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Now Available: Lameness Locator® 20/20

By Equinosis Logo Equinosis Staff | Updated on | Equinosis Staff, Racing, Standardbred Racing, Thoroughbred Racing, trackside selection


Now Available: Lameness Locator® 20/20

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Active OES Members receive free software upgrades. Fill out the Upgrade Request Form to request an upgrade your system or to see if you are eligible.

Settings

Lameness Locator has several configurable settings, including allowing manual stride selection, turning off the AIDE statements, addition of veterinarians to display on the report, report output format (PDF vs JPEG), report output location and more. View all configurable options under Settings from the main menu. The following configurable options have been added in LL 20/20.

Surface Selection Configuration

Figure 1 - Surface selection configuration.

Streamline your drop-down menu of surface options for easier viewing and selection. Go to Settings in the main menu. Click into the General tab. Here you will see surface configuration. Unselect any surfaces you wish to hide from your drop-down menu (figure 1). Surfaces can always be re-configured as desired.

Theme

Figure 2 - Theme.

A colored theme user interface is now available (figure 2). Coordinate to your practice colors or select different themes that may be more outdoor friendly in bright sunlight. You can also alternate between light and dark mode. 

Data Export

For those conducting research, the data export into CSV is a great tool, allowing the user to export all trial data from selected horses into a spreadsheet. This function has been enhanced with easy click to add horse selection buttons, as well as the ability to further streamline the export, such as only including the most recent analysis of a particular trial, or the option to include the auto-generated 8 stride baseline that previously was shown for every straight-line trial. 

Patient Management

Volume Tracking

Number of owners and horses are now displayed at the bottom of scrolling menu, for easy tracking of patient volume.

Moving trials to another horse

Individual trials that may have been collected under the wrong horse can more easily be moved to the correct horse if desired.

Combining Horses

When a horse is accidentally entered more than once, you can combine these horses to easily move all trials at once. Or, if ownership of a horse is transferred, a new owner and horse can be created, and the horse’s trial history can be combined with this horse under its new owner.

Combining Owners

If an owner is accidentally entered more than once, owners can be combined, and all horses merged.

Data Collection

Diagnostic Blocking Selection 

Figure 3 – Diagnostic blocking selection.

Selection is improved with larger color enhanced + buttons versus check boxes and easier scrolling (figure 3).

Blocking Addition

Dorsal branch of the lateral plantar nerve (DBLPN) has been added to the hind limb perineural block options.

Analyze for Pace

Figure 4 – Analyze for pace.

Lameness Locator algorithms are based on the trotting horse. Using the RF gyro, the inference of which hind limb is on the ground is relative to stance of the right forelimb at the trot. Therefore, historically, pacing horses would measure with opposite of true hind limb results because the inference of which hind limb is on the ground is incorrect. A RH lameness would measure as LH and vice versa. In LL 20/20, when setting up a trial, you can select “assume pacing strides” in the trial set up (figure 4). This will stimulate the analysis to flip the sign of Diff Max and Diff Min Pelvis so that hind limb lameness is reported correctly.

New Paintbrush Manual Stride Selection

This feature will most commonly be used with the new track side pelvic sensor to select straight line strides from turning strides in the manual stride selection window (See Track side Pelvic Sensor).  However, this can also be used under special circumstances where more specific selection of strides is desired, perhaps based on time points rather than based on a percentage around the median stride rate, which is the default method. When using the manual stride selection functionality (enabled in settings), the user has the ability to view the RF angular velocity plot and either accept the default selection, use the slider bar to increase or decrease the selection based on a percentage around the median stride rate (as previous), or adjust the selection using the paintbrush and eraser buttons. It is important to note that using the paintbrush function overrides the default stride selection based on a window around the median stride rate.

Selecting strides based on time points versus those that fall within a window around the median stride rate may result in the inclusion of strides that are more variable based on speed of the horse. This may, in turn, increase the stride-to-stride variability of lameness. It is therefore important to take into consideration what the horse is doing throughout the collection.  Take care to not include walking strides, which are normally filtered out of the default stride selection. Walking strides can be differentiated from trotting strides based by viewing the angular velocity signal. There will be more strides per second at the trot, meaning more peaks based on the given time interval (figure 5).

Figure 5 – New manual stride selection.

  1. To use the paintbrush feature, click the paintbrush icon in the upper left corner of the stride selection window. With the paintbrush enabled, use your finger or the stylus and drag to increase the selection anywhere on the plot.
  2. Click on the eraser icon to enable the erase function. Use the erase function to decrease the default selection in the same manner.
  3. To restore the original default selection, select the home

Track side Sensor and Stride Selection of Straight Versus Turns

Figure 6 – Trackside sensor and stride selection of straight vs. turns.

New pelvic sensor functionality* taps into the ability to collect directional compass data, allowing for the selection of straight versus turning strides using the manual stride selection and the paintbrush.

