Objective gait analysis methods for assessing movement asymmetry in the equine patient.

Abstract

OBJECTIVE: To demonstrate the uses, data interpretation, and limitations of objective gait analysis methods in equine practice. ANIMALS: Teaching and client-owned horses. METHODS: Informed owner consent was obtained for all animals used in the making of this technical tutorial video. Primary literature relevant to this video was reviewed from January 2016 to January 2026. Images and data were collected from teaching horses and client-owned horses. RESULTS: Objective gait analysis provides accurate and repeatable data on the locomotion of a horse; however, inaccuracies may occur, especially in cases of mild hind limb lameness and inaccurate sensor placement. CLINICAL RELEVANCE: Inertial measurement unit systems offer good repeatability across trials and function in differing environmental conditions. They provide objective assessment of changes in lameness after flexion tests and local analgesia. However, inertial measurement units require precise and time-consuming sensor placement, as well as establishment of a wireless connection. In contrast, camera-based systems have a faster setup, are less expensive, and are portable. They also allow owner-recorded videos to be uploaded for at-home analysis. Camera-based systems frequently require more trot-up and are more sensitive to suboptimal environmental conditions. The use of α-2 agonists during lameness evaluation can mask forelimb lameness but have limited effects on hind limb lameness. Tranquilizers generally do not interfere with gait analysis. In summary, objective gait analysis is a useful aid for clinicians in assessing mild or multilimb lameness and should be used in conjunction with subjective lameness evaluation.