Gál J M, Herzog W, Kawchuk G N, Conway P J, Zhang Y T
Department of Pure and Applied Biology, University of Leeds, U.K.
J Manipulative Physiol Ther. 1995 Jan;18(1):4-9.
The purpose of this study was to compare the relative movements between adjacent vertebrae that were accompanied by a cavitation sound to those relative movements wherein no cavitation sound was recorded, during spinal manipulative treatments (SMTs) to T12 of an unembalmed human cadaver.
The experiment was conducted in the gross anatomy laboratory at the University of Calgary.
One 77-yr-old male cadaver was used.
High speed cinematography and embedded bone pin markers were used to record the movements of T10, T11, and T12, during the manipulations. A pressure pad was used to measure the posterior-to-anterior (p-to-a) forces exerted by the clinician onto the cadaver. Two uniaxial accelerometers were used to record the p-to-a accelerations of T11 and T12. The clinician delivered five p-to-a thrusts to the right transverse process of T12. P-to-a forces, p-to-a accelerations, and relative (between T10 and T11, and, T11 and T12) p-to-a translations, lateral translations, and axial rotations, were calculated for each thrust.
A cavitation sound was recorded by the T12 accelerometer during the fourth manipulation. The p-to-a force parameters of the fourth trial were not different from those of the other trials. However, the relative lateral translations between the adjacent vertebrae were substantially greater during the fourth manipulation, compared to the other trials.
The characteristics of the relative lateral translations between adjacent vertebrae suggest that the cavitation sound recorded during the fourth manipulation may have been associated with greater laterally applied forces than those during the other manipulations to T12, wherein no cavitation was recorded.
本研究旨在比较未经防腐处理的人体尸体T12椎体进行脊柱手法治疗（SMT）时，伴有气穴音的相邻椎体间相对运动与未记录到气穴音的相对运动。
实验在卡尔加里大学大体解剖实验室进行。
使用了一具77岁男性尸体。
在手法操作过程中，采用高速摄像和植入式骨针标记来记录T10、T11和T12的运动。使用压力垫测量临床医生施加于尸体的后向前（p-to-a）力。使用两个单轴加速度计记录T11和T12的后向前加速度。临床医生对T12右侧横突进行了五次后向前推力。计算每次推力的后向前力、后向前加速度以及（T10与T11之间、T11与T12之间）相对的后向前平移、侧向平移和轴向旋转。
在第四次手法操作期间，T12加速度计记录到气穴音。第四次试验的后向前力参数与其他试验无异。然而，与其他试验相比，第四次手法操作期间相邻椎体间的相对侧向平移显著更大。
相邻椎体间相对侧向平移的特征表明，第四次手法操作期间记录到的气穴音可能与比其他未记录到气穴音的T12手法操作更大的侧向作用力有关。
