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Objective: Determine if patients undergoing PLIF or TLIF surgery achieved improvement in the score of ODI and SF-36 questionnaires one year after surgery.  Methods: Retrospective, single-center and non-randomized study. Patients submitted to spinal surgery using the PLIF or TLIF technique were included who completed the ODI and SF-36 questionnaires at least at the preoperative visit, and one year after surgery. Patients were divided into two groups, Group 1 (1 surgery level) and Group 2 (&gt; 1 surgery level) and the ODI and SF-36 scores were compared for improvement.  Results: The mean age was 47 years, with 52% of males (13/25) and mean of 5 days of hospital stay. Patients presented a significant improvement of ODI questionnaire (p&lt;0.001) and in all SF-36 domains except in General Health State (p=0.58). In each group, it was observed that patients submitted to more than one level of surgery had greater blood loss and shorter hospital stay; however, the improvement obtained in ODI and SF-36 compared to the one-level surgery group was similar.  Conclusions: PLIF and TLIF techniques are effective and lead to improved scores in ODI and SF-36 questionnaires one year after surgery. Patients undergoing two or more levels of instrumentation showed significant and similar improvement in ODI and SF-36. Level of evidence II, Single-Center Retrospective Study.

IMPROVEMENT OF ODI AND SF-36 QUESTIONNAIRES SCORE AFTER ONE YEAR OF PLIF OR TLIF