Cannabis use is associated with decreased opioid prescription fulfillment following single level anterior cervical discectomy and fusion (ACDF)

BACKGROUND: Recently, there has been increasing legalization of marijuana within the United States, however data are mixed with respect to its efficacy in treating acute pain. Our goal was to identify a difference in opioid utilization in patients with known cannabis use before anterior cervical discectomy and fusion (ACDF) compared with those that report no cannabis use. METHODS: This study was a retrospective case-control design using PearlDiver. Patients who underwent a single level ACDF between January 2010 and October 2020, were included. Patients were placed in the study group if they had a previous diagnosis of cannabis use, dependence, or abuse. Patients were excluded if they were under the age of 18 or if they had filled an opioid prescription within 3 months of their procedure. A control group was then created using a propensity score match on age, gender, and Charleston comorbidity index (CCI), and had no diagnosis of cannabis use. The primary outcome was the number of morphine milliequivalents (MME) dispensed per prescription following surgery. RESULTS: A total of 1,339 patients were included in each group. The number of patients filling prescriptions was lower in the cannabis group than in the control group at 3 days postoperatively (p<.001). The average total MME per day as prescribed was lower in the cannabis group than the control group at 60 days post-op (48.5 vs. 59.4, respectively; p=.018). CONCLUSIONS: Patients who had a previous diagnosis of cannabis use, dependence or abuse filled fewer opioid prescriptions postoperatively (at 3 days postoperatively) and required lower doses (reduced average daily MME, at 60 days postoperatively) when compared with the control group.