Cripps P J, Eustace R A
Department of Veterinary Clinical Science and Animal Husbandry, University of Liverpool, South Wirral, UK.
Equine Vet J. 1999 Sep;31(5):427-32. doi: 10.1111/j.2042-3306.1999.tb03844.x.
Lateromedial radiographic projections were made from the feet of 25 normal horses and 3 angles and 3 distances were measured. From these, normal ranges of calculated variables were obtained. The width and length of each foot and the height of the horse at the withers was also measured. In view of its possible importance in clinical laminitis, particular attention was paid to 'founder' distance (D). This is the vertical distance between the proximal limit of the dorsal hoof wall and the proximal limit of the extensor process of the distal phalanx. There were significant differences between breeds in D (P<0.05) and in wall thickness (P<0.01). Further studies investigated the effects of time, differing radiographic projections and different operators on D. D did not alter significantly (P>0.05) over a 6 week study period. It was concluded that errors due to radiographic beam obliquity were not of practical importance. Errors in measuring D between operators can be minimised by use of a standard radiographic technique. Although there was some variation in the value of D measured over time and with different operators, which could make the interpretation of early or subtle changes difficult, measurement variation was not considered to interfere with the assessment of large changes associated with severe laminitis.
对25匹正常马匹的足部进行了内外侧X线摄影投影，并测量了3个角度和3个距离。据此得出计算变量的正常范围。还测量了每只蹄的宽度和长度以及马匹肩隆部的高度。鉴于“蹄叶炎起始距离”（D）在临床蹄叶炎中可能具有重要意义，因此对其给予了特别关注。该距离是背侧蹄壁近端与远节趾骨伸肌突近端之间的垂直距离。不同品种的D值（P<0.05）和蹄壁厚度（P<0.01）存在显著差异。进一步的研究调查了时间、不同的X线摄影投影和不同操作人员对D值的影响。在为期6周的研究期间，D值没有显著变化（P>0.05）。得出的结论是，因X线射束倾斜导致的误差在实际中并不重要。通过使用标准的X线摄影技术，可以将操作人员测量D值时的误差降至最低。尽管随着时间推移以及不同操作人员测量，D值存在一些变化，这可能使早期或细微变化的解读变得困难，但测量变化被认为不会干扰与严重蹄叶炎相关的大变化的评估。
