Page 188 - Adams and Stashak's Lameness in Horses, 7th Edition

154 Chapter 2

The Q® includes an optional Lameness Locator® the user must assign direction of movement as either
module that collects and evaluates data from an inertial “ride to left” or “ride to right.” Riding in one direction,
VetBooks.ir pouch. Additional stabilization of the sensor to prevent rect (outside) limb, or both, each for the desired dura­
the rider is asked to either sit the trot or post on the cor­
sensor attached to the rider at waist level in a belt with a
tion. The desired trial length most conveniently includes
independent wiggling, which creates motion noise, may be
necessary. The rider inertial sensor measures and assesses one full rotation around a large arena or multiple rota­
vertical and horizontal (backward and forward) accelera­ tions for riding in smaller circles. Strides collected with
tion of the rider when the horse is trotting. The data is the rider sitting the trot and strides collected with the
used in conjunction with that from the horse‐mounted rider posting on the correct limb are automatically
sensors to determine if the rider is sitting the trot, sitting detected and separated. Improper technique when sit­
the trot correctly, performing the rising trot (posting), and ting the trot with either asymmetrical (right vs. left
posting on the correct limb given the direction of motion strides) or asynchronous (to the horse’s vertical move­
selected for collection. The rider posting on the incorrect ment) vertical rider movement is flagged and will not be
limb given the direction of movement may exacerbate analyzed. Proper riding technique is verified, and the
lameness, but this is not currently evaluated. number of strides collected during each activity in one
Turning the rider sensor on initiates Lameness direction is displayed for analysis. Data collection for
Locator®’s software for under saddle collection and under‐saddle evaluation while riding in the other direc­
analysis. Four synchronous channels of data (horse tion is collected and analyzed in a separate trial. Riding
head, horse right forelimb, horse pelvis, and rider) are to the left and riding to the right are then compared for
collected. Because it is assumed that the horse will be each rider activity collected in a dual trial report similar
ridden in a circular path, and direction of movement to that for evaluating lunging in either direction
affects vertical head and pelvic movement asymmetry, (Figure 2.146).

Hindlimb Assessment
–30 30 Sit Trot –30 30
– Diff Max (mm) –20 + Diff Max (mm) 20 Stride Rate –0.1mm Diff Max Pelvis 0.7mm Stride Rate – Diff Max (mm) –20 + Diff Max (mm) 20 10
Mean
–10
10
–10
1.3
1.3
0 0 3.9mm SD 3.8mm 0 0
– Diff Min (mm) –10 + Diff Min (mm) 10 Strides Assessed 13.4mm Diff Min Pelvis 7.8mm Strides Assessed – Diff Min (mm) –10 + Diff Min (mm) 10 20
Mean
–20
–20
20
–30 30 66 3.9mm SD 3.7mm 86 –30 02040 60 80 30 02040 60 80
0
20 40 60
0
204060
Number of strides Number of strides Number of strides Number of strides
–30 30 Post Trot –30 30
– Diff Max (mm) –20 + Diff Max (mm) 20 Stride Rate –3.9mm Diff Max Pelvis 4.9mm Stride Rate – Diff Max (mm) –20 + Diff Max (mm) 20
Mean
10
–10
–10
10
0 0 1.4 3.4mm SD 3.0mm 1.4 0 0
– Diff Min (mm) –10 + Diff Min (mm) 10 Strides Assessed 8.7mm Diff Min Pelvis 5.5mm Strides Assessed – Diff Min (mm) –10 + Diff Min (mm) 10
–20
Mean
20
–20
20
–30 30 80 3.9mm SD 4.6 mm 68 –30 30
02040 60 80 02040 60 80 0204060 0 20 40 60
Hindlimb Assessment
–30 30 Sit Trot –30 30
– Diff Max (mm) –20 + Diff Max (mm) 20 Stride Rate 9.8mm Diff Max Pelvis 6.6mm Stride Rate – Diff Max (mm) –20 + Diff Max (mm) 20
Mean
10
–10
10
–10
0 0 1.2 5.1mm SD 4.5 mm 1.2 0 0
– Diff Min (mm) –10 + Diff Min (mm) 10 Strides Assessed –1.0mm Diff Min Pelvis 2.7mm Strides Assessed – Diff Min (mm) –10 + Diff Min (mm) 10
Mean
–20
20
20
–20
–30 30 71 64 –30 30
0204060 0 20 40 60 3.9mm SD 2.2mm 0 204060 0 20 40 60
Number of strides Number of strides Number of strides Number of strides
–30 30 Post Trot –30 30
– Diff Max (mm) –20 + Diff Max (mm) 20 Stride Rate 2.4mm Diff Max Pelvis 14.3mm Stride Rate – Diff Max (mm) –20 + Diff Max (mm) 20
Mean
–10
–10
10
10
0 0 1.3 4.2mm SD 3.9 mm 1.3 0 0
– Diff Min (mm) –10 + Diff Min (mm) 10 Strides Assessed –2.5mm Diff Min Pelvis 3.3mm Strides Assessed – Diff Min (mm) –10 + Diff Min (mm) 10
20
Mean
–20
–20
20
–30 30 67 71 –30 30
0 204060 0 20 40 60 2.9mm SD 2.3mm 0204060 0 20 40 60
Number of strides Number of strides Number of strides Number of strides
Figure 2.146. Lameness Locator® hindlimb lameness dual when riding to the left and posting on the right forelimb. Bottom report:
reports for ride to left versus ride to right. Results of sit trot are at top This horse has a right hindlimb pushoff lameness riding in both
of report and results of posting are at bottom of report. Top report: directions under both activities that is strongly affected by posting.
This horse has a right hindlimb impact lameness riding in both Note the decrease in right hindlimb pushoff lameness when riding to
directions under both activities that is unaffected by activity. However, the left (posting on the right forelimb) and the increase in right
note the artifactual production of a left hindlimb pushoff lameness hindlimb pushoff when riding to the right (posting on the left forelimb).