Arzi Boaz, Verstraete Frank J M, Garcia Tanya C, Lee Monica, Kim Se Eun, Stover Susan M
Am J Vet Res. 2019 Jul;80(7):637-645. doi: 10.2460/ajvr.80.7.637.
To evaluate and quantify the kinematic behavior of canine mandibles before and after bilateral rostral or unilateral segmental mandibulectomy as well as after mandibular reconstruction with a locking reconstruction plate in ex vivo conditions.
Head specimens from cadavers of 16 dogs (range in body weight, 30 to 35 kg).
Specimens were assigned to undergo unilateral segmental (n = 8) or bilateral rostral (8) mandibulectomy and then mandibular reconstruction by internal fixation with locking plates. Kinematic markers were attached to each specimen in a custom-built load frame. Markers were tracked in 3-D space during standardized loading conditions, and mandibular motions were quantified. Differences in mandibular range of motion among 3 experimental conditions (before mandibulectomy [ie, with mandibles intact], after mandibulectomy, and after reconstruction) were assessed by means of repeated-measures ANOVA.
Both unilateral segmental and bilateral rostral mandibulectomy resulted in significantly greater mandibular motion and instability, compared with results for intact mandibles. No significant differences in motion were detected between mandibles reconstructed after unilateral segmental mandibulectomy and intact mandibles. Similarly, the motion of mandibles reconstructed after rostral mandibulectomy was no different from that of intact mandibles, except in the lateral direction.
Mandibular kinematics in head specimens from canine cadavers were significantly altered after unilateral segmental and bilateral rostral mandibulectomy. These alterations were corrected after mandibular reconstruction with locking reconstruction plates. Findings reinforced the clinical observations of the beneficial effect of reconstruction on mandibular function and the need for reconstructive surgery after mandibulectomy in dogs.
在体外条件下，评估和量化双侧喙部或单侧节段性下颌骨切除术前、后犬下颌骨的运动行为，以及使用锁定重建钢板进行下颌骨重建后的运动行为。
16只犬（体重范围为30至35千克）尸体的头部标本。
将标本分为接受单侧节段性（n = 8）或双侧喙部（8）下颌骨切除术，然后通过锁定钢板内固定进行下颌骨重建。在定制的加载框架中，将运动标记物附着于每个标本上。在标准化加载条件下，在三维空间中跟踪标记物，并对下颌运动进行量化。通过重复测量方差分析评估3种实验条件（下颌骨切除术前[即下颌骨完整]、下颌骨切除术后和重建后）之间下颌运动范围的差异。
与完整下颌骨相比，单侧节段性和双侧喙部下颌骨切除术均导致下颌运动显著增加且不稳定。单侧节段性下颌骨切除术后重建的下颌骨与完整下颌骨之间未检测到运动方面的显著差异。同样，喙部下颌骨切除术后重建的下颌骨的运动与完整下颌骨的运动无差异，除了在侧向方向。
犬尸体头部标本中的下颌骨运动学在单侧节段性和双侧喙部下颌骨切除术后发生了显著改变。使用锁定重建钢板进行下颌骨重建后，这些改变得到了纠正。研究结果强化了关于重建对下颌骨功能有益作用的临床观察，以及犬下颌骨切除术后进行重建手术的必要性。
