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Objective: The purpose of this study was to investigate the effect of the modified thoracolumbar interfascial plane block (TLIP) on postoperative analgesia and quality of recovery in patients undergoing lumbar disk surgery. Method: Ninety patients scheduled for lumbar disk surgery were divided into a control group (Group C) and a modified TLIP block group (Group T). Controlled analgesia was administered to both groups. Pain evaluation was performed at 30 min and at 1., 2., 4., 8.,12., and 24. hrs using a VAS scale, with patients at rest and duringand patients completed the QoR-40 quality of recovery inventory. Results: Fentanyl used during postoperative 24 hours was 742.5±220.3 mcg in Group C and 446.0±241.98 in Group T. Postoperative fentanyl consumption was statistically significantly lower in Group T (p<0.001) with a statistically significant intergroup difference. The patient's pain, physical independence, physical comfort, psychological support, and emotional support were compared using the QoR-40 questionnaire survey. Significant differences in favor of Group T were observed (p<0.001, p=0.017, p=0.002, p=0.001 and p<0.001, respectively). Static and dynamic pain scores in Group C and Group T were recorded at 30 min and at 1, 2, 4, 8, 12, and 24 h. Mean static scores were statistically significantly different in favor of Group T with the exception of 8 th and 12 h assessments (p<0.05). Dynamic scores were statistically significantly different in favor of Group T at all time points (p<0.05). Conclusion: Pain scores, opioid consumption and QoR-40 values after lumbar disk surgery were superior in the group undergoing TLIP. We think that the modified TLIP block may be an important method in terms of postoperative analgesia and patient recovery for lumbar spinal disk surgery.