Page 187 - Adams and Stashak's Lameness in Horses, 7th Edition

Examination for Lameness 153

Default Analysis Settings Default
1.4
1.4
Stride Rate
VetBooks.ir 60 Forelimb Assessment 60
40 RF pushoff RF impact 40 RF pushoff RF impact
Diff Max Head
20 –11.6 mm Mean 12.8 mm 20
Diff Min (mm) 0 Diff Min Head Diff Min (mm) 0
SD
10.1 mm
13.6 mm
–20 –8.9 mm Mean 20.5 mm –20
9.0 mm SD 12.7 mm
–40 Total Diff Head (Vector Sum) –40
LF impact LF pushoff LF impact LF pushoff
14.6 mm 24.2 mm
–60 Strides Assessed –60
–60 –40 –20 0 20 40 60 –60 –40 –20 0 20 40 60
Diff Max (mm) 68 51 Diff Max (mm)
Hindlimb Assessment
–30 LH pushoff 30 RH pushoff –30 LH pushoff 30 RH pushoff
– Diff Max (mm) –20 + Diff Max (mm) 20 Diff Max Pelvis – Diff Max (mm) –20 + Diff Max (mm) 20

–10
10
10
–10
–10.4 mm
6.0 mm
SD:
5.4 mm Mean: 10.8 mm
0 0 Diff Min Pelvis 0 0
– Diff Min (mm) –10 LH impact + Diff Min (mm) 20 RH impact –14.8 mm Mean: 12.1 mm – Diff Min (mm) –10 LH impact + Diff Min (mm) 20 RH impact
10
10
5.7 mm
SD:
5.7 mm
–20
–20
Strides Assessed
–30 30 –30 30
0 20 40 60 0 20 40 60 68 74 0 20 40 60 0 20 40 60
Number of Strides Number of Strides Number of Strides Number of Strides
Figure 2.145. Lameness Locator® report of a normal horse lunging on a hard (asphalt) surface. Inside forelimb impact and inside
hindlimb impact and pushoff lameness are measured.
Measuring Bilateral Lameness Evaluation of Lameness Under Saddle
No method that uses asymmetry as the measure of The Q® can be used to evaluate lameness under saddle
lameness can detect a perfectly bilateral lameness, and with or without instrumentation of the rider with a sepa­
no measurement method that does not have a reason­ rate inertial sensor. If used with the rider sensor, rider
able absolute known normal for the particular activity is detected, monitored, and assessed, and lame­
measurement for the individual horse can detect the ness is interpreted in light of this activity. If used under
existence of a perfectly bilateral pathological condi­ saddle without the rider sensor, rider activity should be
tion. However, most bilateral conditions that cause known and noted by the evaluator so that any expected
12
lameness will have one side that is more affected than effects on lameness measurement can be properly inter­
the other so that some lameness can be measured. preted. Rider activity affects lameness measurement
Therefore, a bilateral lameness measured in a horse under saddle. 39,62,63 Because there is no need for a handler
traveling in straight line will be an underestimation of to run back and forth multiple times leading the horse
the amplitude of true lameness. “Lateralization” of the overground, assessment under saddle facilitates collec­
lameness by measuring while lunging in both directions tion of data from multiple contiguous strides over longer
and then comparing both directional trial results can periods of time (several minutes) compared to in‐hand
assist in estimating the true amplitude of lameness in straight‐line evaluation. Also, many horses behave better
both limbs, but until the pain in one limb is totally with less variable movement when under saddle. The col­
eliminated with blocking can the total lameness in one lection of larger numbers of contiguous strides with lower
limb be determined. This fact should be realized when stride‐by‐stride variability aids in detecting mild lameness
assessing treatments in studies using subjects with or finding small changes in lameness severity. In most
bilateral pathological conditions. In quadrupeds, the assessment, environments (arena and round pens) collect­
state of the two limbs in the other half of the body ing unbroken under‐saddle data for several minutes
must also be determined. assumes that the horse will be ridden in a circular path.