McGlashen K, Ashton-Miller J A, Green M, Schultz A B
Department of Mechanical Engineering and Applied Mechanics, University of Michigan, Ann Arbor 48109-2125.
J Orthop Res. 1991 Jul;9(4):576-83. doi: 10.1002/jor.1100090414.
The accuracy with which the head and spine could be positioned in the frontal and sagittal planes relative to the pelvis was measured and compared in ten healthy adult males. Subjects were tested with eyes closed, while standing with their pelvis externally restrained. The positions of markers, attached to the back of the head and over each of the T1, T6, T11, and L3 spinous processes, were measured to the nearest mm using strain-gaged flexible beam transducers. Subjects were tested for their accuracy in sensing return of the trunk to an initial neutral position under different test conditions. Results showed that positioning was 16-45% more accurate in the frontal than in the sagittal plane, although the difference did not reach statistical significance. T1 could be centered to within 7 and 10 mm in the frontal and sagittal planes, respectively. No significant differences were found between active and passive positioning accuracies. Presence of an external trunk moment did not significantly affect trunk positioning accuracy, although it systematically caused overshoot of the neutral position. Lastly, lateral trunk shifts exceeding 12 mm may be classified as abnormal in young adults.
在十名健康成年男性中测量并比较了头部和脊柱相对于骨盆在额状面和矢状面定位的准确性。受试者闭眼进行测试，站立时骨盆受到外部约束。使用应变计柔性梁传感器测量附着在头部后部以及T1、T6、T11和L3每个棘突上的标记位置，精确到毫米。测试了受试者在不同测试条件下感知躯干回到初始中立位置的准确性。结果表明，尽管差异未达到统计学显著性，但在额状面的定位比矢状面准确16%-45%。T1在额状面和矢状面分别可以精确到7毫米和10毫米以内。主动和被动定位准确性之间未发现显著差异。尽管外部躯干力矩会系统性地导致中立位置超调，但它对躯干定位准确性没有显著影响。最后，在年轻人中，超过12毫米的躯干侧移可能被归类为异常。
