Novel computed tomographic analysis demonstrates differences in patterns of bone mineral content between fracture configurations in distal condylar fractures of the third metacarpal/metatarsal bones in 97 Thoroughbred racehorses.

This study applied novel computed tomographic (CT) image analysis to identify varying patterns of bone mineral content in different types of fractures in horses’ third metacarpal and metatarsal condyle bones. This new method could potentially help predict fracture risk in equine athletes.

Research Methodology

• The research subjects were 97 Thoroughbred racehorses that had fractures in their third metacarpal/metatarsal condyle bones.
• Using computerized tomography (CT) images of these fractures, the researchers evaluated the bone mineral content patterns.
• Fractures were categorized based on their radiographic appearances.
• Through image analysis, they measured the area of highly attenuating pixels (aHAP), the areal density of highly attenuating pixels (dHAP) using novel convex hull analysis, and the subjective assessment of apparent attenuation intensity ranking (AAIR) for each fracture.
• Subsequently, they compared these metrics between the different fracture configuration groups.

Research Findings

• The analysis found that fractures that were propagating exhibited lower-density regions of highly attenuating pixels compared to unicortical fractures which displayed higher density regions.
• No differential in dHAP was noted between complete and incomplete fracture configurations.
• Interestingly, the ratio of dHAP between fractured and unfractured condyles varied. This ratio showed greater density differences between condyles in unicortical and incomplete fractures compared to propagating fractures.

Conclusion and Implications

• The study established that different types of fractures, specifically propagating, bicortical (complete and incomplete), and unicortical fractures, in the third metacarpal/metatarsal bone condyles had distinctive patterns of bone mineral content.
• The new method of using computer-assisted geometric measurement of dHAP shown on CT images could help predict fracture risk in horses. This approach is particularly relevant as standing CT screening becomes more accessible and available in equine veterinary practice.