A Multimodal Pain Management Regimen Utilizing Adductor Canal Block in a Veterans Affairs Population Decreases Opioid Consumption Following Total Knee Arthroplasty.
Abstract Background: Ease of access to opioids in the perioperative period is a risk factor for subsequent opioid abuse. The purpose of this study was to quantify a decrease in opioid consumption following implementation of a new analgesic protocol after total knee arthroplasty (TKA). Methods: A retrospective cohort study was performed analyzing patients who underwent TKA at a Veterans Affairs medical center. Patients were divided into two groups by multimodal analgesic regimen: Analgesia with intraoperative general anesthesia, a patient controlled analgesia pump, and oral opioids (Traditional group) or analgesia with intraoperative spinal anesthesia, a multimodal medication regimen, and an adductor canal block (Protocol group). Results: A total of 533 TKAs were included. The intravenous morphine equivalent dose (MED) requirement was 178.2 ± 98.0 for Traditional and 12.0 ± 24.6 for Protocol groups (p < 0.001). Total opioid MED requirement was 241.7 ± 120.1 for Traditional and 74.8 ± 42.7 in Protocol groups (p < 0.001). The Protocol group required only 6.7% of the intravenous opioids and 30.9% of the total opioids used by the Traditional group. No difference in oral opioid requirements was found (p = 0.849). The Traditional group required more opioid refills at the first postoperative visit (p < 0.001). Conclusions: The described analgesic protocol resulted in significant decreases in intravenous and total opioid requirement, and lower rates of opioid prescriptions at the first postoperative visit. These findings demonstrate a decrease in opioid utilization with modern perioperative analgesia protocols and reinforce recommendations by the CDC and AAOS to decrease opioid exposure and access. Trial Registration: Not applicable