Interpretation assistance is offered at the bottom of the report.

The strength of evidence reported is based on whether the TDH/VS, Diff Max pelvis or Diff Min pelvis is outside of the reference range for that measure and the stride to stride variability (SD). 

Indications of severity are based on a general range of amplitude of lameness, with levels increasing from “very mild”, “mild”, “mild/moderate”, “moderate”, and “moderate/severe”.  

The timing of the asymmetry is also noted in the AIDE. 

Law of Sides 

Ipsilateral suggests 1º hind limb lameness - THIS IS TRUE!!!!! WATCH OUT

• Compensatory FL can be of any type (impact, midstance, push off)

Contralateral suggests 1º forelimb lameness - This is partly true…  

Most Common

• Compensatory contralateral HL decreased push off 

Less Common

• Compensatory contralateral HL decreased push off and ipsilateral HL decreased impact
• Compensatory ipsilateral HL decreased impact (note: this pattern could also be indicative of primary hind)

the difference in maximum head height that occurs before RF weight bearing compared to before LF weight bearing. Ref range: -6.0 to +6.0 mm

• Measured in mm and reported as a mean value of all strides.
• Diff Max Head determines timing of asymmetry (depending on sign of Diff Min Head).
• Diff Max Head = Max height of head before RF weight bearing minus (-) max height of head before LF weight bearing. 

the difference in maximum pelvis height that occurs before RH weight bearing compared to before LH weight bearing. Ref range: -3.0 to +3.0 mm

• Measured in mm and reported as a mean value of all strides. 
• RH asymmetries are assigned (+) values. LH asymmetries are assigned (-) values.  Elevated Diff Max (either + or -) correlates to a push off lameness in the hind limb. 
• Diff Max Pelvis = Max height of pelvis before RH weight bearing minus (-) max height of pelvis before LH weight bearing.

the difference in minimum head height that occurs during RF mid stance compared to during LF mid stance. Ref range: -6.0 to +6.0 mm 

• Measured in mm and reported as a mean value of all strides. 
• Diff Min Head determines side of asymmetry (positive value = RF, negative value = LF). 
• Diff Min Head = Min height of head during RF mid-stance minus (-) min height of head during LF mid-stance.

the difference in minimum pelvis height that occurs during RH mid stance compared to during LH mid stance.Ref range: -3.0 to +3.0 mm

• Measured in mm and reported as a mean value of all strides. 
• RH asymmetries are assigned (+) values.  LH asymmetries are assigned (-) values.  Elevated Diff Min (either + or -) correlates to an impact lameness in the hind limb.
• Diff Min Pelvis = Min height of pelvis during RH mid-stance minus (-) min height of pelvis during LH mid-stance 

If the foot does not create a depression or a divot in the ground, the surface should be considered hard.  Hard preset surfaces = asphalt, concrete, packed dirt, gravel/stone, wood, frozen, treadmill, hard synthetic, hard (generic).

The head sensor device contains an accelerometer that tracks vertical head acceleration.

Indications of severity are based on a general range of amplitude of lameness, with levels increasing from “very mild”, “mild”, “mild/moderate”, “moderate”, and “moderate/severe”.

• “no” evidence: lameness measure is within reference range (see note**)
• “strong” evidence: Reported when the standard deviation is less than 50% of the mean Diff Min head (since Diff Min Head determines the side of forelimb lameness, it is the more important measure to assess for variability); or Mean Diff Min and/or Diff Max pelvis. 
• “moderate” evidence: Reported when the SD is between 50 and 120% of the mean.
• “weak” evidence: Reported when the standard deviation is greater than 120% of the mean.

**The veterinarian should keep in mind that the severities are a range, and should not be used to compare two trials for consistency of amplitude (such as in establishing a stable baseline between two trials) or to assess change in amplitude (such as before and after a block, or change over time).

quantitative data from the collected trial. Calculated lameness metrics include 1) mean values of Diff Max head, Diff Min head, Diff Max pelvis and Diff Min pelvis; 2) standard deviations for each respective mean Diff Max and Diff Min;  3) Total Diff Head (mean vector sum) of the forelimb data; and 4) The Q Score for both forelimb and hind limb data.