Introduction: Unilateral external fixators are widely used in orthopedics to stabilize fractured bones and to treat limb deformities. One of the main problems is that it is difficult to detect healing status. In addition, whether load transfer progress between the fixator and bone model are the same under axial, torsional, and bending loads has not been studied. Methods: Therefore the main purpose of this study was to detect the load transfer process between the fixator and a bone model by measuring strains on the fixator–bone system during four healing states using experimental and finite element methods. In the experimental method, 20 strain gauges were used to measure strain on the fixator and bone model under three load conditions. Polyacetal slice models with different material properties were used to simulate the callus model during four growth states. Results: The results indicate that strain on the bone model increased and strain on the fixator parts decreased with maturation of the callus under axial, bending, and torsional loads. Although all curves showed a similar changing trend, they were slightly different under the three loads. Discussion and conclusions: This study provides a useful method to monitor the fracture healing process, and identifies the healing endpoint, detects healing status, and provides useful information for the orthopedist.

中文翻译：

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用实验和有限元方法研究外固定架与骨模型之间的载荷传递过程

简介：单侧外固定架在骨科中广泛用于稳定骨折和治疗肢体畸形。主要问题之一是难以检测愈合状态。此外，还没有研究在轴向、扭转和弯曲载荷下固定器和骨骼模型之间的载荷传递过程是否相同。方法：因此，本研究的主要目的是通过使用实验和有限元方法测量固定器 - 骨骼系统在四种愈合状态期间的应变来检测固定器和骨骼模型之间的负载转移过程。在实验方法中，使用 20 个应变片来测量固定器和骨骼模型在三种负载条件下的应变。使用具有不同材料特性的聚缩醛切片模型来模拟四种生长状态下的愈伤组织模型。结果：结果表明，随着骨痂在轴向、弯曲和扭转载荷下的成熟，骨模型的应变增加，固定器部分的应变减小。尽管所有曲线都表现出相似的变化趋势，但在三种载荷下它们略有不同。讨论与结论：本研究为监测骨折愈合过程、确定愈合终点、检测愈合状态提供了一种有用的方法，为骨科医生提供了有用的信息。尽管所有曲线都表现出相似的变化趋势，但在三种载荷下它们略有不同。讨论与结论：本研究为监测骨折愈合过程、确定愈合终点、检测愈合状态提供了一种有用的方法，为骨科医生提供了有用的信息。尽管所有曲线都表现出相似的变化趋势，但在三种载荷下它们略有不同。讨论与结论：本研究为监测骨折愈合过程、确定愈合终点、检测愈合状态提供了一种有用的方法，为骨科医生提供了有用的信息。