Ghaderi Saeed, Goodarzi Nader
Faculty of Veterinary Medicine, Razi University, Kermanshah, Iran.
Department of Basic Sciences and Pathobiology, Faculty of Veterinary Medicine, Razi University, Kermanshah, Iran.
Anat Histol Embryol. 2023 Mar;52(2):241-253. doi: 10.1111/ahe.12877. Epub 2022 Oct 25.
This study was aimed to provide anatomical atlas of the ovine metacarpo/metatarsophalangeal joints using computed tomography (CT) scan and magnetic resonance imaging (MRI), as well as to investigate bone mineral density (BMD) and morphometric features of this joint. The limbs of twenty adult Sanjabi sheep were examined. Imaging was performed using a 16-slice multi-detector CT scanner and a 1.5 Tesla MRI scanner. The obtained images were correlated with corresponding anatomical sections. BMD was measured by Dual Energy X-ray Absorptiometry (DEXA) method. Also morphometric features included distance between metacarpal and metatarsal heads, width of metacarpal and metatarsal head, length, width and the height of the proximal sesamoid bones were measured. In MRI images, compact bones, ligaments and tendons showed less signal intensity (hypointense). The fatty tissue and bone marrow had more signal intensity (hyperintense), but articular cartilage and synovial fluid showed moderate signal intensity. BMD in the left hind limb was significantly higher than other three limbs (p ≤ 0.05). The length of proximal sesamoid bones in left forelimb was higher than right forelimb (p ≤ 0.05). The thickness of proximal sesamoid bones in left limbs was higher than those in their counterparts (p ≤ 0.05). The width of the medial head in the forelimbs was significantly greater than the hind limbs (p ≤ 0.05). The present results might be useful in managing the clinical techniques on this joint. Larger volume of the proximal sesamoid bones and wider medial head in the forelimbs compared to the hindlimbs impel this speculation that the centre of gravity is closer to the forelimbs.
本研究旨在利用计算机断层扫描（CT）和磁共振成像（MRI）提供绵羊掌指/跖趾关节的解剖图谱，并研究该关节的骨密度（BMD）和形态学特征。对20只成年桑贾比绵羊的四肢进行了检查。使用16层多探测器CT扫描仪和1.5特斯拉MRI扫描仪进行成像。将获得的图像与相应的解剖切片进行对照。通过双能X线吸收法（DEXA）测量骨密度。还测量了形态学特征，包括掌骨和跖骨头之间的距离、掌骨和跖骨头的宽度、近籽骨的长度、宽度和高度。在MRI图像中，密质骨、韧带和肌腱显示出较低的信号强度（低信号）。脂肪组织和骨髓具有较高的信号强度（高信号），但关节软骨和滑液显示出中等信号强度。左后肢的骨密度显著高于其他三个肢体（p≤0.05）。左前肢近籽骨的长度高于右前肢（p≤0.05）。左肢近籽骨的厚度高于其对应侧（p≤0.05）。前肢内侧头的宽度显著大于后肢（p≤0.05）。目前的结果可能有助于管理该关节的临床技术。与后肢相比，前肢近籽骨体积更大且内侧头更宽，这促使人们推测重心更靠近前肢。
