Pure unconstraint moments of 7.5 Nm in all anatomic planes with and without an axial preload of 500 N were applied to the upper vertebral body.

• 实验中我们在所有解剖学平面给予7.；5N的单纯非强迫运动的同时，同时伴或不伴在上一个椎体的给予了一个500N的轴向前负荷。