Mepivacaine as a spinal anesthetic for rapid recovery in total knee arthroplasty (TKA) has not been assessed. The purpose of this study is to compare spinal mepivacaine vs bupivacaine for postoperative measures in patients undergoing primary TKA.
Retrospective review of a prospectively collected single-institution database was performed on 156 consecutive patients who underwent primary TKA. Fifty-three patients were administered mepivacaine and 103 patients were administered bupivacaine. Primary outcomes were urinary retention, length of stay, pain control, opioid consumption, and distance associated with physical therapy. Statistical analysis with univariate logistic regression was performed to evaluate the effect of anesthetic with primary outcomes.
Patients undergoing TKA with mepivacaine had a shorter length of stay (28.1 ± 11.2 vs 33.6 ± 14.4 hours, P = .002) and fewer episodes of straight catheterization (3.8% vs 16.5%, P = .021) compared to bupivacaine. Patients administered mepivacaine exhibited slightly higher VAS pain scores and morphine consumption in the postanesthesia care unit (1.3 ± 1.9 vs 0.5 ± 1.3, P = .002; 2.2 ± 3.3 vs 0.8 ± 2.1 equivalents/h, P = .002), but otherwise exhibited no difference in VAS scores or morphine consumption afterwards. There was no need to convert to general anesthesia or transient neurologic symptom complication in either group.
Mepivacaine for spinal anesthesia with TKA had adequate duration to complete the surgery and facilitated a more rapid recovery with less urinary complications and a shorter length of stay. Patients administered mepivacaine did not display worse pain control or transient neurologic symptoms afterwards.