Loads acting in an intramedullary nail during fracture healing in the human femur
Loads acting in an intramedullary nail during fracture healing in the human femur
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DOI：
10.1016/s0021-9290(01)00037-9
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发表时间：
2001-07-01
影响因子：
2.4
通讯作者：
Perren, SM
中科院分区：
文献类型：
--
作者：
Schneider, E;Michel, MC;Perren, SM
肌肉骨骼系统的形式和功能与其组成部分的作用力密切相关。在孤独的骨骼中存在着重要的力量，但到目前为止，它们的大小只能从数学模型中估计出来。通过金属植入物进行骨折固定提供了测量植入物受力和估计愈合前长骨受力的机会。骨折愈合期间的载荷变化可提供额外信息。因此，开发了一种遥测的交锁股骨髓内钉，用于无线传输作用于骨折部位的力和力矩。该设计基于16 mm AO髓内钉的几何形状和材料，具有圆形闭合横截面，可完全保护电子电路免受体液影响。经过仔细测试后，将其植入一名33岁的左股骨多段骨折患者体内。以大约100%的速率进行测量。0.4在术后第2周和第26周之间，在不同的患者姿势下进行Hz。显著的轴向力和弯曲力矩在几个活动，如坐，无支撑的腿抬高和站立位置的部分重量轴承。与髓内钉轴垂直的力仍然很小。由于骨折合并，植入物载荷减少约50%。髓内钉的动力化也不会改变力。尽管遥测系统不允许进行动态测量，并且此处提供的结果仅提供了一名受试者的数据，但新信息对于植入物设计、骨折固定的生物力学和愈合进展的评价将是有用的。(C)2001爱思唯尔科技有限公司版权所有。
The form and function of the musculo-skeletal system is closely related to the forces acting in its components. Significant forces are present in the lone bones, but their magnitudes have so far only been estimated from mathematical models. Fracture fixation by means of metal implants provides an opportunity to measure the: implant-born forces and to estimate the long bone forces before healing occurs. The load changes during fracture healing may provide additional information. Therefore, a telemetrized, interlocking femoral nail for wireless transmission of forces and moments acting across the fracture site was developed. The design was based on the geometry and material of a 16 mm AO nail with a circular, closed cross-section allowing full protection of the electronic circuits From the body fluids. After careful testing, it was implanted in a 33-year-old patient who had sustained a multifragmentary Fracture of the left Femur. Measurements at a rate of approx. 0.4 Hz were performed in different patient postures between the 2nd and 26th postoperative week. Significant axial forces and bending moments were measured during several activities such as sitting, unsupported leg elevation and partial weight bearing in a standing position. Forces orthogonal to the nail axis remained small. The reductions of the implant loads due to fracture consolidation were in the order of 50%. Dynamization of the nail did nor change the forces. Even though the telemetry system did not allow for dynamic measurements and the results presented here provide data From one subject only, the new information will be useful with respect to implant design, biomechanics of fracture fixation and evaluation of healing progression. (C) 2001 Elsevier Science Ltd. All rights reserved.