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Study Design: Retrospective cohort.Objective: We evaluate the correlation of the Patient-Reported Outcomes Measurement Information System for physical function (PROMIS-PF) with legacy patient-reported outcome measures (PROMs) in patients undergoing minimally invasive transforaminal lumbar interbody fusion (MIS TLIF) up to 2 years postoperatively.Summary Of Background Data: PROMIS-PF has not been validated past 6 months following MIS TLIF.Methods: A surgical registry was retrospectively reviewed for eligible MIS TLIFs between May 2015 and September 2017. Inclusion criteria were primary, one- or two-level MIS TLIFs for degenerative spinal pathology. Patients without preoperative or 2-year follow up PROMIS-PF surveys were excluded. Demographic, perioperative, and PROMs including Visual Analog Scale (VAS) back, VAS leg, Oswestry Disability Index (ODI), 12-Item Short Form (SF-12) physical component summary (PCS) scores, and PROMIS-PF at preoperative and postoperative timepoint (e.g., 6 weeks, 12 weeks, 6 months, 1 year, and 2 years). A paired t test evaluated PROM improvement from baseline. The relationship of PROMIS-PF with VAS back, VAS leg, SF-12 PCS, and ODI was evaluated with a Pearson correlation coefficient.Results: The 68-subject cohort was 41.2% female, with an average age of 52.9 years; 44.1% were obese, and the majority underwent one-level fusions (95.6%). Pain (VAS back, VAS leg) and disability metrics (ODI) demonstrated significant improvement at all timepoints following MIS TLIF when compared to baseline (all P < 0.001). Physical function (SF-12 PCS, PROMIS-PF) demonstrated significant postoperative improvement at 12 weeks, 6 months, 1 year, and 2 years (all P < 0.001). All evaluated timepoints, with the exception of preoperative VAS back scores, revealed strong PROMIS-PF correlations with VAS back, VAS leg, ODI, and SF-12 PCS.Conclusion: PROMIS-PF demonstrated a strong correlation with pain (VAS back, VAS leg), disability (ODI) and physical function (SF-12) at all postoperative follow-ups through 2 years. Our study provides longitudinal evidence for utilizing PROMIS-PF as a valid physical function measure among patients undergoing MIS TLIF.Level Of Evidence: 4. [ABSTRACT FROM AUTHOR]

Study Design: Retrospective cohort.Objective: To investigate and establish minimum clinically important differences (MCID) for Patient Health Questionnaire-9 (PHQ-9) among patients undergoing minimally invasive transforaminal lumbar interbody fusion (MIS TLIF).Summary Of Background: Spine surgery is linked to postoperative improvements in anxiety, depression, and mental health. These improvements have been documented using patient-reported outcome measures such as PHQ-9. Few studies evaluated the clinical significance of PHQ-9 for lumbar spine surgery.Methods: Patients who underwent single-level, primary MIS TLIF from 2015 to 2017 were retrospectively reviewed in a prospective database. Patients with incomplete preoperative and 2-year postoperative PHQ-9 surveys were excluded. Demographic and perioperative characteristics were recorded. PHQ-9, 12-Item Short Form (SF-12), and Veterans RAND 12-Item Health Survey (VR-12) Mental Component Summary (MCS) were collected at preoperative, 6-week, 12-week, 6-month, 1-year, and 2-year intervals. MCID was calculated using anchor and distribution-based methods. SF-12 served as an anchor. MCID was assessed using mean change methodology, four receiver operating characteristic curve assessments, and standard error measurement. Cutoff values were selected from receiver operating characteristic curve analysis. MCID achievement rates for all patient-reported outcome measures were calculated.Results: A total of 139 patients met inclusion criteria, with a mean age of 55 years and 39% females. The most common spinal pathology was radiculopathy (92%). MCID analysis revealed the following ranges of values: 2.0 to 4.8 (PHQ-9), 6.7 to 12.1 (SF-12 MCS), and 7.5 to 15.9 (VR-12 MCS). Final MCID thresholds were 3.0 (PHQ-9), 9.1 (SF-12 MCS), and 8.1 (VR-12 MCS). MCID achievement at 2-years for PHQ-9, SF-12 MCS, and VR-12 MCS was 89.2%, 85.6%, and 84.9% respectively.Conclusion: Our 2-year postoperative MCID analysis is the first mental health calculation from an MIS TLIF cohort. We report a 2-year MCID value for PHQ-9 of 3.0 (2.0-4.8). MCID values for mental health instruments are important for determining overall success of lumbar spine surgery.Level of Evidence: 3. [ABSTRACT FROM AUTHOR]