Observational Study of the Downstream Consequences of Inappropriate MRI of the Lumbar Spine
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Health Economics Resource Center (HERC), VA Palo Alto Health Care System, Menlo Park, CA, USA; 2Center for Innovation to Implementation, VA Palo Alto Health Care System, Menlo Park, CA, USA; 3Departments of Radiology, Neurological Surgery and Health Services, University of Washington, Seattle, WA, USA; 4Department of Clinical Epidemiology and Medical Informatics, Oregon Health & Science University, Portland, OR, USA; 5Department of Medicine, Oregon Health & Science University, Portland, OR, USA; 6Quantitative Research Unit, Stanford University Medical School, Stanford, CA, USA.
BACKGROUND: Contrary to guidelines, magnetic resonance imaging (MRI) is often ordered in the first 6 weeks of new episodes of uncomplicated non-specific low back pain. OBJECTIVE: To determine the downstream consequences of early imaging. DESIGN: Retrospective matched cohort study using data from electronic health records of primary care clinics of the U.S. Department of Veterans Affairs. PARTICIPANTS: Patients seeking primary care for nonspecific low back pain without a red flag condition or an encounter for low back pain in the prior 6 months (N = 405,965). EXPOSURE: MRI of the lumbar spine within 6 weeks of the initial primary care visit. MAIN MEASURES: Covariates included patient demographics, health history in the prior year, and baseline pain. Outcomes were lumbar surgery, prescription opioid use, acute health care costs, and last pain score recorded within 1 year of the index visit. KEY RESULTS: Early MRI was associated with more back surgery (1.48% vs. 0.12% in episodes without early MRI), greater use of prescription opioids (35.1% vs. 28.6%), a higher final pain score (3.99 vs. 3.87), and greater acute care costs ($8082 vs. $5560), p < 0.001 for all comparisons. LIMITATIONS: Reliance on data gathered in normal clinical care and the potential for residual confounding despite the use of coarsened exact matching weights to adjust for baseline differences. CONCLUSIONS: The association between early imaging and increased utilization was apparent even in a setting largely unaffected by incentives of fee-for-service care. Reduced imaging cost is only part of the motivation to improve adherence with guidelines for the use of MRI. Early scans are associated with excess surgery, higher costs for other care, and worse outcomes, including potential harms from prescription opioids. Electronic supplementary material The online version of this article (https://doi.org/10.1007/s11606-020-06181-7) contains supplementary material, which is available to authorized users. Received March 11, 2020 Accepted August 24, 2020
KEY WORDS: inappropriate magnetic resonance imaging; low back pain; retrospective matched cohort study; downstream consequences; primary care providers. J Gen Intern Med DOI: 10.1007/s11606-020-06181-7 © Society of General Internal Medicine (This is a U.S. government work and not under copyright protection in the U.S.; foreign copyright protection may apply) 2020
INTRODUCTION
Low back pain is the second most common symptomatic reason
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