Pauwels Frederik E, Rogers Chris W, Wharton Heather, Flemming Hailey, Wightman Paul F, Green Ron W
Institute of Veterinary and Biomedical Sciences, Massey University, Palmerston North, New Zealand.
Vet Radiol Ultrasound. 2017 Jan;58(1):10-17. doi: 10.1111/vru.12443. Epub 2016 Nov 17.
Hoof balance radiographs are commonly used as the basis for corrective farriery decision-making in horses, however there are limited published data quantifying effects of the stance of the horse or the horizontal radiographic beam angle. In this analytical study, the influence of variation of the horse's stance in the craniocaudal and lateromodial plane on hoof balance measurements as well as the influence of variation of the horizontal radiographic beam angle on dorsopalmar hoof balance measurements was examined. Distal left thoracic limb lateromedial radiographs were acquired using a standardized protocol while varying the craniocaudal stance of five horses, each selected to be sound and conformationally normal. Dorsopalmar foot radiographs were acquired while varying the lateromedial stance; and variable angle horizontal beam dorsopalmar foot radiographs were acquired while keeping the limb position constant. Analyses of measurements demonstrated that hoof pastern angle had a linear relationship (R = 0.89, P < 0.001) with craniocaudal stance of the horse. The relationship of joint angle and stance was greater for the distal interphalangeal joint angle (R = 0.89, P < 0.001) than the proximal interphalangeal joint angle (R = 0.65, P = 0.001). The distal phalanx angle did not change with craniocaudal stance variation. The proximal interphalangeal joint width, distal interphalangeal joint width, or distal phalanx height did not change with lateromedial stance variation, nor within a 15 degree dorsolateral to caudomedial and dorsomedial to caudolateral variation from the dorsopalmar axis. Findings indicated that positioning of the thoracic limb needs to be considered during radiographic interpretation and decision-making for corrective farriery.
蹄平衡X线片通常用作马匹矫正蹄铁匠决策的依据，然而，关于马匹站立姿势或水平X线光束角度影响的已发表数据有限。在这项分析研究中，研究了马匹在头尾平面和内外侧平面的姿势变化对蹄平衡测量的影响，以及水平X线光束角度变化对背掌蹄平衡测量的影响。使用标准化方案获取左胸远端肢体的内外侧X线片，同时改变五匹马的头尾姿势，每匹马均被选择为健康且外形正常。在改变内外侧姿势时获取背掌足部X线片；在保持肢体位置不变的情况下获取可变角度水平光束背掌足部X线片。测量分析表明，蹄系部角度与马匹的头尾姿势呈线性关系（R = 0.89，P < 0.001）。远侧指间关节角度与姿势之间的关系（R = 0.89，P < 0.001）比近侧指间关节角度（R = 0.65，P = 0.001）与姿势之间的关系更大。远节指骨角度不会随着头尾姿势的变化而改变。近侧指间关节宽度、远侧指间关节宽度或远节指骨高度不会随着内外侧姿势的变化而改变，也不会在背掌轴的背外侧至尾内侧以及背内侧至尾外侧15度的变化范围内改变。研究结果表明，在进行矫正蹄铁匠的X线片解读和决策时，需要考虑胸肢的位置。
