Erika Fernanda V. Garcia(1), Catherine A. Loughin(1,*), Dominic J. Marino(1), Joseph Sackman(1), Scott E. Umbaugh(2), Jiyuan Fu(2), Samrut Subedi(2), Martin L. Lesser3,
Meredith Akerman(3) and João Eduardo W. Schossler(4)
1 Department of Surgery, Long Island Veterinary Specialists, 163 South Service Road, Plainview, NY 11803, USA
2 Computer Vision and Image Processing Laboratory, Electrical and Computer Engineering Department, Southern Illinois University at Edwardsville, Edwardsville, IL 62026-1801, USA
3 North Shore - LIJ Health System Feinstein Institute for Medical Research, Biostatistics Unit, Manhasset, NY 11030, USA
4 Universidade Federal de Santa Maria, Santa Maria, Brazil
Subtle lameness makes it difficult to ascertain which is the affected limb. A study was conducted to investigate a change in the thermal pattern and temperature of the thermal image of the paw print in a lame pelvic limb compared to a non-lame pelvic limb of dogs confirmed by orthostatic analysis. Fourteen client owned dogs with a unilateral pelvic limb lameness and 14 healthy employee dogs were examined and the pelvic limbs radiographed. Thermal images of the paw print were taken after each dog was kept in a static position on a foam mat for 30 seconds. Average temperatures and thermographic patterns were analyzed. Analysis was performed in a static position. The asymmetry index for each stance variable and optimal cutoff point for the peak vertical force and thermal image temperatures were calculated. Image pattern analysis revealed 88% success in differentiating the lame group, and 100% in identifying the same thermal pattern in the healthy group. The mean of the peak vertical force revealed a 10.0% difference between the left and right pelvic limb in healthy dogs and a 72.4% between the lame and non-lame limb in the lame dog group. Asymmetry index analysis revealed 5% in the healthy group and 36.2% in the lame group. The optimal cutoff point for the peak vertical force to determine lameness was 41.77% (AUC = 0.93) and for MII 0.943% (AUC = 0.72). The results of this study highlight the change in the thermal pattern of the paw print in the lame pelvic limb compared to a non-lame pelvic limb in the lame group and the healthy group. Medical infrared imaging of the paw prints can be utilized to screen for the lame limb in dogs.
Keywords: Cruciate, Infrared imaging, Lameness, Orthostatic analysis.
Cite this paper:
Garcia, E.F.V., Loughin, C.A., Marino, D.J., Sackman, J., Umbaugh, S.E., Fu, J., Subedi, S., Lesser, M.L., Akerman, M. and Schossler, J.E.W. 2017. Medical infrared imaging and orthostatic
analysis to determine lameness in the pelvic limbs of dogs. Open Vet. J. 7(4), 342-348.