Childs Bronwen A, Pugliese Brenna R, Carballo Cristina T, Miranda Daniel L, Brainerd Elizabeth L, Kirker-Head Carl A
Carl A. Kirker-Head, Department of Clinical Sciences, Cummings School of Veterinary Medicine, Tufts University, 200 Westboro Road, North Grafton, MA 01536, United States, Phone: +1 508 839 7926, Fax: +1 508 839 7922, E-mail:
Vet Comp Orthop Traumatol. 2017 Jul 20;30(4):248-255. doi: 10.3415/VCOT-16-06-0095. Epub 2017 May 5.
X-ray reconstruction of moving morphology (XROMM) uses biplanar videoradiography and computed tomography (CT) scanning to capture three-dimensional (3D) bone motion. In XROMM, morphologically accurate 3D bone models derived from CT are animated with motion from videoradiography, yielding a highly accurate and precise reconstruction of skeletal kinematics. We employ this motion analysis technique to characterize metacarpophalangeal joint (MCPJ) motion in the absence and presence of protective legwear in a healthy pony. Our in vivo marker tracking precision was 0.09 mm for walk and trot, and 0.10 mm during jump down exercises. We report MCPJ maximum extension (walk: -27.70 ± 2.78° [standard deviation]; trot: -33.84 ± 4.94°), abduction/adduction (walk: 0.04 ± 0.24°; trot: -0.23 ± 0.35°) and external/internal rotations (walk: 0.30 ± 0.32°; trot: -0.49 ± 1.05°) indicating that the MCPJ in this pony is a stable hinge joint with negligible extra-sagittal rotations. No substantial change in MCPJ maximum extension angles or vertical ground reaction forces (GRFv) were observed upon application of legwear during jump down exercise. Neoprene boot application yielded -65.20 ± 2.06° extension (GRFv = 11.97 ± 0.67 N/kg) and fleece polo wrap application yielded -64.23 ± 1.68° extension (GRFv = 11.36 ± 1.66 N/kg), when compared to naked control (-66.11 ± 0.96°; GRFv = 12.02 ± 0.53 N/kg). Collectively, this proof of concept study illustrates the benefits and practical limitations of using XROMM to document equine MCPJ kinematics in the presence and absence of legwear.
运动形态X射线重建（XROMM）利用双平面视频X射线摄影和计算机断层扫描（CT）来捕捉三维（3D）骨骼运动。在XROMM中，从CT获得的形态精确的3D骨骼模型与视频X射线摄影中的运动进行动画处理，从而实现对骨骼运动学的高度准确和精确的重建。我们采用这种运动分析技术来表征健康小马在有无防护性腿部装备情况下的掌指关节（MCPJ）运动。我们在体内的标记跟踪精度在行走和小跑时为0.09毫米，在跳下练习时为0.10毫米。我们报告了MCPJ的最大伸展度（行走：-27.70±2.78°[标准差]；小跑：-33.84±4.94°）、外展/内收（行走：0.04±0.24°；小跑：-0.23±0.35°）和外旋/内旋（行走：0.30±0.32°；小跑：-0.49±1.05°），这表明这匹小马的MCPJ是一个稳定的铰链关节，矢状面外旋转可忽略不计。在跳下练习中使用腿部装备后，未观察到MCPJ最大伸展角度或垂直地面反作用力（GRFv）有实质性变化。与裸身对照组（-66.11±0.96°；GRFv = 12.02±0.53 N/kg）相比，使用氯丁橡胶靴时伸展度为-65.2±2.06°（GRFv = 11.97±0.67 N/kg），使用羊毛马球绷带时伸展度为-64.23±1.68°（GRFv = 11.36±1.66 N/kg）。总体而言，这项概念验证研究说明了使用XROMM记录有无腿部装备情况下马的MCPJ运动学的益处和实际局限性。
