Abstract：
OBJECTIVE: The orbital floor is frequently involved in head trauma. Current evidence on the use of reconstruction materials for orbital floor repair is inconclusive. Accordingly, this study aimed to compare the impact of polydioxanone (PDS) foil thickness on reconstruction of the orbital geometry after isolated orbital floor fractures.
METHODS: Standardized isolated orbital floor fractures were symmetrically created in 11 cadaver heads that provided 22 orbits. PDS foils with thicknesses of 0.25-0.5 mm were inserted. Computed tomography (CT) scans of the native, fractured, and reconstructed orbits were obtained, and orbital volume, orbital height, and foil bending were measured.
RESULTS: Orbital volume and height significantly (p < 0.01) increased after the creation of isolated orbital floor fractures and significantly (p = 0.001) decreased with overcorrection of the orbital geometry after orbital floor reconstruction with PDS 0.25 mm or PDS 0.5 mm. The orbital geometry reconstruction rate did not differ significantly with respect to foil thickness. However, compared to PDS 0.5 mm, the use of PDS 0.25 mm resulted in quantitatively higher reconstructive accuracy and a restored orbital volume that did not significantly differ from the initial volume.
CONCLUSIONS: Orbital floors subjected to isolated fractures were successfully reconstructed using PDS regardless of foil thickness, with overcorrection of the orbital geometry. Due to its lower flexural stiffness, PDS 0.25 mm appeared to provide more accurate orbital geometry reconstruction than PDS 0.5 mm, although no significant difference in reconstructive accuracy between PDS 0.25 mm and PDS 0.5 mm was observed in this cadaveric study.
METHODS: Standardized isolated orbital floor fractures were symmetrically created in 11 cadaver heads that provided 22 orbits. PDS foils with thicknesses of 0.25-0.5 mm were inserted. Computed tomography (CT) scans of the native, fractured, and reconstructed orbits were obtained, and orbital volume, orbital height, and foil bending were measured.
RESULTS: Orbital volume and height significantly (p < 0.01) increased after the creation of isolated orbital floor fractures and significantly (p = 0.001) decreased with overcorrection of the orbital geometry after orbital floor reconstruction with PDS 0.25 mm or PDS 0.5 mm. The orbital geometry reconstruction rate did not differ significantly with respect to foil thickness. However, compared to PDS 0.5 mm, the use of PDS 0.25 mm resulted in quantitatively higher reconstructive accuracy and a restored orbital volume that did not significantly differ from the initial volume.
CONCLUSIONS: Orbital floors subjected to isolated fractures were successfully reconstructed using PDS regardless of foil thickness, with overcorrection of the orbital geometry. Due to its lower flexural stiffness, PDS 0.25 mm appeared to provide more accurate orbital geometry reconstruction than PDS 0.5 mm, although no significant difference in reconstructive accuracy between PDS 0.25 mm and PDS 0.5 mm was observed in this cadaveric study.
摘要：
目的：眶底经常受累于头部外伤。目前关于使用重建材料进行轨道地板修复的证据尚无定论。因此，本研究旨在比较聚二恶烷酮（PDS）箔厚度对孤立眶底骨折后眶几何结构重建的影响。
方法：在提供22个轨道的11具尸体头部中对称地创建标准化的孤立眼眶底骨折。插入厚度为0.25-0.5mm的PDS箔。计算机断层扫描（CT）扫描的本地，骨折,并获得了重建的轨道，和轨道体积，轨道高度,和箔弯曲进行了测量。
结果：产生孤立的眶底骨折后，眼眶体积和高度显着增加（p<0.01），并且在眶底重建后过度矫正眼眶几何结构显着（p=0.001）减少PDS0.25mm或PDS0.5mm。轨道几何形状重建率相对于箔厚度没有显着差异。然而,与PDS0.5毫米相比，使用0.25mm的PDS在数量上提高了重建精度,并恢复了与初始体积无显著差异的轨道体积.
结论：无论箔片厚度如何，使用PDS成功重建了孤立骨折的轨道地板，轨道几何的过度校正。由于其较低的弯曲刚度，PDS0.25mm似乎比PDS0.5mm提供更准确的轨道几何重建，尽管在这项尸体研究中，PDS0.25mm和PDS0.5mm的重建准确性没有显着差异。
方法：在提供22个轨道的11具尸体头部中对称地创建标准化的孤立眼眶底骨折。插入厚度为0.25-0.5mm的PDS箔。计算机断层扫描（CT）扫描的本地，骨折,并获得了重建的轨道，和轨道体积，轨道高度,和箔弯曲进行了测量。
结果：产生孤立的眶底骨折后，眼眶体积和高度显着增加（p<0.01），并且在眶底重建后过度矫正眼眶几何结构显着（p=0.001）减少PDS0.25mm或PDS0.5mm。轨道几何形状重建率相对于箔厚度没有显着差异。然而,与PDS0.5毫米相比，使用0.25mm的PDS在数量上提高了重建精度,并恢复了与初始体积无显著差异的轨道体积.
结论：无论箔片厚度如何，使用PDS成功重建了孤立骨折的轨道地板，轨道几何的过度校正。由于其较低的弯曲刚度，PDS0.25mm似乎比PDS0.5mm提供更准确的轨道几何重建，尽管在这项尸体研究中，PDS0.25mm和PDS0.5mm的重建准确性没有显着差异。
