Background: Lumbar interbody fusion has gained popularity for the treatment of spondylolisthesis in recent years. Both procedures have their own advantages and disadvantages.
Objective: The aim of this study was to compare the clinical and radiological outcomes of MIS TLIF and OLIF in terms of visual analog score, Oswestry Disability Index, Intraoperative blood loss, and various other parameters.
Material and methods: This is a retrospective matched-pair comparative analysis between two groups who underwent Single level either OLIF or MISTLIF for spondylolisthesis operated from January 2017 to January 2020 at a Single institute by a Single surgeon.
Results: Statistically there is no difference in various preoperative parameters between the two groups. The intraoperative blood loss is 112.5 mL in OLIF, and 144.6 mL is MISTLIF. The duration of surgery in OLIF is 4.41 h and 3.16 h in MISTLIF. The mean duration of the requirement of postoperative analgesia is 3 months after OLIF and 5 months after MISTLIF. The time taken for returning to regular activities is less in OLIF than MISTLIF.
Conclusions: Although both OLIF and MISTLIF have almost equivalent outcomes, OLIF is better than MISTLIF in having lesser intraoperative blood loss and achieving better lordotic correction.
Keywords: MISTLIF; ODI; OLIF; VAS.