Julius Wolff Institut, Charité-Universitätsmedizin Berlin, Augustenburger Platz 1, 13353, Berlin, Germany.
Eur Spine J. 2010 Jul;19(7):1129-35. doi: 10.1007/s00586-010-1346-5. Epub 2010 Feb 27.
After spinal surgery, patients often want to know whether driving a car or using public transportation can be dangerous for their spine. In order to answer this question, a clinically proven vertebral body replacement (VBR) has been modified. Six load sensors and a telemetry unit were integrated into the inductively powered implant. The modified implant allows the measurement of six load components. Telemeterized devices were implanted in five patients; four of them agreed to exposure themselves to whole-body vibration. During the measurements, the patients sat on a driver seat fixed to a hexapod. They were exposed to random single-axis vibrations in X, Y, and Z directions as well as in multi-axis XYZ directions with frequencies between 0.3 and 30 Hz. Three intensity levels (unweighted root mean square values of 0.25, 0.5 and 1.0 m/s(2)) were applied. Three postures were studied: sitting freely, using a vertical backrest, and a backrest declined by an angle of 25 degrees . The patients held their hands on their thighs. As expected, the maximum force on the VBR increased with increasing intensity and the number of axes. For the highest intensity level and multi-axis vibration, the maximum forces increased by 89% compared to sitting relaxed. Leaning at the backrest as well as lower intensity levels markedly decreased the implant loads. Driving a car or using public transportation systems-when the patient leans towards the backrest-leads to lower implant loads than walking, and can therefore be allowed already shortly after surgery.
脊柱手术后，患者常常想知道开车或乘坐公共交通工具是否对脊柱有危险。为了回答这个问题，一种经过临床验证的椎体置换（VBR）已被改良。六个负载传感器和一个遥测单元被集成到感应供电的植入物中。改良后的植入物允许测量六个负载分量。五个患者被植入遥测设备；其中四人同意暴露在全身振动下。在测量过程中，患者坐在固定在六足架上的驾驶座上。他们暴露在 X、Y 和 Z 方向的随机单轴振动以及 0.3 至 30 Hz 之间的多轴 XYZ 方向的振动中。应用了三个强度水平（未加权均方根值为 0.25、0.5 和 1.0 m/s²）。研究了三种姿势：自由坐姿、使用垂直靠背和靠背倾斜 25 度。患者将手放在大腿上。正如预期的那样，VBR 上的最大力随着强度和轴数的增加而增加。对于最高强度水平和多轴振动，与放松坐姿相比，最大力增加了 89%。靠背倾斜以及较低的强度水平显著降低了植入物的负载。开车或使用公共交通系统——当患者靠在靠背上时——导致植入物的负载低于步行，因此可以在手术后不久就允许进行。
