Use of a wireless, inertial sensor-based system to objectively evaluate flexion tests in the horse

Marshall, J.F., Lund, D.G. and Voute, L.C. (2012) Use of a wireless, inertial sensor-based system to objectively evaluate flexion tests in the horse. Equine Veterinary Journal, 44(s43), pp. 8-11. (doi:10.1111/j.2042-3306.2012.00611.x)

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Abstract

Objectives: A wireless, inertial sensor-based system has previously been validated for evaluation of equine lameness. However, threshold values have not been determined for the assessment of responses to flexion tests. The aim of this investigation was to evaluate a sensor-based system for objective assessment of the response to flexion.

Methods: Healthy adult horses (n = 17) in work were recruited prospectively. Horses were instrumented with sensors on the head (accelerometer), pelvis (accelerometer) and right forelimb (gyroscope), before trotting in a straight line (minimum 25 strides) for 2 consecutive trials. Sensors measured 1) vertical pelvic movement asymmetry (PMA) for both right and left hindlimb strides and 2) average difference in maximum and minimum pelvic height (PDMax and PDMin) between right and left hindlimb strides in millimetres. A hindlimb was randomly selected for proximal flexion (60 s), after which the horse trotted a minimum of 10 strides. Response to flexion was blindly assessed as negative or positive by an experienced observer. Changes in PMA, PDMax and PDMin between baseline and flexion examinations were calculated for each test. Statistical analysis consisted of a Pearson's product moment test and linear regression on baseline trials, Mann–Whitney rank sum test for effect of flexion and receiver operator curve (ROC) analysis of test parameters.

Results: There was a strong correlation between trials for PMA, PDMin and PDMax measurements (P<0.001). A positive flexion test resulted in a significant increase in PMA (P = 0.021) and PDMax (P = 0.05) only. Receiver–operator curve analysis established cut-off values for change in PMA and PDMax of 0.068 and 4.47 mm, respectively (sensitivity = 0.71, specificity = 0.65) to indicate a positive response to flexion.

Conclusions: A positive response to flexion resulted in significant changes to objective measurements of pelvic symmetry.

Potential relevance: Findings support the use of inertial sensor systems to objectively assess response to flexion tests. Further investigation is warranted to establish cut-off values for objective assessment of other diagnostic procedures.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Voute, Dr Lance and Marshall, Dr John
Authors: Marshall, J.F., Lund, D.G., and Voute, L.C.
College/School:College of Medical Veterinary and Life Sciences > School of Veterinary Medicine
Journal Name:Equine Veterinary Journal
Publisher:Blackwell Publishing
ISSN:0425-1644
ISSN (Online):2042-3306
Published Online:27 November 2012

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