Sato Fumio, Endo Yoshiro, Horiuchi Noriyuki, Tominari Masataka, Murase Harutaka, Ishimaru Mutsuki, Korosue Kenji
Department of Equine Breeding Science, Hidaka Training and Research Center, Japan Racing Association, Hokkaido 057-0171, Japan.
United Graduate School of Veterinary Sciences, Gifu University, Gifu 501-1193, Japan.
J Equine Sci. 2017;28(3):123-126. doi: 10.1294/jes.28.123. Epub 2017 Sep 20.
Although radiographic findings at the apical portion of the proximal sesamoid bone (PSB) are often observed in young Thoroughbred foals, conflicting findings, either fractures or apparent secondary ossifications centers, have been reported. Three cases (aged 2, 5, and 7 weeks) were identified in 30 necropsied foals (0-31 weeks old). Histopathologically, the subchondral trabecular woven bone was fractured and exhibited focal necrosis of woven bone, fibrin exudate, and/or fibrosis within the foci. In the 7-week-old case, proliferations of chondrocytes were also observed. These findings suggest that the radiographic findings represented a healing process of the apical PSB fractures associated with the mechanically damaged subchondral trabeculae. Developmental PSB injuries should be taken into consideration during the management of young Thoroughbred foals.
尽管在年轻的纯种马驹中，常常能观察到近端籽骨（PSB）顶端的影像学表现，但也有关于骨折或明显的继发性骨化中心等相互矛盾的报道。在30匹进行了尸检的马驹（年龄0 - 31周）中发现了3例（年龄分别为2周、5周和7周）。组织病理学检查显示，软骨下小梁编织骨发生骨折，并在病灶内出现编织骨局灶性坏死、纤维蛋白渗出和/或纤维化。在7周龄的病例中，还观察到软骨细胞增殖。这些发现表明，影像学表现代表了与机械性损伤的软骨下小梁相关的PSB顶端骨折的愈合过程。在年轻纯种马驹的管理过程中，应考虑到发育性PSB损伤。
