Radiographic assessment of equine interphalangeal joints asymmetry: articular impact of phalangeal rotations (Part I).

The research provides a method to objectively assess the conformation of a horse’s digit (a part of the foot) and the impact of its rotation, through specific radiographic measurements.

Objectives of the Study

• The primary goal of the study was to develop an objective radiographic method to assess the individual conformation of an equine digit and its appropriate trimming.
• The authors aimed to explore the impact of induced foot rotations on several angles measured from specific radiographs.

Methods and Materials

• The researchers used isolated distal limbs positioned on a rotation support to carry out their studies.
• They studied the influence of controlled foot rotations on the measurement of several angles from specific radiographic images.

Findings and Observations

• The study’s results enabled the authors to accurately quantify the rotation of the proximal phalanx (the bone in the foot of a horse) compared to the distal phalanx (the bone at the end of the foot, inside the hoof).
• They could also determine the extent of possible rotation in the distal interphalangeal joint, which is the joint between the distal and middle phalanx.
• According to the observations, when the foot was forcefully rotated, the digit responded by transforming the shape of the hoof (known as hoof plastic deformity).
• Moreover, the study reported distal interphalangeal intra-articular rotation (rotation inside the joint) and asymmetrical interphalangeal compressions (uneven compression between the bones in the digit).

Significance of the Study

• The study provides objective methods to measure and assess the rotation impacts on the interphalangeal joints in equine digits.
• This objective assessment, through radiographic measurements, may help in developing better care, treatment, and management strategies for horses’ hoof health and overall locomotion.