Quantifying center of pressure variability in chondrodystrophoid dogs.

TitleQuantifying center of pressure variability in chondrodystrophoid dogs.
Publication TypeJournal Article
Year of Publication2017
AuthorsBlau, S R., L M. Davis, A M. Gorney, C S. Dohse, K D. Williams, J-H Lim, W G. Pfitzner, E Laber, G S. Sawicki, and N J. Olby
JournalVet J
Date Published2017 Aug
KeywordsAnimals, Biomechanical Phenomena, Cartilage, Dog Diseases, Dogs, Gait, Species Specificity, Spinal Cord Injuries

The center of pressure (COP) position reflects a combination of proprioceptive, motor and mechanical function. As such, it can be used to quantify and characterize neurologic dysfunction. The aim of this study was to describe and quantify the movement of COP and its variability in healthy chondrodystrophoid dogs while walking to provide a baseline for comparison to dogs with spinal cord injury due to acute intervertebral disc herniations. Fifteen healthy adult chondrodystrophoid dogs were walked on an instrumented treadmill that recorded the location of each dog's COP as it walked. Center of pressure (COP) was referenced from an anatomical marker on the dogs' back. The root mean squared (RMS) values of changes in COP location in the sagittal (y) and horizontal (x) directions were calculated to determine the range of COP variability. Three dogs would not walk on the treadmill. One dog was too small to collect interpretable data. From the remaining 11 dogs, 206 trials were analyzed. Mean RMS for change in COPx per trial was 0.0138 (standard deviation, SD 0.0047) and for COPy was 0.0185 (SD 0.0071). Walking speed but not limb length had a significant effect on COP RMS. Repeat measurements in six dogs had high test retest consistency in the x and fair consistency in the y direction. In conclusion, COP variability can be measured consistently in dogs, and a range of COP variability for normal chondrodystrophoid dogs has been determined to provide a baseline for future studies on dogs with spinal cord injury.

Alternate JournalVet J
Original PublicationQuantifying center of pressure variability in chondrodystrophoid dogs.
PubMed ID28911837
PubMed Central IDPMC5675537
Grant ListP01 CA142538 / CA / NCI NIH HHS / United States
T35 OD011070 / OD / NIH HHS / United States