Fragmentation of the proximal tubercle of the talus in horses: 9 cases (2004-2010).

This study explored the incidence of a specific type of bone fragment condition in horses, known as fragmentation of the proximal tubercle of the talus. The researchers aimed to identify the anatomical features of the affected area, as well as the diagnosis methods, treatment, and prognosis. The study found that this condition often occurs in warmblood horses and does not usually cause lameness, and the affected horses remained stable over the study period.

Study Methodology

• The analysis was retrospective, looking back on a series of 9 documented cases of fragmentation of the proximal tubercle of the talus (FPTT) from June 2004 to December 2010.
• The research involved a thorough review of 2,543 radiographic views of the tarsal region of 1,526 horses that were checked over this period.
• For all horses where FPTT was detected, their medical records were sourced. The researchers then recorded each horse’s characteristics, medical history, signs of the condition, diagnostic methods used, treatment given, and their health outcomes.

Study Results

• The researchers identified FPTT in 9 of the examined horses. These horses were mostly warmbloods, and their ages ranged between 1 and 12 years, with a median age of 5 years.
• Diagnosis was usually based on radiographic images, and in some cases, supported by ultrasonography and CT scan results.
• Only one of the affected horses experienced lameness, and this horse had a history of trauma resulting in a lateral tibial malleolus fracture.
• Referring to the treatment outcomes, one horse underwent arthroscopy, though no fragments were discovered and presumed to be extra-articular (outside the joint).
• Of the 9 horses, outcome data was available for 7. A follow-up over a period of 1 to 4 years suggested their conditions remained radiographically and clinically stable.

Study Conclusions

• Based on the study findings, fragmentation of the proximal tubercle of the talus appears more common in warmblood horse breeds, though it does not typically cause lameness.
• The affected horses continue to be clinically and radiographically stable over time, suggesting FPTT may not have severe or deteriorating implications for the horse’s health or performance.
• The study’s results are instrumental for veterinary practitioners conducting radiographic screenings during pre-purchase examinations, providing insight into the implications and prognosis of FPTT in horses.