Novel Indices for Lumbar Discectomy: Systemic Immune Inflammation Index, Systemic Inflammatory Response Index, Multi Inflammatory Index, and Prognostic Nutrition Index.

AIM: To evaluate systemic immune inflammation index (SII), systemic inflammatory response index (SIRI), multi-inflammatory index (MII), and prognostic nutrition index (PNI), and to compare them with the previously reported inflammation-related hematologic index in lumbar discectomy (LD).

MATERIAL AND METHODS: This was a retrospective, cross-sectional, single-center study with 105 consecutive patients who underwent surgery for LD. The study comprised three groups: Group I included data from healthy participants, Group II included data before LD, and Group III included data after LD. We analyzed mean platelet volume (MPV), platelet-lymphocyte ratio (PLR), neutrophil-lymphocyte ratio (NLR), SIRI, SII, MII, and PNI, in comparison with the Roland-Morris Disability Questionnaire (RMDQ), Oswestry Disability Index (ODI), and Visual analog scale for leg (VASLeg).

RESULTS: CRP and MPV were similar for the preoperative and postoperative periods (p=0.489). In the postoperative measurements, NLR, PLR, SII, and SIRI increased (p < 0.0001). On the contrary, PNI decreased with LD (p < 0.0001). NLR (p < 0.001), SII (p < 0.001), and SIRI (p < 0.001) were the valuable indices for LD. PLR (p < 0.001), MII-1 (p=0.004), and MII-2 (p < 0.001) also predicted LD. ODI, RMDQ, and VASLeg correlated with MII-1, MII-2, and SIRI.

CONCLUSION: LD's most substantial and valuable indices were NLR, SII, and SIRI. Regarding superiority to SII and NLR, SIRI showed significant agreement with the scales and drew a more appropriate marker profile for LD than MII-1, MII-2, and PNI.