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Validation of two-dimensional kinematic analysis of walk and sit-to-stand motions in dogs

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  • 1 Comparative Orthopedics Laboratory, Department of Clinical Sciences, College of Veterinary Medicine, North Carolina State University, Raleigh, NC 27606
  • | 2 Center for Human Movement Science, University of North Carolina, Chapel Hill, NC 27599
  • | 3 Comparative Orthopedics Laboratory, Department of Clinical Sciences, College of Veterinary Medicine, North Carolina State University, Raleigh, NC 27606
  • | 4 Animal Rehabilitation and Wellness Hospital, 700-107 Blue Ridge Rd, Raleigh, NC 27606
  • | 5 Center for Human Movement Science, University of North Carolina, Chapel Hill, NC 27599
  • | 6 Center for Human Movement Science, University of North Carolina, Chapel Hill, NC 27599

Abstract

Objective—To assess the intra- and interobserver repeatability of 2-dimensional (2-D) kinematic analysis of walk and sit-to-stand motions in dogs.

Animals—10 healthy adult Labrador Retrievers.

Procedures—10 dogs were filmed during walk and sit-to-stand motions. Five trials were recorded for each dog, 3 of which were digitized. Two observers manually marked 15 landmarks on each frame during the motions of interest for these 3 trials. Each observer repeated the procedure approximately 1 week later. The 2-D joint angles were calculated. Intra- and interobserver coefficients of multiple correlations (CMCs) were calculated for each joint angle–time history.

Results—Intraobserver repeatability, assessed as the mean CMCs of 12 joint angle measurements made for 10 dogs by 2 observers, was good or excellent in 23 of 24 (96%) mean CMCs of the joints measured. Interobserver variation, assessed by comparing CMCs of measurements made by 2 observers on 10 dogs on 2 days, was good or excellent in 161 of 240 (67%) CMCs of joints measured.

Conclusions and Clinical Relevance—Intraobserver repeatability of 2-D kinematic measurements made on digitized videotapes was excellent. Interobserver repeatability of these measurements was acceptable.

Abstract

Objective—To assess the intra- and interobserver repeatability of 2-dimensional (2-D) kinematic analysis of walk and sit-to-stand motions in dogs.

Animals—10 healthy adult Labrador Retrievers.

Procedures—10 dogs were filmed during walk and sit-to-stand motions. Five trials were recorded for each dog, 3 of which were digitized. Two observers manually marked 15 landmarks on each frame during the motions of interest for these 3 trials. Each observer repeated the procedure approximately 1 week later. The 2-D joint angles were calculated. Intra- and interobserver coefficients of multiple correlations (CMCs) were calculated for each joint angle–time history.

Results—Intraobserver repeatability, assessed as the mean CMCs of 12 joint angle measurements made for 10 dogs by 2 observers, was good or excellent in 23 of 24 (96%) mean CMCs of the joints measured. Interobserver variation, assessed by comparing CMCs of measurements made by 2 observers on 10 dogs on 2 days, was good or excellent in 161 of 240 (67%) CMCs of joints measured.

Conclusions and Clinical Relevance—Intraobserver repeatability of 2-D kinematic measurements made on digitized videotapes was excellent. Interobserver repeatability of these measurements was acceptable.

Contributor Notes

Ms. Tate's present address is Appalachian Rehabilitation and Sports Medicine, Bristol, TN 37620.

Dr. Queen's present address is Michael W. Krzyzewski Human Performance Research Laboratory, Duke Sports Medicine Center, Duke University Medical Center, Durham, NC 27710.

The authors thank Sally E. Sasser for technical assistance.

Address correspondence to Dr. Marcellin-Little.