Page 176 - Adams and Stashak's Lameness in Horses, 7th Edition

142 Chapter 2

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A C

B D

TM
Figure 2.130. The Q (hardware) with Lameness Locator® pastern in pouch. (C) Pelvic accelerometer attached with foam pad
(software) on standing horse. (A) Head accelerometer attached to and rubberized grip device. (D) Instrumented horse in motion.
head bumper. (B) Right forelimb gyroscope attached to dorsal
frequency (the expected vertical movement). 2,52 Outlier pelvis (for hindlimb lameness evaluation) position.
data is detected and discarded. Simple, experimentally Location of lameness to limb (or limbs) and timing of
determined reference range estimates between likeli­ peak lameness within the stride phase of a limb are
hood of “lameness” and “not lameness,” and the strength determined by the association of head and pelvic move­
(“weak,” “moderate,” and “strong”) of this evidence, ment to movement (angular velocity) of the right fore­
are presented to the veterinary user. Results are stand­ limb. All assessment of amplitude of lameness is
ardized to normal expected vertical movement (the generated by data from the head and pelvis sensors, and
periodic component of vertical movement at twice stride the right forelimb sensor is simply a stride event marker.
frequency) to accommodate for large differences in body Lameness evaluation results are reported in a graphi­
size or natural “boundingness” in trot. Lameness is cal display that depicts amplitude of impact and propul­
detected and quantified by reporting means and stand­ sion asymmetry in each stride. Lameness can be
ard deviations of maximum and minimum height differ­ evaluated with the horse trotting in a straight line, while
ences of the head (for forelimb lameness evaluation) and lunging (at the trot), and trotting under saddle. Response