Effect of video angle on detection of induced front limb lameness in horses.
Authors: Valle Alessandro P, Brown Kara A, Reilly Patrick, Ciamillo Sarah A, Davidson Elizabeth J, Stefanovski Darko, Stewart Holly L, Ortved Kyla F
Journal: BMC veterinary research
Summary
# Editorial Summary: Video Angle and Front Limb Lameness Detection Standardised video protocols for lameness assessment remain absent from equine practice despite widespread adoption of digital recording technology, creating inconsistency in diagnostic quality and clinical decision-making. Valle and colleagues conducted a randomised, blinded crossover study in which six horses were recorded at nine different angles—including head-on, trailing views, lateral perspectives offset from midline, and circular configurations—both with and without induced forelimb solar pain, with three expert equine veterinarians independently scoring lameness on a 0–5 scale whilst objective measurements were simultaneously captured using inertial sensor technology (Lameness Locator®). The study identified substantial variation in interobserver agreement and ease of grading across video angles, indicating that camera positioning significantly influences clinicians' ability to detect and quantify lameness consistently. These findings underscore the need for standardised video protocols in equine practice, particularly when recordings inform diagnosis, monitor treatment response, or support remote consultations—areas where poor-quality footage from suboptimal angles could mask genuine pathology or create false-positive assessments. Farriers, veterinarians, physiotherapists and coaches should advocate for consistent lateral recording at moderate trotting speeds as a baseline lameness assessment tool, complemented by alternative angles only when specific diagnostic questions require additional perspectives.
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Practical Takeaways
- •Video angle significantly impacts your ability to detect front limb lameness—standardizing recording technique is critical for consistent assessment and telemedicine consultations
- •Use this study's findings to determine which camera positions (frontal, lateral, or circular) provide the clearest lameness detection for your video recordings
- •Combining subjective video assessment with objective gait analysis tools improves diagnostic accuracy and reduces observer variability
Key Findings
- •Nine different video angles were evaluated for their utility in detecting mechanically induced front limb lameness in horses
- •Three expert equine veterinarians assessed lameness using subjective 0-5 point scoring system across all video angles
- •Study employed objective lameness measurement via inertial sensor system (Lameness Locator) as reference standard
- •Interobserver agreement and ease of grading were determined to establish optimal video angle for lameness assessment