Morphologic radiographic study of the proximal sesamoid bones of the forelimb in thoroughbred racehorses in training.

This research paper revolves around studying the morphological changes or differences in the proximal sesamoid bones (PSB) of 2-year-old Thoroughbred racehorses during their training period.

Objective and Procedure

• The main objective of this study was to illustratively discover any variations in the shape (specifically the height and width) of the proximal sesamoid bones (PSBs) in young Thoroughbred racehorses throughout their training.
• The researchers captured dorsal 15° proximal-palmarodistal oblique images of each metacarpophalangeal joint before the start of the horses’ training as well as 1 year into their training.

Key Findings

• Throughout the study duration, the researchers observed that there were no significant changes in the height and width of the PSBs brought about by their training.
• However, meaningful differences in the dimensions of the PSBs were noticed when comparing medial and lateral PSBs. Specifically, in both arms, the medial PSBs were found to be statistically wider and shorter in comparison to the lateral PSBs.
• Furthermore, they discovered that among the right forelimb, the medial PSB was noticeably broader than its left counterpart.

Implications and Future Study

• The researchers indicate that these findings have the potential to explain some observed limb preferences for fractures of PSBs.
• Despite the important findings, the research still points towards the need for further study to understand the differences in the strain pattern between medial and lateral PSBs under various loading conditions.