Smith D B, Fuhr A W, Davis B P
Activator Methods, Inc., Phoenix, Arizona 85060-0317.
J Manipulative Physiol Ther. 1989 Feb;12(1):26-37.
The authors studied relative bone movements in response to manipulative light taps to the spine. Piezoelectric accelerometers attached to bone of an anesthetized dog measured transverse, X-Z plane, movements of L2-L3 adjacent vertebrae while percussion thrusts of an instrument used for manipulation made inputs three vertebrae above and five vertebrae below the L2-L3 joint interface. Small, relative 1-mm translations and 0.5 degree rotations occurred during the first 19 msec. When one set of accelerometers were stabilized on the skin surface, half of the skin-bone translation maxima erred less than 2%. However, skin translations averaged 77% (SD = 2%) of bone translations and skin rotations averaged 95% (SD = 26%) of bone rotations. The results suggest the possibility that, with further development, piezoelectric accelerometers can be a noninvasive tool to study dynamic, relative, bone movement.
作者们研究了脊柱在接受轻柔手法敲击时的相对骨运动。将压电加速度计附着在一只麻醉犬的骨骼上，测量L2 - L3相邻椎体在横向（X - Z平面）的运动，同时使用用于手法操作的器械在L2 - L3关节界面上方三个椎体和下方五个椎体处进行冲击推力输入。在最初的19毫秒内发生了微小的、相对1毫米的平移和0.5度的旋转。当一组加速度计稳定在皮肤表面时，皮肤 - 骨骼平移最大值的一半误差小于2%。然而，皮肤平移平均为骨骼平移的77%（标准差 = 2%），皮肤旋转平均为骨骼旋转的95%（标准差 = 26%）。结果表明，随着进一步发展，压电加速度计有可能成为一种研究动态、相对骨运动的非侵入性工具。
