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Mortality among older adults with osteoporotic vertebral fracture

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Abstract

Summary

We evaluated whether older adults who received kyphoplasty had reduced risk of mortality compared to those who did not. In unmatched analyses, those receiving kyphoplasty were at reduced risk of death but after matching on age and medical complications, patients who received kyphoplasty were at increased risk of death.

Purpose

In previous observational studies, kyphoplasty for treatment of osteoporotic vertebral fractures has been associated with decreased mortality compared to conservative management. The purpose of this research was to determine whether older adults who received kyphoplasty had reduced risk of mortality compared to matched patients who did not.

Methods

Retrospective cohort study of US Medicare enrollees with osteoporotic vertebral fractures between 2017–2019 comparing patients who underwent kyphoplasty to those who did not. We identified 2 control groups a priori: 1) non-augmented patients who met inclusion criteria (group 1); 2) propensity-matched patients on demographic and clinical variables (group 2). We then identified additional control groups using matching for medical complications (group 3) and age + comorbidities (group 4). We calculated hazard ratios (HRs) and 95% confidence intervals (95% CIs) associated with mortality.

Results

A total of 235,317 patients (mean (± standard deviation) age 81.1 ± 8.3 years; 85.8% female) were analyzed. In the primary analyses, those who received kyphoplasty were at reduced risk of death compared to those who did not: adjusted HR (95% CI) in group 1 = 0.84 (0.82, 0.87); and in group 2 = 0.88 (0.85, 0.91). However, in post hoc analyses, patients who received kyphoplasty were at increased risk of death: adjusted HR (95% CI) in group 3 = 1.32 (1.25, 1.41) and 1.81 (1.58, 2.09) in group 4.

Conclusion

An apparent benefit of kyphoplasty on mortality among patients with vertebral fractures was not present after rigorous propensity matching, illustrating the importance of comparing similar individuals when evaluating observational data.

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Acknowledgements

We would like to acknowledge Dr. Brook I. Martin for his help with obtaining the data used for these analyses.

Funding

This work was supported by the University of Washington Clinical Learning, Evidence, And Research (CLEAR) Center for Musculoskeletal Disorders, Administrative, Methodologic and Resource Cores and NIAMS/NIH grant P30AR072572. The funding source had no role in the study design, collection, analysis and interpretation of the data, writing of the report, or the decision to submit this article for publication.

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Correspondence to Laura S. Gold.

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Statement of Human and Animal Rights

In accordance with the ethical standards as laid down in the 1964 Declaration of Helsinki and its later amendments, this study was determined to be exempt from review by the University of Washington Institutional Review Board.

Competing interests

Drs. Gold, Suri, O’Reilly, and Heagerty do not have competing interests. David F. Kalmes discloses that he has ownership/stock in Kypheze, LLC; patents involved in spine augmentation; and has received research support and royalties from Medtronic. Dr. Jeffrey G Jarvik reports royalties as a book co-editor from Springer Publishing and travel reimbursement for Faculty Board of Review from GE-Association of University Radiologists Radiology Research Academic Fellowship (GERRAF) and royalties as a chapter author from Wolters Kluwer/UpToDate.

Conflict of interest

Drs. Gold, Suri, O’Reilly, and Heagerty do not have competing interests. David F. Kalmes discloses that he has ownership/stock in Kypheze, LLC; patents involved in spine augmentation; and has received research support and royalties from Medtronic. Dr. Jeffrey G Jarvik reports royalties as a book co-editor from Springer Publishing and travel reimbursement for Faculty Board of Review from GE-Association of University Radiologists Radiology Research Academic Fellowship (GERRAF) and royalties as a chapter author from Wolters Kluwer/UpToDate.

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Gold, L.S., Suri, P., O’Reilly, M.K. et al. Mortality among older adults with osteoporotic vertebral fracture. Osteoporos Int 34, 1561–1575 (2023). https://doi.org/10.1007/s00198-023-06796-6

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