Risk of septic arthritis after intra-articular medication: a study of 16,624 injections in Thoroughbred racehorses.

The study discusses the risks and factors contributing to the development of septic arthritis in racehorses after receiving intra-articular medication. The study highlights the importance of aseptic procedures and also points to certain types of corticosteroids increasing the likelihood of septic arthritis.

Overview of Study

• The researchers aimed to evaluate the risk of septic arthritis following intra-articular medication in Thoroughbred racehorses, and identify any risk factors. The study had both a retrospective and prospective design combining prevalence study and a case-control study for risk factors.
• The study reviewed 16,624 injections administered to 1,103 horses through 6,695 visits to veterinarians. Arising from these, there were 13 instances where septic arthritis occurred as a complication.
• The relative risk of septic arthritis as determined by the number of cases to injections was 7.8 cases per 10,000 injections, or essentially 1 case per 1,279 injections.

Key Findings

• The study found that septic arthritis was an unusual complication but the risk in horses was significantly greater than that reported in humans.
• Among the identified risk factors, the type of corticosteroid used for intra-articular medication and the practicing veterinarian were consequential.

Implications and Future Research

• The researchers hypothesized that some veterinarians may have been less rigorous in following aseptic techniques, contributing to the greater risk of septic arthritis. However, this was beyond the scope of their study and remains a presumptive reason only.
• The type of corticosteroid used was identified as a risk factor but the study did not clarify whether some types posed a greater risk than others. Further research would be beneficial to identify if certain corticosteroids are more prone to result in septic arthritis after intra-articular medication.
• In conclusion, this research provides valuable insights about the risk of septic arthritis following intra-articular medication in racehorses, but more comprehensive studies are needed to examine additional risk factors.