Regional anesthesia provides limited decreases in opioid use following distal tibia and ankle fracture surgery.

Abstract

Regional anesthesia (RA) is used for pain control, but its impacts on the orthopedic trauma population are not well known. This study evaluated the impact of peripheral nerve blocks after distal tibia and ankle fracture repair on opioid use and pain scores and quantified the magnitude and duration of any changes. This retrospective cohort study included patients treated operatively for distal tibia and ankle fractures over a 5-year period, both with and without peripheral nerve blocks. Total inpatient 5mg oxycodone equivalents (OEs) used in the post-operative period, from 0-24, 24-48, to 48-72h and maximum visual analog scale (VAS) pain ratings from 0-24, 24-48, to 48-72h were recorded. 540 non-polytrauma patients and 183 polytrauma patients were included. Patients in the non-polytrauma group who received nerve blocks required fewer opioids on post-operative day (POD) 1 compared to the non-nerve block group (4.8 [95% CI 4.2-5.4] vs. 10.5 [95% CI: 9.2-11.8]; p < 0.001) and had lower VAS scores on POD1 (5.0 [95% CI 4.6-5.4] vs. 7.7 [95% CI: 7.3-8.1]; p < 0.001). However, there were no differences between these groups on POD2 or POD3 and no differences at any timepoints in the polytrauma group. Patients with isolated distal tibia and ankle fractures who receive peripheral nerve blocks demonstrate modest reductions in inpatient opioids and pain scores on POD1. However, there are no clear benefits beyond this point. Furthermore, polytrauma patients do not experience any reductions in opioid consumption or pain scores.