Radiographic and scintigraphic evaluation of the third carpal bone of control horses and horses with carpal lameness.

This study examines the third carpal bone in horses and its relationship with lameness, comparing findings from radiographic and scintigraphic examinations. The research reveals a correlation between the work discipline of the horse, increased opacity in the third carpal bone, and increased radiopharmaceutical uptake. Lameness related to the middle carpal joint was also found to be associated with these changes.

Objective:

The objective of this research was to compare radiographic and scintigraphic findings in the third carpal bone of horses that perform various work disciplines. The study also aimed to assess the relationship between abnormalities in the third carpal bone and the occurrence and cause of lameness in horses.

Method:

• Horses involved in the study underwent carpal radiography, specifically a dorsoproximal-dorsodistal oblique image of the carpal bones, and/or scintigraphic examination of the carpi.
• Information on the cause of lameness, breed, age, and work discipline of the horses were documented.
• Increased opacity in the third carpal bone was graded, while radiopharmaceutical uptake was calculated objectively and graded subjectively.
• The association between radiographic, scintigraphic, and clinical findings was statistically evaluated.

Findings:

• Both increased opacity in the third carpal bone and the ratio of radiopharmaceutical uptake were found to be associated with the work discipline (P = 0.003 and P = 0.015 respectively).
• Increase in opacity in the third carpal bone was correlated with both an increased grade of radiopharmaceutical uptake (P = 0.002) and ratio of radiopharmaceutical uptake (P = 0.013).
• Increased radiopharmaceutical uptake and increased opacity in the third carpal bone were not always observed together.
• Lameness specifically related to the middle carpal joint was linked with increased opacity (P < 0.001), an increased ratio of radiopharmaceutical uptake (P = 0.037), and increased radiopharmaceutical uptake grade (P < 0.001).

Conclusion:

Radiographic and scintigraphic abnormalities were discovered in horses participating in all types of disciplines. This suggests that high-speed exercise may not be the sole determinant in the development of bone disease in the third carpal. Both increased opacity and radiopharmaceutical uptake were more likely to be noted in horses with lameness tied to the middle carpal joint than in horses with pain originating from other sources.