at 3-24 months postoperatively. Factors influencing changes in adjacent-level parameters and the occurrence of adjacent segment degeneration (ASDeg) were assessed. One hundred and seventeen adult patients, averaging 65.5 years of age and slight preponderance of female (56.4%), were analyzed. L4-5 SL decreased at 2 years (p