The Oswestry Disability Index (ODI) is one of the most commonly used patient-reported outcome instruments, but completion of this 10-question survey can be cumbersome. Tools from the Patient-Reported Outcomes Measurement Information System (PROMIS) are an alternative, and potentially more efficient, means of assessing physical, mental, and social outcomes in spine surgery. Authors of this retrospective study assessed whether scores on the 4-item surveys of function and pain from the PROMIS initiative correlate with those on the ODI in lumbar spine surgery.
Patients evaluated in the adult neurosurgery spine clinic at a single institution completed the ODI, PROMIS Short Form v2.0 Physical Function 4a (PROMIS PF), and PROMIS Short Form v1.0 Pain Interference 4a (PROMIS PI) at various time points in their care. Score data were retrospectively analyzed using linear regressions with calculation of the Pearson correlation coefficient.
Three hundred forty-three sets of surveys (ODI, PROMIS PF, and PROMIS PI) were obtained from patients across initial visits (n = 147), 3-month follow-ups (n = 107), 12-month follow-ups (n = 52), and 24-month follow-ups (n = 37). ODI scores strongly correlated with PROMIS PF t-scores at baseline (r = −0.72, p < 0.0001), 3 months (r = −0.79, p < 0.0001), 12 months (r = −0.85, p < 0.0001), and 24 months (r = −0.89, p < 0.0001). ODI scores also correlated strongly with PROMIS PI t-scores at baseline (r = 0.71, p < 0.0001), at 3 months (r = 0.82, p < 0.0001), at 12 months (r = 0.86, p < 0.0001), and at 24 months (r = 0.88, p < 0.0001). Changes in ODI scores moderately correlated with changes in PROMIS PF t-scores (r = −0.68, p = 0.0003) and changes in PROMIS PI t-scores (r = 0.57, p = 0.0047) at 3 months postoperatively.
A strong correlation was found between the ODI and the 4-item PROMIS PF/PI at isolated time points for patients undergoing lumbar spine surgery. Large cohort studies are needed to determine longitudinal accuracy and precision and to assess possible benefits of time savings and improved rates of survey completion.
ABBREVIATIONSCAT = computer-adaptive testing; ODI = Oswestry Disability Index; PRO = patient-reported outcome; PROMIS = Patient-Reported Outcomes Measurement Information System; PROMIS PF = PROMIS Short Form v2.0 Physical Function 4a; PROMIS PI = PROMIS Short Form v1.0 Pain Interference 4a.
Correspondence Paul Park: University of Michigan, Ann Arbor, MI. email@example.com.
INCLUDE WHEN CITING Published online August 9, 2019; DOI: 10.3171/2019.5.SPINE19400.
Disclosures Dr. Chang has consulted for Globus Medical, K2M, and SpineGuard and has received research funding from Medtronic. Dr. Schwalb has consulted for Bluerock and Guidepoint, received research support from Medtronic, and received salary support from Blue Cross Blue Shield of Michigan. Dr. Abdulhak has been a consultant for Seaspine and Ulrich Medical USA and has received clinical or research support from Blue Cross Blue Shield of Michigan for the study described. Dr. Park is a consultant for Allosource, Globus Medical, NuVasive, and Medtronic and has received royalties from Globus Medical and research support from Pfizer and Vertex.
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