Efficacy of Intra-articular Versus Extra-articular Bupivacaine Injection in Arthroscopic Partial Meniscectomy: A Prospective, Randomized, Double-Blind Clinical Trial

Abstract

Background: Immediate postoperative pain relief following arthroscopic partial meniscectomy remains a critical contributor to improved patient experience, early recovery of range of motion, and enhanced rehabilitation. Purpose: To evaluate the effect of intra-articular versus extra-articular bupivacaine on pain intensity and analgesic intake after arthroscopic partial meniscectomy. Study Design: Randomized controlled trial; Level of evidence, 1. Methods: This was a prospective double-blind, randomized clinical trial. All patients included underwent arthroscopic partial meniscectomy under general anesthesia. Patients were randomized into 2 groups, with 20 patients in each group. At the conclusion of the arthroscopic procedure, the intra-articular group received 10 mL 0.5% bupivacaine introduced intra-articularly and 10 mL isotonic saline 0.9% infiltrated subcutaneously around the portals. The extra-articular group received the isotonic saline intra-articularly and the bupivacaine around the portals. The primary outcome was the visual analog scale (VAS) for pain. Assessments were performed 0 to 0.5, 1 to 2, 2 to 4, and at 24 and 48 hours postoperatively. In addition, analgesic and narcotic consumption was monitored. Results: There were no differences between the groups in terms of patient demographics. VAS scores for the intra-articular group were 6, 8, 3.25, 4.3, and 4.5 at 0 to 0.5, 1 to 2, 2 to 4, 24, and 48 hours postoperatively, respectively. VAS scores for the extra-articular group were 3.8, 5, 2.9, 5.2, and 5.25, respectively. No statistically significant differences were observed between the 2 groups regarding pain intensity at all time points. There was also no statistically significant difference in analgesic consumption. Dipyrone was the preferred drug by patients from the intra-articular group, while the extra-articular group preferred to use opioids and nonsteroidal anti-inflammatory drugs. Conclusion: There were no differences in pain severity and analgesic intake between intra- or extra-articular bupivacaine administration after arthroscopic partial meniscectomy.