Clinical study evaluating the accuracy of injecting the distal tarsal joints in the horse.

The research involves a study to determine the accuracy of injecting joints in horses for the treatment of Osteoarthritis. It was discovered that the accuracy was 96% for the tarsometatarsal (TMT) joints and 42% for the centrodistal (CD) joints, indicating that CD joint injections are more challenging.

Objective and Methodology

• The aim of this research was to assess the precision of arthrocentesis, a medical procedure that helps in diagnosing and treating horses suffering from Osteoarthritis, mainly focusing on CD and TMT joints. This assessment involved a sample of equine surgeons and surgery residents.
• The methodology involved a randomized experimental study where six operators collectively injected CD and TMT joints in 12 different horses under sedation. The assignment of joints for injection (left CD/right TMT or right CD/left TMT) was random and spread across four horses.
• Each injection contained 4ml of a solution combining a contrast medium, sterile saline, and amikacin. Following the injection, at least two radiographs were taken from each joint to evaluate the spread of the contrast medium within the target joint.

Results and Conclusions

• The results showed a significant accuracy difference in injecting TMT and CD joints, 96% and 42% respectively. Also, communication between TMT and CD joints was visible in 26% of successful TMT injections and 20% of successful CD injections.
• It was also noted that the CD joint was often missed, leading to the placement of contrast medium in the periarticular tissues, instead of the target joint. This shows the intricacy of injecting the CD joint.
• Overall, the study concluded that achieving standardization in injection techniques among operators was challenging. The low injection accuracy of the CD joint suggests that practitioners may need to leverage additional methods like radiographs to ensure the accuracy of needle placement.