Limits...
Effectiveness of slow motion video compared to real time video in improving the accuracy and consistency of subjective gait analysis in dogs.

Lane DM, Hill SA, Huntingford JL, Lafuente P, Wall R, Jones KA - Open Vet J (2015)

Bottom Line: Raters demonstrated no significant increase in consistency or accuracy in their SGA of slow motion video relative to real time video.Based on these findings, slow motion video does not increase the consistency or accuracy of SGA values.Further research is required to determine if slow motion video will benefit SGA in other ways.

View Article: PubMed Central - PubMed

Affiliation: Points East West Veterinary Services, Box 2696, Garibaldi Highlands, BC, VON 1T0, Canada.

ABSTRACT
Objective measures of canine gait quality via force plates, pressure mats or kinematic analysis are considered superior to subjective gait assessment (SGA). Despite research demonstrating that SGA does not accurately detect subtle lameness, it remains the most commonly performed diagnostic test for detecting lameness in dogs. This is largely because the financial, temporal and spatial requirements for existing objective gait analysis equipment makes this technology impractical for use in general practice. The utility of slow motion video as a potential tool to augment SGA is currently untested. To evaluate a more accessible way to overcome the limitations of SGA, a slow motion video study was undertaken. Three experienced veterinarians reviewed video footage of 30 dogs, 15 with a diagnosis of primary limb lameness based on history and physical examination, and 15 with no indication of limb lameness based on history and physical examination. Four different videos were made for each dog, demonstrating each dog walking and trotting in real time, and then again walking and trotting in 50% slow motion. For each video, the veterinary raters assessed both the degree of lameness, and which limb(s) they felt represented the source of the lameness. Spearman's rho, Cramer's V, and t-tests were performed to determine if slow motion video increased either the accuracy or consistency of raters' SGA relative to real time video. Raters demonstrated no significant increase in consistency or accuracy in their SGA of slow motion video relative to real time video. Based on these findings, slow motion video does not increase the consistency or accuracy of SGA values. Further research is required to determine if slow motion video will benefit SGA in other ways.

No MeSH data available.


Related in: MedlinePlus

Visual Analogue Scale completed by raters in this experiment to categorize the degree of lameness.
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Figure 1: Visual Analogue Scale completed by raters in this experiment to categorize the degree of lameness.

Mentions: A common method for reporting SGA is the use of a five point numerical rating scale (NRS) that divides the degree of lameness into categories (0= no lameness through 5=non-weight bearing lameness (Millis and Levine, 2014)). The NRS is a simple descriptive scale in which the examiners pick the level of lameness or the word that most describes the lameness they are viewing. More accurate than the NRS is the Visual Analogue Scale (VAS) depicted in Figure 1. In this instance, the observer places a mark somewhere along a 10cm line to indicate the degree of lameness, with anchor points similar to those of NRS at either end of the scale. The VAS scale can be analyzed as a continuous scale because, unlike the NRS which has a few specific categories, the VAS scale has numerous possibilities and can reflect even small changes in lameness.


Effectiveness of slow motion video compared to real time video in improving the accuracy and consistency of subjective gait analysis in dogs.

Lane DM, Hill SA, Huntingford JL, Lafuente P, Wall R, Jones KA - Open Vet J (2015)

Visual Analogue Scale completed by raters in this experiment to categorize the degree of lameness.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4663807&req=5

Figure 1: Visual Analogue Scale completed by raters in this experiment to categorize the degree of lameness.
Mentions: A common method for reporting SGA is the use of a five point numerical rating scale (NRS) that divides the degree of lameness into categories (0= no lameness through 5=non-weight bearing lameness (Millis and Levine, 2014)). The NRS is a simple descriptive scale in which the examiners pick the level of lameness or the word that most describes the lameness they are viewing. More accurate than the NRS is the Visual Analogue Scale (VAS) depicted in Figure 1. In this instance, the observer places a mark somewhere along a 10cm line to indicate the degree of lameness, with anchor points similar to those of NRS at either end of the scale. The VAS scale can be analyzed as a continuous scale because, unlike the NRS which has a few specific categories, the VAS scale has numerous possibilities and can reflect even small changes in lameness.

Bottom Line: Raters demonstrated no significant increase in consistency or accuracy in their SGA of slow motion video relative to real time video.Based on these findings, slow motion video does not increase the consistency or accuracy of SGA values.Further research is required to determine if slow motion video will benefit SGA in other ways.

View Article: PubMed Central - PubMed

Affiliation: Points East West Veterinary Services, Box 2696, Garibaldi Highlands, BC, VON 1T0, Canada.

ABSTRACT
Objective measures of canine gait quality via force plates, pressure mats or kinematic analysis are considered superior to subjective gait assessment (SGA). Despite research demonstrating that SGA does not accurately detect subtle lameness, it remains the most commonly performed diagnostic test for detecting lameness in dogs. This is largely because the financial, temporal and spatial requirements for existing objective gait analysis equipment makes this technology impractical for use in general practice. The utility of slow motion video as a potential tool to augment SGA is currently untested. To evaluate a more accessible way to overcome the limitations of SGA, a slow motion video study was undertaken. Three experienced veterinarians reviewed video footage of 30 dogs, 15 with a diagnosis of primary limb lameness based on history and physical examination, and 15 with no indication of limb lameness based on history and physical examination. Four different videos were made for each dog, demonstrating each dog walking and trotting in real time, and then again walking and trotting in 50% slow motion. For each video, the veterinary raters assessed both the degree of lameness, and which limb(s) they felt represented the source of the lameness. Spearman's rho, Cramer's V, and t-tests were performed to determine if slow motion video increased either the accuracy or consistency of raters' SGA relative to real time video. Raters demonstrated no significant increase in consistency or accuracy in their SGA of slow motion video relative to real time video. Based on these findings, slow motion video does not increase the consistency or accuracy of SGA values. Further research is required to determine if slow motion video will benefit SGA in other ways.

No MeSH data available.


Related in: MedlinePlus