Factors associated with prognosis for survival and athletic use in foals with septic arthritis: 93 cases (1987-1994).

This research studied factors affecting the survival and future athletic use in foals (young horses) diagnosed with septic arthritis. While it was found that the survival rate was generally favorable with treatment, the prognosis for the foals’ future ability to participate in races was typically unfavorable.

Objective and Methodology

• The aim of the study was to understand what factors influence the progress of survival and potential for athletic use in foals suffering from septic arthritis, i.e., bacterial infection in the joints.
• The investigation involved a retrospective study of 93 foals diagnosed with septic arthritis.
• The research team reviewed medical records to gather clinical findings, laboratory test results, radiographic findings, treatment strategies, and outcomes.
• Race records, where available, were examined for Thoroughbreds and Standardbreds to ascertain if any of the foals ever participated in races and, if they did, how successful they were.

Key Findings

• The study showed that both single and multiple joints could be affected by septic arthritis, with the femoropatellar and tarsocrural joints being most commonly affected.
• Related complications such as osteomyelitis (a type of bone infection) or degenerative joint disease were detected in 59% of the foals.
• Other common health issues among the study group included failure of passive transfer (inability to acquire immunity from the mother via colostrum), pneumonia, and enteritis (inflammation of the intestine).
• Most foals were treated with a combination of joint lavage (cleanse), intra-articular administration of antibiotics, arthroscopic debridement (removal of damaged tissue) with or without partial synovectomy (removal of part of the joint lining), or infected bone debridement accompanied by systemic antibiotics.

Outcome and Conclusions

• Of the 93 foals in the study, 73 survived to be discharged from the hospital, and approximately a third went on to participate in races post recovery.
• The isolation of bacteria Salmonella spp from synovial fluid (the lubricating fluid in the joints) and the presence of multisystem disease were associated with an unfavorable prognosis for survival and the ability to race.
• However, factors such as the number of affected joints and the neutrophil count in the synovial fluid at admission were not significantly associated with survival and the ability to race.
• Based on these findings, the study concluded that while treatment significantly improved the survival rate of foals with septic arthritis, their prognosis for a racing career was generally unfavorable.