The Effect of Perineural Anesthesia and Handler Position on Limb Loading and Hoof Balance of the Vertical Ground Reaction Force in Sound Horses
Authors: Van de Water E, Oosterlinck M, Willekens S, Pille F
Journal: Equine Veterinary Journal
Summary
# Editorial Summary Pressure plate analysis is increasingly used to quantify limb loading and hoof balance in lame horses, but interpreting the findings requires understanding how normal variations in the examination procedure might influence results. Van de Water and colleagues investigated whether handler position (left versus right side) or perineural nerve blocks (palmar digital and abaxial sesamoid) affected vertical ground reaction forces in six sound Warmblood horses during walk and trot, measuring peak vertical force, vertical impulse, stance time, and hoof balance distribution patterns across 126 measurements per horse. Neither handler position nor anesthesia produced clinically meaningful changes in limb loading symmetry or the toe-heel and medio-lateral load distribution curves, with hoof balance patterns proving highly repeatable within individual horses despite the procedural variations tested. This consistency in sound horses strengthens the diagnostic validity of pressure plate analysis, suggesting that significant departures from an individual's baseline loading patterns or asymmetries between limbs are likely genuine indicators of pain or dysfunction rather than artefacts of examination technique. Practitioners can therefore be confident that notable abnormalities identified through pressure plate analysis represent meaningful pathology, making this objective measurement tool more reliable for lameness investigation and monitoring therapeutic interventions.
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Practical Takeaways
- •Handler position during pressure plate analysis does not need to be standardized for sound horses, reducing methodological constraints during lameness evaluation
- •Pressure plate findings showing asymmetry or abnormal hoof loading patterns can be confidently attributed to pathology rather than measurement error, supporting its use in lameness diagnosis
- •The high repeatability of hoof balance curves means subtle changes over time or between limbs detected by pressure plate are clinically meaningful
Key Findings
- •Handler position had no significant effect on peak vertical force, vertical impulse, or hoof balance curves in sound horses
- •Perineural anesthesia (palmar digital and abaxial sesamoid nerve blocks) did not significantly affect limb loading parameters or hoof balance at trot
- •Hoof balance curves were highly repeatable within individual horses, suggesting pressure plate analysis can reliably detect abnormalities in lame horses
- •Significant aberrations in pressure plate measurements in lame horses are likely related to true pathology rather than methodological artifacts