Radiographic assessment of equine interphalangeal joints asymmetry: articular impact of asymmetric bearings (Part II).

This research seeks to establish a radiographic approach for capturing a horse’s individual hoof structure and assessing how it should be ideally trimmed. It examines how induced asymmetrical pressure on the hoof influences certain angle measurements on specific radiographs, revealing hoof deformation, phalanges rotation, and joint asymmetry.

Methodology

• The study was founded on a broader project to craft a radiographic technique that would accurately capture the unique formation of a horse’s hoof, providing key insights for optimal trimming.
• This exploration involved using detached horse limbs attached to a rotating support with differing inclinations designed to mimic variations and inconsistencies in the hoof’s weight-bearing surfaces.
• The researchers observed the response of these hooves to the induced asymmetric bearings, noting how they impacted the angles measured from certain radiographs.

Findings

• Three major responses were noted when the hoof reacted to asymmetric bearings:
• The hoof underwent a deformation, physically altering its shape and structure.
• Phalanges, the bones in the horse’s foot, showed rotation – indicating how the horse’s bones adapt to uneven pressure.
• A retrospective observation of joint asymmetry was indicated by localized narrowing of the articular space. This mainly occurred in the distal interphalangeal joint, which is the joint between the final two bone segments of the limb.
• The researchers inferred that some of the measured angles could allow for the quantification of this joint asymmetry, as well as angular deformities and rotational deviations present in a horse’s limbs.

Significance

• This study holds significant importance as it provides a scientific approach to understanding the horse’s hoof biomechanics, particularly in response to pressures from uneven weight distribution.
• The insights can potentially influence better hoof care procedures and strategies, like trimming, thus improving horse health and performance.