Hehne H J, Soltész U, Desiderato R
Z Orthop Ihre Grenzgeb. 1985 Jan-Feb;123(1):27-34. doi: 10.1055/s-2008-1039716.
Previous pressure gauges have been unable to measure exactly the stress over the cross-section of fractures or osteotomies. This first became possible with the pressure sensitive foil. Known operative procedures were examined with this foil using a self-compressing plate and a synthetic tube model. Contact area, compressive force, pressure and pressure distribution were measured simultaneously and analogously. A straight plate produces extremely little force and pressure on the gap. Both are limited to about a quarter of the cross-section just below the plate. The consequence is no sufficient stability. Also, using a prebent plate results in inhomogeneous pressure distribution with high values, but a distinct decrease of the stress on the opposite side of the plate, especially by compression applied at the end of the plate. But compression from near the fracture side gives the highest values and a most homogeneous force distribution. In this case the force recorded 1700 N, the mean pressure 5,2 MPa and the contact 90% of the cross-section. The length thrust of the plate ends approximately at a torque of screw tightening at 1,0 Nm. Using torques up to 2,5 Nm, force and pressure increase isometrically. Higher torques have no influence. Converging screws result in smaller contact, force and pressure, because they produce a vector force away from the gap and a smaller length thrust.
以往的压力计无法精确测量骨折或截骨术横截面的应力。使用压敏箔才首次实现了这一点。用这种箔片通过自加压钢板和合成管模型对已知的手术操作进行了检查。同时类似地测量了接触面积、压缩力、压力和压力分布。直板在间隙上产生的力和压力极小。两者都仅限于直板下方约四分之一的横截面。结果是稳定性不足。此外，使用预弯钢板会导致压力分布不均匀且值较高，但钢板另一侧的应力明显降低，尤其是在钢板末端施加压缩力时。但是从骨折侧附近施加压缩力会产生最高值和最均匀的力分布。在这种情况下，记录的力为1700N，平均压力为5.2MPa，接触面积为横截面的90%。钢板末端的长度推力大约在拧紧螺钉的扭矩为1.0 Nm时结束。使用高达2.5 Nm的扭矩时，力和压力等比例增加。更高的扭矩没有影响。收敛螺钉会导致接触、力和压力变小，因为它们会产生远离间隙的矢量力和较小的长度推力。
