Radiographic evolution of the forelimb digit in Ardenner horses from weaning to 28 months of age and its clinical significance.

The study analyzed how the growth and development of cartilage and bone in the digits (fingers) of 32 Ardenner horses changed over time, from when they were weaned to when they were around 28 months old. The aim was to understand any changes observed in radiographic images and their clinical implications.

Research Objective

• The research sought to follow the evolution of the forelimb digits in a group of 32 Ardenner horses from weaning to around 852 days old via radiographic imaging, and to understand the clinical significance of any changes observed.

Findings: Ossification of Collateral Cartilages

• The study found that on the early stages (250 days old), only 23% of the horses exhibited a small separate ossification center of collateral cartilages above the level of the distal sesamoid bone or at the level of the proximal half of the middle phalanx.
• By the time the horses reached around 852 days, all of them presented ossification of collateral cartilages, although this was at different stages and grades.
• The researchers also determined that the presence and extent of ossification of collateral cartilages did not significantly correlate with lameness in the horses.

Findings: Changes to Phalanges

• Changes to the phalanges appeared when the horses were around 1 year old. These changes were represented by entheseophytes (bone spurs) developing on the dorsal surface of the middle and distal phalanges.
• The incidence of horses affected by this condition increased with age as well as the size of the entheseophytes. This suggested that these changes might reflect the mechanical stresses applied to the interphalangeal joints.
• Significant association was observed between the presence of these phalanges changes and lameness in the horses.

Implications of the Study

• The findings could be significant in clinical evaluations to improve the selection of horses suitable for work and leisure activities.
• The presence and severity of changes to the phalanges, when combined with a clinical examination, might be an important consideration for determining a horse’s suitability for specific activities.