Laboratory of Physiology II, School of Veterinary Medicine, Azabu University, Sagamihara, Kanagawa, Japan.
ONE for Animals, Yokohama, Kanagawa, Japan.
Vet Surg. 2021 Aug;50(6):1304-1315. doi: 10.1111/vsu.13671. Epub 2021 May 26.
Evaluate center of mass (CoM) displacement values during four-limb and three-limb standing with limb suspension in dogs before and after applying sensory stimulation to a forelimb or hindlimb.
Experimental study.
Six clinically normal beagles.
A four force-plate apparatus was built to assess static weight distribution. Dogs stood on the device with one limb in contact with each force plate. We created a plastic device to induce sensory stimulation so that lameness could not be detected visually when stimulating the paw. Experimenters confirmed the degree of lameness by walking before and after measurement. Body-weight shifts were induced via suspension of each limb and transient sensory stimulation to the right forelimb or left hindlimb. CoMs of five postures were compared, with and without transient sensory stimulation.
The four-limb CoM was located cranial to the center of the X- and Y-axis coordinates (X: -0.82 ± 9.12, Y: 61.00 ± 5.82). During three-limb standing with suspension of either forelimb, CoM shifted backward toward the contralateral side compared to four-limb standing. During hindlimb suspension, CoM shifted to the contralateral side. With right forelimb sensory stimulation, there were large CoM changes for both four-limb and three-limb standing (X: -34.53 ± 9.09, Y: 52.21 ± 6.88). CoM changes were small with left hindlimb sensory stimulation (X: 6.47 ± 13.86, Y: 69.41 ± 5.55).
CoMs during four-limb and three-limb standing were influenced by sensory stimulation of a forelimb and, to a lesser extent, of a hindlimb.
Static evaluation of CoM may aid clinicians in the diagnosis and recovery of forelimb lameness.
评估四条腿和三条腿站立时犬四肢悬停前后，对前肢或后肢施加感觉刺激时质心（CoM）位移值。
实验研究。
六只临床正常比格犬。
构建了一个四力板装置来评估静态重量分布。狗站在设备上，一只脚与每个力板接触。我们创建了一个塑料装置来诱导感觉刺激，以便在刺激爪子时无法通过视觉检测到跛行。实验者在测量前后通过行走来确认跛行的程度。通过悬挂每条腿和短暂的右侧前肢或左侧后肢感觉刺激来引起体重转移。比较了有和没有短暂感觉刺激的五个姿势的 CoM。
四肢 CoM 位于 X 和 Y 轴坐标（X：-0.82±9.12，Y：61.00±5.82）的头部。在前肢悬停的三条腿站立时，CoM 与四肢站立相比向后移向对侧。在后肢悬停时，CoM 移向对侧。在右侧前肢感觉刺激时，四肢和三条腿站立的 CoM 变化较大（X：-34.53±9.09，Y：52.21±6.88）。左侧后肢感觉刺激时 CoM 变化较小（X：6.47±13.86，Y：69.41±5.55）。
四肢和三条腿站立时的 CoM 受前肢和后肢感觉刺激的影响，后肢的影响较小。
CoM 的静态评估可能有助于临床医生诊断和恢复前肢跛行。
