Abstract:Objective To investigate the therapeutic effect of modified lateral lumbar interbody fusion (crenel lateral interbody fusion, CLIF) in patients with degenerative lumbar spondylolisthesis complicated with lumbar spinal stenosis and its influence on postoperative adverse events.Methods A total of 286 patients diagnosed with degenerative lumbar spondylolisthesis and lumbar spinal stenosis who underwent treatment at our hospital between March 2018 and October 2024 were enrolled. Patients were randomly divided into a control group (n = 143) and an observation group (n = 143) using a random number table. The control group received transforaminal lumbar interbody fusion (TLIF), while the observation group underwent CLIF. Perioperative indicators were recorded. Preoperative and 24-hour postoperative levels of inflammatory cytokines and stress markers were compared between the two groups. At 6 months postoperatively, pain severity and lumbar function were assessed, and intervertebral height, foraminal height, lumbar lordosis (LL), and segmental lordosis (SL) were measured on X-ray images. Adverse events, including dural tear, infection, and nerve injury, were documented.Results The observation group had shorter operative duration, less intraoperative blood loss, and shorter postoperative ambulation time than in the control group (P < 0.05). There were no significant differences in tumor necrosis factor-α (TNF-α), interleukin-6 (IL-6), or interleukin-8 (IL-8) levels between the two groups before treatment (P > 0.05). After treatment, levels of TNF-α, IL-6, and IL-8 were significantly lower in the observation group compared with the control group (P < 0.05), and the changes in these indicators before and after treatment were also significantly smaller in the observation group (P < 0.05). Before treatment, there were no significant differences in adrenocorticotropic hormone (ACTH) and cortisol (Cor) levels between the two groups (P > 0.05). After treatment, ACTH and Cor levels were significantly lower in the observation group (P < 0.05), and the pre- to post-treatment differences were also significantly smaller in the observation group (P < 0.05). No significant differences were found between the two groups in Visual Analogue Scale (VAS) scores, Japanese Orthopaedic Association (JOA) scores, or Oswestry Disability Index (ODI) scores before treatment (P > 0.05). After treatment, VAS and ODI scores were significantly lower, while JOA scores were significantly higher, in the observation group compared with the control group (P < 0.05). The changes in VAS, JOA, and ODI scores from pre- to post-treatment were also greater in the observation group (P < 0.05). Before treatment, there were no significant differences between the two groups in intervertebral height, foraminal height, LL, or SL (P > 0.05). After treatment, all four parameters were significantly greater in the observation group than in the control group (P < 0.05), and the pre- to post-treatment differences were also greater in the observation group (P < 0.05). The overall incidence of adverse events was significantly lower in the observation group compared with the control group (P < 0.05).Conclusion CLIF improves postoperative lumbar functional recovery and reduces the risk of adverse events in patients with degenerative lumbar spondylolisthesis complicated with lumbar spinal stenosis.