Abstract

Background: The angulation of the equine fetlock determines the load of associated tendons and probably their predisposition for injuries. However, it is questionable how the individual toe conformation and tendon properties interact with the dorsal DMPJ. Data are needed for a tangible evaluation of the equine limb conformation for more specific orthopaedic treatment.
Objectives: The aim was to evaluate the correlation between the dorsal metacarpophalangeal joint angle (DMPJ), toe conformation and cross-sectional area (CSA) of both flexor tendons (SDFT, DDFT).
Study Design: Descriptive, analytic in-vivo study to quantify the relation between factors.
Methods: 30 Warmblood horses were available for the study. Lateromedial radiographs of the toe and fetlock and transverse ultrasound images of both flexor tendons were obtained from three zones. The DMPJ, length and angle of the phalanges and CSA SDFT/DDFT were measured. In addition, hoof angle, wither height, age, and sex were documented. Correlations were calculated using Pearson’s test. A paired t-test was used to evaluate left–right differences.
Results: Length and angle of the proximal and middle phalanx were significantly associated with the DMPJ (r = -0.28 – -0.45, p

Key words: horse, fetlock, joint angle, toe conformation, flexor tendons, cross-sectional area