Comparison between tripod and skin-fixed recording of scapular motion

被引:93
|
作者
Meskers, Carel G. M.
van de Sande, Michiel A. J.
de Groot, Jurriaan H.
机构
[1] Leiden Univ, Med Ctr, Dept Rehabil Med, Lab Mot Anal, NL-2300 RC Leiden, Netherlands
[2] Leiden Univ, Med Ctr, Dept Orthopaed Surg, Lab Mot Anal, NL-2300 RC Leiden, Netherlands
关键词
shoulder; scapula; kinematics; electromagnetic tracking; tripod; skin-fixed receiver;
D O I
10.1016/j.jbiomech.2006.02.011
中图分类号
Q6 [生物物理学];
学科分类号
071011 ;
摘要
Non-invasive dynamical measurements of 3D scapular motion can be performed easily by attachment of a 6 DOF electromagnetic receiver onto the skin above the acromion. To quantify the introduction of possible errors due to skin displacement, we assessed 3D scapular positions on n = 8 subjects by both tripod and skin-fixed method. Error analysis included the variables method (tripod, skin-fixed simultaneously with tripod, separate skin-fixed at 0 and 0.25 Hz of elevation speed), plane of elevation (0 degrees and 90 degrees) and observation (receiver replacement: it = 3). Inter-individual 'group' differences depended on elevation plane and showed an average underestimation of scapular rotation of 6.5 degrees (worst case 13 degrees) using the skin-fixed method. Only the group RMSE, not the individual RMSE, could be successfully lowered using linear regression (to about 2 degrees). Inter-trial reliability (RMSE < 3.24 degrees, ICC > 0.94) and RMSE between 0 and 0.25 Hz recordings (about 2.5 degrees) were satisfactory. Intra-observer RMSE after replacement of the skin-fixed receiver was 5 degrees. The skin-fixed method is suitable for dynamic recordings of scapular rotations; however, measurements are precise only when the acromion receiver is not replaced. Combined with a relatively low accuracy, we conclude that the skin-fixed method should be used only in combination with tripod 'calibration'. (c) 2006 Elsevier Ltd. All rights reserved.
引用
收藏
页码:941 / 946
页数:6
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