Abstract
Purpose
To identify clinical predictors and build prediction models for 1-year patient-reported outcomes measures (PROMs) after lumbar decompressive surgery for disc herniation or spinal stenosis.
Methods
The study included 1835 cases, with or without additional single-level fusion, from a single centre from 2008 through 2020. General linear models imputed with 37 clinical variables identified 18 significant 1-year PROM predictors for retention in development models. Interaction of surgical indication with each predictor was tested. Temporal validation was conducted at the same centre on cases through 2021. R2 was used to measure goodness-of-fit, and area under curve (AUC) used to measure classification to a satisfactory symptom state (Oswestry Disability Index (ODI) ≤ 22; back or leg pain ≤ 30 out of 100).
Results
A total 1228 (67%) had complete data for inclusion in model development. Predictors of ODI were baseline PROMs (ODI, back pain, leg pain), work status, condition duration, previous lumbar operation, multiple-joint osteoarthritis, female, diabetes, current smoker, rheumatic disorder, lower limb arthroplasty, mobility aided, provider status, facet cyst, scoliosis, and age, with BMI significantly associated with stenosis. Temporal validation (n = 188) found the ODI model R2 was 0.29 (95% confidence intervals (CI) 0.18–0.40) and AUC was 0.74 (95% CI 0.67–0.81). Back and leg pain models had lower R2 (0.12–0.14) and AUC (0.68–0.69) values.
Conclusion
Important PROM predictors are baseline PROMs, specific co-morbidities, work status, condition duration, previous lumbar operation, female, and smoking status. The ODI model predicted the likelihood of achieving a satisfactory state of both disability and pain.
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Acknowledgements
We thank Lennel Lutchman for British Spine Registry compliance and data contribution. We thank present and past physiotherapy staff and administration staff for patient-reported outcome measure collection and collation. We thank present and past Spire Norwich Hospital medical record staff in the hospital records audit. We thank Phillip Mobbs and Adam Geere for programming the researcher resource website and online Web calculator.
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Conceptualization was performed by JHG and ASR; data curation was performed by JHG, GNS, AJC and ASR; methodology was performed by JHG and PRH; formal analysis and investigation were performed by JHG and PRH; writing—original draft preparation was performed by JHG; writing—review and editing was performed by JHG, PRH, GNS, AJC and ASR; supervision was performed by JHG and ASR. All authors read and approved the final manuscript.
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The study was approved by the Spire Norwich Hospital Ethics Committee and the Norfolk and Norwich University Hospital NHS Foundation Trust Audit and Governance Committee (ref:43119).
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Geere, J.H., Hunter, P.R., Swamy, G.N. et al. Development and temporal validation of clinical prediction models for 1-year disability and pain after lumbar decompressive surgery. The Norwich Lumbar Surgery Predictor (development version). Eur Spine J 32, 4210–4219 (2023). https://doi.org/10.1007/s00586-023-07931-x
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DOI: https://doi.org/10.1007/s00586-023-07931-x