Does Reducing the Concentration of Bupivacaine When Performing Therapeutic Shoulder Joint Injections Impact the Clinical Outcome?

AJR. American Journal of Roentgenology
Michael G Fox, James T Patrie

Abstract

Mixtures of local anesthetics and steroids are routinely injected intraarticularly to temporarily relieve joint pain, even though local anesthetics have been reported to cause chondrocyte death in a dose- and time-dependent manner. This study aimed to determine if intraarticular injections of bupivacaine 0.5% and bupivacaine 0.25% would provide similar pain relief. All fluoroscopically guided glenohumeral joint injections performed using 2.5 mL of bupivacaine and 0.5 mL (20 mg) of triamcinolone acetonide over a 42-month period were included if a pain score was recorded before, 5-10 minutes after, and 1 week after injection. Pain reduction of more than 2 points was considered much improved clinically with pain reduction of more than 1 point considered the minimum clinically important difference (MCID) threshold. Statistically significant and much improved pain reduction was achieved using both bupivacaine 0.5% and 0.25% 5-10 minutes (-3.7 points; 95% CI, -3.4 to -4.0 points; p ≤ 0.001; and -3.3 points; 95% CI, -3.0 to -3.5 points; p ≤ 0.001) and 1 week (-2.5 points; 95% CI, -2.2 to -2.9 points; p ≤ 0.001; and -2.1 points; 95% CI, -1.8 to -2.3 points; p ≤ 0.001) after injection, respectively. Adjusting for age, sex, pain score be...Continue Reading

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