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Preoperative patient-reported outcome score thresholds predict the likelihood of reaching MCID with surgical correction of adult spinal deformity

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Abstract

Background context

Preoperative (pre-op) identification of patients likely to achieve a clinically meaningful improvement following surgery for adult spinal deformity (ASD) is critical, especially given the substantial cost and comorbidity associated with surgery. Even though pain is a known indication for surgical ASD correction, we are not aware of established thresholds for baseline pain and function to guide which patients have a higher likelihood of improvement with corrective surgery.

Purpose

We aimed to establish pre-op patient-reported outcome measure (PROM) thresholds to identify patients likely to improve by at least one minimum clinically important difference (MCID) with surgery for ASD.

Study design

This is a retrospective cohort study using prospectively collected data.

Patient sample

We reviewed 172 adult patients’ charts who underwent corrective surgery for spinal deformity.

Outcome measures

Included measures were the Visual Analog Scale for pain (VAS), Oswestry Disability Index (ODI), and Scoliosis Research Society-22 (SRS-22). Our primary outcome of interest was improvement by at least one MCID on the ODI and SRS-22 at 2 years after surgery.

Methods

As part of usual care, the VAS, ODI, and SRS-22 were collected pre-op and re-administered at 1, 2, and 5 years after surgery. MCIDs were calculated using a distribution-based method. Determining significant predictors of MCID at two years was accomplished by Firth bias corrected logistic regression models. Significance of predictors was determined by Profile Likelihood Chi-square. We performed a Youden analysis to determine thresholds for the strongest pre-op predictors.

Results

At year two, 118 patients (83%) reached MCID for the SRS and 127 (75%) for the ODI. Lower pre-op SRS overall, lower pre-op SRS pain, and higher pre-op SRS function predicted a higher likelihood of reaching MCID on the overall SRS (p < 0.05). Higher pre-op ODI, lower SRS pain and self-image, and higher SRS overall predicted a higher likelihood of reaching MCID on the ODI (p < 0.05). An ODI threshold of 29 predicted reaching MCID with a sensitivity of 0.89 and a specificity of 0.64 (AUC = 0.7813). An SRS threshold of 3.89 predicted reaching MCID with a sensitivity of 0.93 and specificity of 0.68 (AUC = 0.8024).

Conclusions

We identified useful thresholds for ODI and SRS-22 with acceptable predictive ability for improvement with surgery for ASD. Pre-op ODI, SRS, and multiple SRS subscores are predictive of meaningful improvement on the ODI and/or SRS at 2 years following corrective surgery for spinal deformity. These results highlight the usefulness of PROMs in pre-op shared decision-making.

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Authors and Affiliations

Authors

Contributions

AL-M BA: Study design, manuscript daft, review, final approval and accountable for the work to be published. ET MD: Design, manuscript preparation, review, final approval, overall study management and accountable for the work to be published. KJB, MD: Study conception, manuscript draft, review, final approval and accountable for the work to be published. DS, PhD: Study design, data collection, manuscript preparation, review, final approval and accountable for the work to be published. TCL MD: Study conception, data analysis, manuscript preparation, review, final approval and accountable for the work to be published. JKS, MD: Study conception, manuscript preparation, review, final approval and accountable for the work to be published. MJM, PhD: Study conception, data analysis, manuscript preparation, review, final approval and accountable for the work to be published.

Corresponding author

Correspondence to Eeric Truumees.

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Conflict of interest

Andrea Leyton-Mange, Devender Singh, Tiffany C Liu, Michael J Mahometa: None; Eeric Truumees: Stryker spine (royalty); Doctoral research group (stock); Relievant Medsystems, Stryker, Medtronic, KUROS, Seikagau Corporation (research support); North American Spine Society (board member); Kevin Bozic: Agency for Healthcare Research and Quality (research support); Harvard business school institute for strategy and competitiveness (consultant-unpaid); Carrum Health (stock options); Centers for Medicare and Medicaid Services and Cardinal Analytx (consultant-paid); John K Stokes: Genesys spine (royalty); Difusion and Summit Medventures (stock); Matthew J Geck: Difusion (stock), SpineHope (Board member:unpaid).

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Appendix

Appendix

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Table 10 MCID counts separated by gender

10

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Leyton-Mange, A., Truumees, E., Bozic, K.J. et al. Preoperative patient-reported outcome score thresholds predict the likelihood of reaching MCID with surgical correction of adult spinal deformity. Spine Deform 9, 207–219 (2021). https://doi.org/10.1007/s43390-020-00171-9

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