In vivo effects of a single intra-articular injection of 2% lidocaine or 0.5% bupivacaine on articular cartilage of normal horses.
Authors: Piat Perrine, Richard Hélène, Beauchamp Guy, Laverty Sheila
Journal: Veterinary surgery : VS
Summary
# Editorial Summary This 2012 investigation examined whether intra-articular local anaesthetic injections—commonly used diagnostically and therapeutically in equine practice—might alter cartilage metabolism, using synovial fluid biomarkers as the measurement tool. Six mares received either 0.5% bupivacaine or 2% lidocaine in one joint with saline placebo in the contralateral joint (intercarpal joints for bupivacaine, tarsocrural for lidocaine), with treatments reversed after a two-week washout to yield six joints per agent. Both local anaesthetics significantly elevated biomarkers of cartilage matrix synthesis—specifically CS846-aggrecan and CPII-type II collagen—suggesting an anabolic or constructive effect on cartilage; bupivacaine additionally decreased collagen degradation markers (C2C and C1,2C), indicating reduced breakdown. The anabolic response raises important questions about mechanism: whilst the increased synthesis markers suggest a potentially beneficial stimulus, the authors note this could reflect compensatory activity following an undetected cartilage insult, warranting further investigation into the biological consequences of these injections. For equine practitioners, these findings indicate that single IA injections of these anaesthetics appear not to cause overt cartilage damage through catabolic pathways, though longer-term studies and multiple-injection protocols remain essential before drawing definitive conclusions about safety in clinical use.
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Practical Takeaways
- •Single IA injections of lidocaine or bupivacaine may have beneficial anabolic effects on cartilage rather than harmful ones, potentially supporting their use in joint therapy
- •These local anesthetics appear safe for intra-articular use in normal joints based on synovial fluid biomarker responses
- •Further research needed to confirm clinical relevance and determine optimal dosing protocols for therapeutic benefit
Key Findings
- •Single intra-articular injection of 2% lidocaine or 0.5% bupivacaine significantly increased cartilage matrix synthesis markers (CS846-aggrecan and CPII-type II collagen)
- •Bupivacaine induced unexpected decrease in collagen degradation markers (C2C and C1,2C)
- •Both local anesthetics demonstrated anabolic effects on cartilage metabolism in normal equine joints