The aim of this work was the development of software to examine the motion-cycle and kinematic lameness parameters of horses and to show that this software helps in the analysis of kinematic data.
The software was tested on the kinematic data of 12 horses with induced lameness. Lameness was induced by applying pressure to the sole with a special horse-shoe developed by MERKENS & SCHAMHARDT (1988). Data of at least 10 motion cycles for each of three induced lameness grades (0, 1/4, and 2/4), on a score by STASHAK (2008), were collected for each horse while trotting on a treadmill (Mustang 2200, Kagra AG, Fahrwangen, Switzerland). The movement was recorded with a 6 camera system (Sampling rate: 120 Hz, Resolution: 240x480) from "Motion Analysis®" (http://www.motionanalysis.com). The software routines were written in "MATLAB®" (Version R2008b) and can be found in the appendix of this work.
Lameness was documented as percentage of asymmetry of vertical head and os scarum movement. Each stride was divided in a modified cranial and a modified caudal phase defined by the crossover point between the moving and the standing extremity. The modified caudal phase of one extremity equals the modified cranial phase of the opposite extremity and vice versa. The total mean stride length and duration as well as the mean difference between the modified cranial and modified caudal stride phase length and duration were compared between the three lameness grades.
The software was developed successfully and tested with the following results.
With increased lameness the asymmetry increased significantly (P < 0,01) from 18,701% to 33,086%. Stride length also decreased significantly (P < 0.05) from 2,654m to 2,587m and the stride duration decreased significantly (P < 0.05) from 0,692s to 0,678s as well. No significant change was measured in the difference between the modified cranial and modified caudal stride phase length and duration. Further investigations with more and clinical cases are recommended to see if different results are archived.
It was shown that the developed software can be used to examine the motion-cycle and kinematic lameness parameters of horses and that it saves in the analysis of kinematic data.
Publication(s) resulting from University thesis:
Schwanda, M; Peham, C
(2013): Changes in stride parameters caused by induced supporting limb lameness in trotting horses on a treadmill.
Wien Tierarztl Monat (100), 7-8 181-187.