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In Spite of Limited Generalizability, New Findings Reinforce the Lesson That Long-Term Opioid Use Is Not Attributable to Surgical Pain: Commentary on an article by Andrew J. Schoenfeld, MD, MSc, et al.: “Risk Factors for Prolonged Opioid Use Following Spine Surgery, and the Association with Surgical Intensity, Among Opioid-Naive Patients”

Barth, Robert J. PhD

Journal of Bone & Joint Surgery - American Volume: 2 August 2017 - Volume 99 - Issue 15 - p e84
doi: 10.2106/JBJS.17.00519
Commentary and Perspective
Disclosures
Related Article

Barth Neuroscience, Chattanooga, Tennessee

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Commentary

Schoenfeld et al. have provided good news: prolonged opioid use following spine surgery was extremely rare in their large sample of opioid-naive patients from a national database. This is good news because of the abundance of harmful effects that have been established for opioids1. The resulting article emphasizes, “The outcomes documented here directly contravene the narrative that patients who undergo spine surgery, once started on prescription opioids following surgery, are at a high risk of sustained opioid use.”

Unfortunately, the mechanism by which this research contravened that narrative involved exclusion criteria that compromise the relevance of the findings for the majority of surgical patients. For example, the findings cannot be confidently generalized to any of the following groups because they were all excluded from the project: patients who are eligible for Medicare or Medicaid (approximately 34% of the U.S. population2), those with a history of cancer in the previous year (approximately 5% of the population3,4), those with a history of trauma in the previous year (approximately 10% of the population4,5), and those with a history of opioid use in the 6 months prior to surgery (after the sample had been reduced by the above exclusions, this eliminated 63% of the remaining cases).

Consequently, it appears as if this sample was representative of roughly 19% of spine surgery candidates, at best.

This reduced representativeness is noteworthy beyond the numbers because several of the exclusion criteria have unique relevance to the study’s focus on opioid use. The importance of excluding preoperative opioid users is obvious, but it is worth noting that such preoperative use has indeed been found to predict elevated postoperative use6. By excluding those who were eligible for Medicaid, the researchers eliminated a risk factor for higher rates of opioid prescriptions and greater doses per prescription7. By excluding those with a history of opioid use, those who are eligible for Medicaid, and those who had a history of trauma, the researchers excluded 3 correlates of mental illness (including substance abuse)6,8-13. Mental illness is, itself, a predictor of future opioid use14. Consequently, the exclusion criteria reduced the prominence (within the sample) of an additional risk factor for opioid use: mental illness. (Even so, these new findings still lend support to previous findings of mental illness predicting long-term opioid use.)

While this exclusion of risk factors associated with opioid use compromises the generalizability of the findings, it also allows the findings to reinforce a generalizable lesson. Specifically, the low rate of long-term opioid use that resulted from such exclusions essentially replicates the findings of prior research that persistent postoperative opioid use “is not due to surgical pain” but is instead due to “addressable patient-level predictors.”15 The new findings indicate that any patient who is still requesting opioids as of 1 month after spine surgery is clearly an outlier (at least for cases that are free from relevant, objectively verifiable complications) and is consequently in need of evaluation for “addressable patient-level predictors” (and in need of health care that addresses the predictors that are found to be relevant for that patient). The findings are also supportive of guidelines that call for surgical-discharge prescriptions of opioids to be limited to ≤2 weeks16,17.

It should also be noted that this study’s exclusion criteria appear to have produced another unusual result (in conjunction with the unusually low rate of prolonged opioid use). Specifically, the researchers identified low rates of mental health disorders in their sample. This is consistent with the low rate of long-term opioid use because mental illness is correlated with opioid use6,8-10,14. Because several of the exclusion criteria are associated with elevated rates of mental illness6,8-13, such exclusion appears to account for the low rates of mental health disorders. Further, the researchers only analyzed for an extremely limited set of mental health disorders and failed to analyze for the types of mental illness that dominate chronic pain presentations (e.g., personality disorders18,19 and the historical but scientifically validated concept of somatoform disorders20,21). Consequently, readers are warned that the low rates of mental health disorders that are reported for this sample are not generalizable to the entire population of spine surgery candidates and that previous research has revealed an elevated rate of mental illness among spine surgery candidates22.

With all of the above in mind, the lesson is that, while surgery is statistically a risk factor for long-term opioid use15,23-26, that risk is largely attributable to confounding factors such as preoperative opioid use, a history of trauma, and Medicaid eligibility (all of which are correlates of mental illness, which is, itself, a risk factor for opioid use). Findings from this study and others have highlighted additional risk factors for prolonged postoperative opioid use, which include relatively low socioeconomic status (as noted in the current study), tobacco use15, preoperative pain15, abnormal body mass index (high or low)24, middle age (highest for those aged 50 to 59 years)24, and benzodiazepine use26.

Disclosure: The author indicated that no external funding was received for any aspect of this work. The Disclosure of Potential Conflicts of Interest form is provided with the online version of the article (http://links.lww.com/JBJS/E282).

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