This feature will allow veterinarians evaluating harness horses on the track to select straightaways from turns if desired.

To alter the stride selection based on straight lines versus turns, enable the manual stride selection in settings.

Upon presentation of the stride selection during the analysis, change the signal displayed from the default RF angular velocity to Magnetic Compass X/Y in the upper right corner drop down menu (figure 6).

*new track side pelvic sensor required

Figure 7 – Stride selection.

Enable the eraser to clear the default selection. Enable the paintbrush to make a new selection. Use the blue signal to determine straight-away (flat sections) from curves (sloped sections).  When satisfied, select 'Continue' (figure 7).

Improved Posting Detection in Rider Module

Posting detection was previously obtained using only the vertical acceleration signal of the rider. Failure to detect posting strides was occasionally experienced when the rider did not post distinctly. The algorithm has been modified to use both vertical and horizontal acceleration for more sensitive detection of when the rider is posting.

Data Interpretation

Comparison Reports

The Recheck Comparison Report can now be used for straight line trials collected on the same day. This is useful for comparing trials before and after some therapeutic intervention, such as a shoeing change, chiropractic adjustment or other, where more immediate feedback is desired.

This report can also be used for comparing two baselines for stability.  While the intent of the recheck comparison report is to compare two trials over time for improvement (and provides a percent calculation of improvement in lameness measured between time 1 and time 2), the veterinarian can also consider the lack of change, which would be an indication that the two back-to-back trial measurements are stable.

LL Intel

The results of a large study, Comparison of results for body-mounted inertial sensor assessment with final lameness determination in 1224 equids (Reed, et al.), conducted at the University of Missouri and published in JAVMA March 2019, have been incorporated into LL 20/20 as a clinical aid to the veterinarian. This study consisted of medical record review of 1,224 horses that presented to the University of Missouri for poor performance or lameness between 2011 and 2017. Information collected included whether or not a final diagnosis could be obtained and, if a final diagnosis was obtained, whether the cause was determined to be in the forelimb(s) only, in the hindlimb(s) only, simultaneously in the forelimb(s) and hindlimb(s), not in the limbs (i.e. neurologic, axial skeletal, or some other cause), or that the horse was normal. The study then associated initial measurement of lameness in the straight-line evaluation with final determination of the site of primary lameness after full workup. The clinician can open the LL Intel on a particular straight-line trial to see the statistical outcomes of horses that measured with the same lameness distribution pattern. 

LL Intel differs from the LL AIDE statements for the straight-line reports in that the AIDE statements offer a limb-by-limb assessment of the degree of evidence for lameness in each limb (which is an indication of the stride-to-stride variation or consistency of the measurement) and the timing and relative amplitude of lameness in each limb. If a multiple limb lameness is measured, algorithms evaluate for known compensatory lameness patterns. The suggestion of a primary limb may be offered if a known compensatory lameness pattern is identified. This suggestion, however, is also based on the amplitudes of lameness in each limb as well as the stride-to-stride variation of each lameness measured. In other words, a compensatory pattern may exist, but if the data is highly variable, or the relationship of the amplitudes is out of line, the algorithm may suggest insufficient evidence of a primary limb.

The LL Intel, on the other hand, is based only on the distribution of lameness in the limbs (which may include no lameness, single limb or multiple limb lameness), as well as the timing of hind limb lameness, and comparing that pattern of asymmetry to the localization outcomes of horses with a similar pattern of asymmetry. It does not consider the amplitude or variability which may, of course, affect outcomes.  So, it is important to bear in mind the relative amplitudes and variability of each lameness measured when making clinical judgments on which limb may be the primary lameness in a multiple limb lameness presentation.

Figure 8 – LL Intel.

To access LL Intel (figure 8):

  1. Go to the Review tab.
  2. Single click on a straight-line trial (without blocks or flexions).
  3. In the right-hand pane, you will see the AIDE statement for that trial.
  4. Just above this you will see a lightbulb. Click on the light bulb to open the LL Intel window.

The LL Intel will describe the number of horses that presented with this distribution pattern (note some patterns had few numbers of horses which can affect statistical significance), the percent of those horses that a definitive diagnosis was achieved, and the percentages of where the lameness localized.

Introducing Equinosis Cloud Services

LL 20/20 will launch Equinosis’ first cloud-based services.  Although the initial services will be limited, the future will bring many exciting new features enabled by resources residing on the internet.  Out of the gate, LL 20/20 will allow the storage and backup of your Lameness Locator data in the cloud.  For a multi-system practice, data can be shared across the organization.  

Before year end, additional functionality will follow to enable, among other things, sharing individual horses/trials outside of an organization (e.g., sharing data with a referral clinic) and adding a “desktop app” to access data from a non-Lameness Locator computer. 



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