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Quantitative evaluation of abnormal finger movements in myelopathy hand during the grip and release test using gyro sensors

伊達翔太広島大学

2022.01.28

概要

Finger motion is often impaired in patients with cervical compressive myelopathy (CCM) [1].
The abnormal finger movements in patients with CCM are termed myelopathy hand [2], and
result in impaired extension of the ulnar two or three fingers and an inability to grip and
release rapidly [2]; however, these characteristics of myelopathy hand have not been assessed
quantitatively [3].
The grip and release test (GRT) can be used to evaluate myelopathy hand. The GRT counts
the number of times that an individual can make and release a fist in 10 seconds [2]. Previous
reports showed that patients with CCM achieve a reduced number of cycles during the GRT
[2, 4]. While the GRT is useful to evaluate myelopathy hand, it is subject to interobserver variability. Visual observation and manual counting could not guarantee the participants’ correct
finger movements, and so the results were not very accurate [3–5]. Additionally, several previous studies have reported that the number of times decreases with age [6, 7], suggesting that
the GRT is not specific for CCM or age. Therefore, the number of cycles in the GRT alone is
not sufficient to assess myelopathy hand and describe its characteristics. Patients with CCM
cannot open or close their fingers with maximum velocity [5] and cannot switch between finger flexion and extension quickly [8]. However, quantitative measures of kinematic parameters
such as peak finger velocity or time-delay to switch between finger flexion and extension have
not been previously reported. The quantitative measurement of these parameters can be
achieved using a small gyro sensor [9, 10]. The purpose of this study was to quantitatively evaluate the abnormal finger movements in patients with CCM and to understand the characteristics of myelopathy hand during the GRT using gyro sensors. ...

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Quantitative evaluation of abnormal finger movements in myelopathy hand during the grip and release test using gyro sensors

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