Variability of the limb joint patterns of sound horses at trot.

The research examined the variability of limb joint angle patterns in physically sound horses trotting under conditions similar to a routine lameness examination. It found that the level of variability is low, and that the information could serve as reference data for evaluating abnormal gaits.

Objective of the Research

• The primary goal of this study was to evaluate the variability of the limb joint angle patterns in physically sound horses as they trot. This was done under conditions similar to those of a routine lameness examination.

Methodology

• The experiment involved 14 French Saddle horses whose kinematics were recorded using a 3-dimensional (3D) kinematic analysis system.
• The horses were allowed to spontaneously trot at constant speeds, with angle-time diagrams established and then evaluated for intra- and inter-individual variabilities over the entire stride.

Findings

• The study found that both intra- and inter-individual variabilities in limb joint angle patterns were low. However, these values varied across different joints and generally increased distally, with the highest values reached at the fetlock and coffin joints.
• The researchers observed that inter-individual variability was 0.9 to 1.9 times greater than intra-individual variability.
• A strong correlation was also found between the mean angle-time and the mean of individual diagrams set up for the entire population.

Conclusion

• The research concluded that similar tests could be reliably repeated with trotting horses in conditions similar to lameness examinations.
• It was further noted that in a homogeneous population, each horse adopts a constant angular pattern that closely resembles that of other horses.
• Given the noted high representation of each mean individual angle pattern in mean angle-time diagrams established on a sound population, these could be potentially used as reference data for further pathological gait analysis.