Samii V F, Hornof W J
Department of Surgical and Radiological Sciences, School of Veterinary Medicine, University of California, Davis 95616, USA.
Vet Radiol Ultrasound. 2000 Mar-Apr;41(2):147-53. doi: 10.1111/j.1740-8261.2000.tb01469.x.
The purpose of this study was to evaluate the occurrence of humeral condylar fractures in Vietnamese pot-bellied pigs and to postulate a possible predisposing cause for these fractures. Thirteen Vietnamese pot-bellied pigs (Group A) were evaluated over an eight year period (1990-1998), each with a history of either a unilateral or bilateral forelimb lameness. The cause of lameness was localized to the elbow region. Of the thirteen pigs, twenty-one elbows were evaluated radiographically. Pigs ranged in age from six months to four years old. All pigs over the age of seven months showed radiographic evidence of elbow degenerative joint disease. Fractures involving the medial aspect of the humeral condyle were identified in 8/21 studies (38%). A well-defined linear intracondylar articular lucency was identified in 7/21 studies (33%) on the craniocaudal projection. The site of this lucency corresponded to the location of the articular component of the fractures seen involving the humeral condyle. The elbows of five pot-bellied pigs with no known history of forelimb lameness or trauma (Group B) were evaluated radiographically following euthanasia. All five pigs were of unknown age and gender. An intracondylar vertical linear lucency was identified bilaterally in three pigs (60%). Concurrent degenerative joint disease was present in all instances. The remaining two pigs were radiographically normal. Computed tomography of the elbows was performed in one affected pig from Group B. The radiographic findings in this pig were verified. Histopathology of the right elbow of this affected pig was diagnostic for incomplete endochondral ossification of the humeral condyle. A similar condition involving the humeral condyle has been previously described in Cocker and Brittany Spaniels. These canine breeds also have a high incidence of humeral condylar fractures. It is postulated that Vietnamese pot-bellied pigs are similarly prone to humeral condylar fractures, even in the absence of known trauma, due to incomplete ossification of the humeral condyle.
本研究的目的是评估越南大肚猪肱骨髁骨折的发生率，并推测这些骨折可能的诱发原因。在八年时间（1990 - 1998年）里对13头越南大肚猪（A组）进行了评估，每头猪都有单侧或双侧前肢跛行的病史。跛行原因定位于肘部区域。在这13头猪中，对21个肘部进行了放射学评估。猪的年龄范围从6个月到4岁。所有7个月以上的猪都有肘部退行性关节病的放射学证据。在21次研究中有8次（38%）发现涉及肱骨髁内侧的骨折。在21次研究中的7次（33%）在头尾位投照中发现了一条清晰的线性髁内关节透亮区。该透亮区的位置与所见涉及肱骨髁骨折的关节部分的位置相对应。对5头无前肢跛行或创伤已知病史的越南大肚猪（B组）在安乐死后进行了肘部放射学评估。所有5头猪的年龄和性别均未知。在3头猪（60%）中双侧发现了髁内垂直线形透亮区。所有病例均存在并发的退行性关节病。其余2头猪放射学检查正常。对B组中1头患病猪的肘部进行了计算机断层扫描。该猪的放射学检查结果得到了证实。这头患病猪右肘的组织病理学检查诊断为肱骨髁软骨内骨化不完全。先前在可卡犬和不列塔尼猎犬中也描述过类似的涉及肱骨髁的情况。这些犬种肱骨髁骨折的发生率也很高。据推测，越南大肚猪即使在没有已知创伤的情况下，由于肱骨髁骨化不完全，同样容易发生肱骨髁骨折。
