Effects of perineural catheter location—adductor canal versus femoral—on supplemental opioid requirements after tricompartment knee arthroplasty. Data presented are the percentage of each treatment group free of intravenous opioids for the previous 12 h at each time point (A); Kaplan–Meier estimates of the cumulative percentages of subjects free of intravenous opioids for the previous 12 h at each time point and subsequent time points (B); and mean oral and intravenous supplemental opioid requirements (morphine equivalents) as median (horizontal bar) with 25th to 75th (box) and 10th to 90th (whiskers) percentiles (C). Subjects with a continuous adductor canal block were free from intravenous opioids for the previous 12 h in a median of 32 h (interquartile range, 14 to 48 h) compared with 32 h (14 to 50 h) for those with a continuous femoral nerve block (P > 0.99).