Methods and Variables Associated with the Risk of Septic Arthritis Following Intra-Articular Injections in Horses: A Survey of Veterinarians.
Authors: Gillespie Caroline C, Adams Stephen B, Moore George E
Journal: Veterinary surgery : VS
Summary
# Editorial Summary Gillespie et al.'s 2016 survey of 241 equine veterinarians examined injection techniques and infection risk following intra-articular procedures, analysing 319,760 joint injections from medical records (64 practitioners provided data) to identify variables associated with septic arthritis. The overall incidence of septic arthritis was reassuringly low at 2.10 cases per 10,000 injections; however, the multivariate analysis revealed several technique-dependent risk factors that merit attention. Site preparation by the injecting veterinarian themselves significantly reduced infection risk (OR=0.10), whilst counterintuitively, clipping hair at the injection site substantially increased risk (OR=19.70)—possibly reflecting contamination during clipping or hair particle introduction into the joint. Less experienced practitioners with fewer than 20 years' experience showed lower infection rates (OR=0.025), suggesting that technique standardisation and adherence to protocol may offer greater protection than years in practice. Eight different injection methods were commonly employed across respondents, indicating considerable variability in clinical practice; given the demonstrable safety of intra-articular therapy overall, this variation may reflect successful adaptation to individual circumstances, though the specific superiority of any single technique remains unclear. For practitioners, these findings reinforce the importance of meticulous asepsis, careful site preparation without clipping, and consistency in technique—elements that appear more protective than cumulative experience alone.
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Practical Takeaways
- •Do not clip or remove hair at intra-articular injection sites—this substantially increases septic arthritis risk; prepare the site without hair removal
- •Prepare your own injection materials and solutions rather than pre-made alternatives to reduce infection risk
- •Overall septic arthritis risk is low with current methods, but technique matters—follow consistent aseptic protocols
Key Findings
- •Incidence of septic arthritis was 2.10 per 10,000 intra-articular injections (67/319,760 joints) across surveyed practices
- •Veterinarians preparing their own injection sites had 90% lower infection risk (OR=0.10)
- •Hair removal at injection site increased infection risk 19.7-fold (OR=19.70)
- •Practitioners with <20 years experience had significantly lower infection rates (OR=0.025)