Test-Retest Reliability of 3D Ultrasound Measurements of the Thoracic Spine

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• 作者：Christian Fö ; lsch ; MD^a ; Stefanie Schlö ; gel^b ; Stefan Lakemeier ; MD^c ; ^{stefan.lakemeier@med.uni-goettingen.de} ; Udo Wolf ; MSc^d ; Nina Timmesfeld^e ; Adrian Skwara ; MD^f
• 刊名：PM&R
• 出版年：2012
• 期刊代码：pca283_19341482
• 类别：med
• 出版时间：May, 2012
• 卷：4
• 期：5
• 页码：335-341
• 文件大小：500 K

摘要

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Objective

To explore the reliability of the Zebris CMS 20 ultrasound analysis system with pointer application for measuring end-range flexion, end-range extension, and neutral kyphosis angle of the thoracic spine.

Setting

The study was performed within the School of Physiotherapy in cooperation with the Orthopedic Department at a University Hospital.

Participants

The thoracic spines of 28 healthy subjects were measured.

Methods

Measurements for neutral kyphosis angle, end-range flexion, and end-range extension were taken once at each time point. The bone landmarks were palpated by one examiner and marked with a pointer containing 2 transmitters using a frequency of 40 kHz. A third transmitter was fixed to the pelvis, and 3 microphones were used as receiver. The real angle was calculated by the software. Bland-Altman plots with 95%limits of agreement, intraclass correlations (ICC), standard deviations of mean measurements, and standard error of measurements were used for statistical analyses. The test-retest reliability in this study was measured within a 24-hour interval.

Main Outcome Measurements

Statistical parameters were used to judge reliability.

Results

The mean kyphosis angle was 44.8掳 with a standard deviation of 17.3掳 at the first measurement and a mean of 45.8掳 with a standard deviation of 16.2掳 the following day. The ICC was high at 0.95 for the neutral kyphosis angle, and the Bland-Altman 95%limits of agreement were within clinical acceptable margins. The ICC was 0.71 for end-range flexion and 0.34 for end-range extension, whereas the Bland-Altman 95%limits of agreement were wider than with the static measurement of kyphosis. Compared with static measurements, the analysis of motion with 3-dimensional ultrasound showed an increased standard deviation for test-retest measurements.

Conclusions

The test-retest reliability of ultrasound measuring of the neutral kyphosis angle of the thoracic spine was demonstrated within 24 hours. Bland-Altman 95%limits of agreement and the standard deviation of differences did not appear to be clinically acceptable for measuring flexion and extension.