目的:使用外部固定器在指甲上延长腿部(LON)的机械特性尚不为人所知;特别是,该方法所需的环和K线的数量尚未确定。这项研究旨在比较使用家用车架的最简单配置的腿部LON的机械特性和仅使用Ilizarov车架的腿部加长的机械特性。
方法:通过评估轴向压缩来评估牛胫骨样本在髓内钉上加长与家用外固定器(LON样本)和用Ilizarov框架加长(Ilizarov样本)的机械特性,弯曲载荷,和扭转载荷。研究指标为压缩刚度,弯曲刚度,扭转刚度,屈服轴向载荷,极限轴向载荷,屈服弯曲载荷,和极限弯曲载荷。
结果:在压缩刚度方面没有观察到统计学上的显着差异,极限轴向载荷,弯曲刚度,最终,Ilizarov样品和LON样品之间的屈服弯曲力。抗压刚度,屈服轴向载荷,LON样品的极限轴向载荷为98±1.31N/mm,915±23.89N,和1032±29.86N,分别。LON试样的前后抗弯刚度和侧向抗弯刚度分别为122.48±2.92N/mm和116.34±3.95N/mm,分别。LON样品的屈服前后弯曲力和极限前后弯曲力为616.4±3.64N和753.2±3.49N,分别。LON样品的屈服侧向弯曲力和极限侧向弯曲力为624.6±4.04N和759.0±3.39N,分别。LON样品的轴向扭转刚度为1.73±0.05Nm/°,显著低于Ilizarov样品(2.63±0.03Nm/°)。
结论:在Ilizarov样品和LON样品之间的轴向压缩和弯曲的机械固定特性方面没有观察到统计学上的显着差异。然而,Ilizarov样本的轴向扭转刚度在统计学上大于LON样本。我们建议使用最简单的配置与LON结合的家用框架来延长肢体。在牵引阶段允许部分承重。
方法:病例对照研究。
OBJECTIVE: The mechanical characteristics of leg lengthening over a nail (
LON) using an external fixator are not well known; specifically, the number of rings and K-wires required for this method has not been determined. This study aimed to compare the mechanical characteristics of leg
LON using the simplest configuration for a domestic frame and those of leg lengthening using the Ilizarov frame alone.
METHODS: The mechanical characteristics of cow tibial samples for lengthening over an intramedullary nail in combination with a domestic external fixator (
LON samples) and for lengthening with the Ilizarov frame (Ilizarov samples) were evaluated by assessing axial compression, bending load, and torsional load. The research indices were compression stiffness, bending stiffness, torsion stiffness, yield axial load, ultimate axial load, yield bending load, and ultimate bending load.
RESULTS: No statistically significant differences were observed in the compression stiffness, ultimate axial load, bending stiffness, and ultimate, yield bending forces between the Ilizarov samples and LON samples. The compressive stiffness, yield axial load, and ultimate axial load of the
LON samples were 98 ± 1.31 N/mm, 915 ± 23.89 N, and 1032 ± 29.86 N, respectively. The anterior-posterior bending stiffness and lateral bending stiffness of the
LON samples were 122.48 ± 2.92 N/mm and 116.34 ± 3.95 N/mm, respectively. The yield anterior-posterior bending and ultimate anterior-posterior bending forces of the LON samples were 616.4 ± 3.64 N and 753.2 ± 3.49 N, respectively. The yield lateral bending and ultimate lateral bending forces of the LON samples were 624.6 ± 4.04 N and 759.0 ± 3.39 N, respectively. The axial torsional stiffness of the LON samples was 1.73 ± 0.05 N m/°, which was significantly lower than that of the Ilizarov samples (2.63 ± 0.03 N m/°).
CONCLUSIONS: No statistically significant differences were observed in the mechanical fixation characteristics of axial compression and bending between the Ilizarov samples and LON samples. However, the axial torsional stiffness of the Ilizarov samples was statistically greater than that of the LON samples. We recommend using the simplest configuration for domestic frames in combination with LON for limb lengthening. Partial weight-bearing is permitted in the distraction stage.
METHODS: Case-control study.