Latimer J, Holland M, Lee M, Adams R
School of Physiotherapy, Faculty of Health Sciences, University of Sydney, Australia.
J Manipulative Physiol Ther. 1997 Jun;20(5):315-9.
To investigate whether measurement of posteroanterior (PA) lumbar stiffness is affected by the presence of padding on the testing plinth.
Within a repeated-measures design, measurements were made of lumbar PA stiffness in subjects without low back pain on both a rigid and a padded plinth surface.
Nineteen subjects with no history of any low back pain requiring treatment over the preceding 12 months participated in this study.
PA stiffness was measured at L3 on two occasions under two different conditions. The first condition involved measurement of lumbar stiffness on a rigid plinth surface; the second involved measurement on a padded plinth surface. A reliable mechanical device was used to obtain the PA stiffness measures.
Mean lumbar PA stiffness values obtained when testing on a padded plinth were 2.86 N/mm less than those values obtained when testing the same lumbar spines on a rigid plinth. A paired t test showed a significant difference between the PA stiffness measures at L3 obtained on the padded plinth and those obtained on the rigid plinth (t = 6.66, df = 18, p < or = .0001).
These findings suggest that to improve the reliability of lumbar PA stiffness assessment, testing should be performed under the same plinth surface conditions.
探讨测试台面上的衬垫是否会影响腰椎前后位（PA）刚度的测量。
在重复测量设计中，对无下腰痛的受试者在刚性和有衬垫的台面表面测量腰椎PA刚度。
19名在过去12个月内无任何需要治疗的下腰痛病史的受试者参与了本研究。
在两种不同条件下，分两次测量L3水平的PA刚度。第一种情况是在刚性台面表面测量腰椎刚度；第二种情况是在有衬垫的台面表面测量。使用可靠的机械设备获取PA刚度测量值。
在有衬垫的台面上进行测试时获得的平均腰椎PA刚度值比在刚性台面上测试相同腰椎时获得的值小2.86N/mm。配对t检验显示，在有衬垫的台面上获得的L3水平的PA刚度测量值与在刚性台面上获得的测量值之间存在显著差异（t = 6.66，自由度 = 18，p≤0.0001）。
这些发现表明，为提高腰椎PA刚度评估的可靠性，应在相同的台面表面条件下进行测试。
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