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Acoustic Myography: Its Assessment of Ground Reaction Forces as Measured through Forelimb and Hind Limb of the Horse during Mild Exercise

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Open Journal of Veterinary Medicine 2022年第10期12卷 101-115页

作者： Diane Isbell Sebastian Laguna Jillian Costello Chavers Waqas Ahmed Vibeke Sødring Elbrønd Robert Bowker Adrian Harrison Equine Vet Practice Livermore USA University of La Salle Veterinary Sciences Bogota Colombia Magnolia Sport Horse Equine Lameness and Imaging PLLC Ocala USA Biomechanics & Rehabilitation Section for Pathobiological Sciences Dept for Veterinary and Animal Sciences (IVH) Faculty of Health & Medical Sciences University of Copenhagen Frederiksberg Denmark East Lansing MI & Corona Vista Equine Center Michigan State University East Lansing USA

Background: Fractures in the limbs of racehorses are common, resulting among other factors, as the result of repeated ground reaction forces on bones and joints, leading to catastrophic failure. Aim: To quantify ground impact transmission through the limb bones of un-shod healthy horses using the non-invasive technique of acoustic myography (AMG). Methods: Four sites were selected for AMG measurements at the walk and trot, hoof wall (site 1) and sites 2 - 4, metacarpal 3, carpals and the radius of the left forelimb of two healthy horses. Measurements were on both rubber and concrete. AMG of the equine hind limb suspensory system was made and analyzed (amplitude and timing) for the proximal suspensory ligament (PSL) and the SDFT/DDFT. Results: AMG signal amplitude at site 1 (1.5 ± 0.2 versus 1.1 ± 1.5) was not found to be significantly different at the trot compared to the walk;however, sites 2, 3 and 4 were all significantly different when compared between the two gaits;site 2 P = 0.008;site 3 P = 0.006;site 4 P = 0.005. AMG signals recorded on the rubber surface had smaller amplitude than the equivalent signal and site on the concrete surface. Ground Reaction Force (GRF) transmission in the equine forelimb was 22 m/sec, whilst that of the hind limb suspensory system was 25 m/sec. Conclusion: Findings indicate that GRFs are transmitted proximally along the limb at considerable speeds, that they are dampened by tissues and structures in the limb, and that the GRFs are present and detectable proximal to the fetlock joint.

关键词： Horse Foot Limb Acoustic Myography suspensory system

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