Low back pain is a common, expensive, and disabling condition in industrialized countries. There is still no consensus for its ideal management. Believing in the beneficial effect of traction, we developed a novel external dynamic distraction device. The purpose of this work was to demonstrate that external distraction allows limiting the pressure exerted in standing-up position on the lower intervertebral discs. Numerical and cadaveric studies were used as complementary approaches. Firstly, we implemented the device into a numerical model of a validated musculoskeletal software (Anybody Modeling System) and we calculated the lower disc pressure while traction forces were applied. Secondly, we performed an anatomical study using a non-formalin preserved cadaver placed in a sitting position. A pressure sensor was placed in the lower discs under fluoroscopic control through a Jamshidi needle. The intradiscal pressure was then measured continuously at rest while applying a traction force of 200 N. Both numerical and cadaveric studies demonstrated a decrease in intradiscal pressures after applying a traction force with the external device. Using the numerical model, we showed that tensile forces below 500 N in total were sufficient. The application of higher forces seems useless and potentially deleterious. External dynamic distraction device is able to significantly decrease the intradiscal pressure in a sitting or standing position. However, the therapeutic effects need to be proven using clinical studies.

在工业化国家，腰痛是一种常见、昂贵且致残的病症。对于其理想的管理，目前还没有达成共识。相信牵引的有益效果，我们开发了一种新颖的外部动态牵引装置。这项工作的目的是证明外部牵引可以限制在站立位置施加在下椎间盘上的压力。数值和尸体研究被用作补充方法。首先，我们将该设备实施到经过验证的肌肉骨骼软件（Anybody Modeling System）的数值模型中，并计算了施加牵引力时的较低椎间盘压力。其次，我们使用放置在坐姿的非福尔马林保存的尸体进行了解剖学研究。压力传感器通过 Jamshidi 针放置在荧光镜控制下的下椎间盘中。然后在静止状态下连续测量椎间盘内压力，同时施加 200 N 的牵引力。数值和尸体研究均表明，在使用外部装置施加牵引力后，椎间盘内压力会降低。使用数值模型，我们表明总拉力低于 500 N 就足够了。施加更高的力似乎无用且可能有害。外部动态牵引装置能够显着降低坐位或站立位的椎间盘内压力。然而，治疗效果需要通过临床研究来证明。然后在静止状态下连续测量椎间盘内压力，同时施加 200 N 的牵引力。数值和尸体研究均表明，在使用外部装置施加牵引力后，椎间盘内压力会降低。使用数值模型，我们表明总拉力低于 500 N 就足够了。施加更高的力似乎无用且可能有害。外部动态牵引装置能够显着降低坐位或站立位的椎间盘内压力。然而，治疗效果需要通过临床研究来证明。然后在静止状态下连续测量椎间盘内压力，同时施加 200 N 的牵引力。数值和尸体研究均表明，在使用外部装置施加牵引力后，椎间盘内压力会降低。使用数值模型，我们表明总拉力低于 500 N 就足够了。施加更高的力似乎无用且可能有害。外部动态牵引装置能够显着降低坐位或站立位的椎间盘内压力。然而，治疗效果需要通过临床研究来证明。我们表明，总拉力低于 500 N 就足够了。施加更高的力似乎无用且可能有害。外部动态牵引装置能够显着降低坐位或站立位的椎间盘内压力。然而，治疗效果需要通过临床研究来证明。我们表明，总拉力低于 500 N 就足够了。施加更高的力似乎无用且可能有害。外部动态牵引装置能够显着降低坐位或站立位的椎间盘内压力。然而，治疗效果需要通过临床研究来证明。