Umphlet R C, Johnson A L, Eurell J C, Losonsky J
Department of Veterinary Clinical Medicine, College of Veterinary Medicine, University of Illinois, Urbana.
Vet Surg. 1988 Jul-Aug;17(4):186-93. doi: 10.1111/j.1532-950x.1988.tb00996.x.
Partial rostral hemimandibulectomy was performed in 10 adult dogs. The temporomandibular joints (TMJs) were examined radiographically and tomographically before surgery, and mandibular stability was evaluated before and immediately after surgery. Radiographic, tomographic, and hemimandibular mobility assessments were made again at months 3 and 6. The TMJs were examined grossly and histologically in five dogs euthanatized at month 3 and in five dogs euthanatized at month 6. Statistically significant hemimandibular instability (p less than 0.05) persisted in all subjects throughout the study. The radiographic appearance of the joints remained unaltered; however, space asymmetry was identified in postoperative tomograms of three dogs at month 3 and four dogs at month 6. The TMJs were grossly normal at necropsy. Histologically, there were degenerative changes in articular cartilage and subchondral bone in all of the joints. The authors conclude that partial rostral hemimandibulectomy causes TMJ degeneration, as a consequence of hemimandibular instability or abnormal loading, or both.
对10只成年犬实施了部分喙侧半下颌骨切除术。术前对颞下颌关节（TMJ）进行了X线摄影和断层扫描检查，并在手术前后评估下颌稳定性。在术后3个月和6个月再次进行X线摄影、断层扫描和半下颌骨活动度评估。对术后3个月安乐死的5只犬和术后6个月安乐死的5只犬的TMJ进行大体和组织学检查。在整个研究过程中，所有受试对象均持续存在统计学上显著的半下颌骨不稳定（p<0.05）。关节的X线表现未改变；然而，在术后3个月的3只犬和6个月的4只犬的断层扫描图像中发现了间隙不对称。尸检时TMJ大体正常。组织学上，所有关节的关节软骨和软骨下骨均有退行性改变。作者得出结论，部分喙侧半下颌骨切除术会导致TMJ退变，这是半下颌骨不稳定或异常负荷或两者共同作用的结果。
