Anthenill Lucy A, Stover Susan M, Gardner Ian A, Hill Ashley E, Lee Christina M, Anderson Mark L, Barr Bradd C, Read Deryck H, Johnson Bill J, Woods Leslie W, Daft Barbara M, Kinde Hailu, Moore Janet D, Farman Cynthia A, Odani Jenee S, Pesavento Patricia A, Uzal Francisco A, Case James T, Ardans Alex A
JD Wheat Veterinary Orthopedic Research Laboratory, Department of Anatomy, Physiology, and Cell Biology, School of Veterinary Medicine, University of California, Davis, CA 95616, USA.
Am J Vet Res. 2006 May;67(5):858-68. doi: 10.2460/ajvr.67.5.858.
To determine the distribution for limbs and bones in horses with fractures of the proximal sesamoid bones and relationships with findings on palmarodorsal radiographic images.
Proximal sesamoid bones obtained from both forelimbs of cadavers of 328 racing Thoroughbreds.
Osteophytes; large vascular channels; and fracture location, orientation, configuration, and margin distinctness were categorized by use of high-detail contact palmarodorsal radiographs. Distributions of findings were determined. Relationships between radiographic findings and fracture characteristics were examined by use of chi2 and logistic regression techniques.
Fractures were detected in 136 (41.5%) horses. Biaxial fractures were evident in 109 (80%) horses with a fracture. Osteophytes and large vascular channels were evident in 266 (81%) and 325 (99%) horses, respectively. Medial bones typically had complete transverse or split transverse simple fractures, indistinct fracture margins, > 1 vascular channel that was > 1 mm in width, and osteophytes in abaxial wing and basilar middle or basilar abaxial locations. Lateral bones typically had an oblique fracture and distinct fracture margins. Odds of proximal sesamoid bone fracture were approximately 2 to 5 times higher in bones without radiographic evidence of osteophytes or large vascular channels, respectively.
Biaxial fractures of proximal sesamoid bones were common in cadavers of racing Thoroughbreds. Differences between medial and lateral bones for characteristics associated with fracture may relate to differences in fracture pathogeneses for these bones. Osteophytes and vascular channels were common findings; however, fractures were less likely to occur in bones with these features.
确定近籽骨骨折马匹四肢及骨骼的分布情况，并探讨其与掌背位X线影像表现的关系。
取自328匹纯种赛马尸体前肢的近籽骨。
使用高分辨率掌背位X线片对骨赘、大血管通道以及骨折位置、方向、形态和边缘清晰度进行分类。确定各项表现的分布情况。采用卡方检验和逻辑回归技术研究X线影像表现与骨折特征之间的关系。
136匹（41.5%）马匹检测到骨折。109匹（80%）骨折马匹存在双轴骨折。266匹（81%）马匹可见骨赘，325匹（99%）马匹可见大血管通道。内侧籽骨通常有完全横行或劈裂横行简单骨折，骨折边缘不清晰，有1条以上宽度大于1mm的血管通道，在远轴侧翼以及基底中部或基底远轴侧位置有骨赘。外侧籽骨通常有斜形骨折，骨折边缘清晰。无骨赘或大血管通道X线证据的籽骨发生骨折的几率分别高出约2至5倍。
近籽骨双轴骨折在纯种赛马尸体中很常见。内侧和外侧籽骨在与骨折相关特征上的差异可能与这些籽骨骨折发病机制的差异有关。骨赘和血管通道是常见表现；然而，有这些特征的籽骨发生骨折的可能性较小。
