Detecting Median Nerve Strain Changes with Cyclic Compression Apparatus: A Comparison of Carpal Tunnel Syndrome Patients and Healthy Controls

Yoshii, Yukie; Ishii, Tomoo; Tanaka, Toshikazu; Tung, Wen-Lin; Sakai, Shinsuke

doi:10.1016/j.ultrasmedbio.2014.09.020

Cited by 22 publications

(20 citation statements)

References 21 publications

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“…This apparatus was developed to apply compression to the tissue with a predetermined cycle and displacement of the transducer. The details of the apparatus have been described previously . Each participant was asked to sit and place his or her forearm on a table with the palm facing up, and the forearm was secured to the table.…”

Section: Methodsmentioning

confidence: 99%

“…As a result of recent advances in increasing the resolution of sonography, it has become possible to evaluate these changes using ultrasound . In addition, it has been shown that sonographic strain measurement of the median nerve is useful for diagnosing CTS . The principal advantages of ultrasound are its low cost, short study time, noninvasiveness, immediacy, and dynamic imaging.…”

mentioning

confidence: 99%

“…In a previous study, we established a method to measure median nerve strain and morphology using a cyclic compression apparatus at the same level of the proximal carpal tunnel . It was found that CTS patients had lower strains and larger areas of the median nerve than healthy subjects.…”

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confidence: 99%

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Strain and Morphological Changes of Median Nerve After Carpal Tunnel Release

2017

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Section: Methodsmentioning

confidence: 99%

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confidence: 99%

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Strain and Morphological Changes of Median Nerve After Carpal Tunnel Release

2017

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“…In our previous studies, we tried to develop quantitative methods to measure strain of the tissues. It was found the ultrasonic strain measurements of the median nerve were superior to morphologic assessment in diagnosing CTS [27]. During the process, it was noticed applied pressure had also important factor to measure strain of the tissues.…”

Section: Discussionmentioning

confidence: 99%

Postoperative diagnostic potentials of median nerve strain and applied pressure measurement after carpal tunnel release

Yoshii

Tung

Yuine

et al. 2020

BMC Musculoskelet Disord

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Bakground: The objective of this study is to investigate the prognostic values of median nerve strain and applied pressure measurement for the assessment of clinical recovery after carpal tunnel release. Methods: Forty-five wrists, from 45 idiopathic carpal tunnel syndrome patients who treated with open carpal tunnel release, were evaluated by ultrasound. Median nerve strain, pressure applied to the skin, and ratio of pressure-strain were measured at the proximal part of the carpal tunnel. In addition, distal latencies in the motor and sensory nerve conductions studies and cross-sectional area of median nerve were measured. The parameters were compared before and after the open carpal tunnel release. According to patient recovery, the receiver operating characteristic curves were generated to evaluate the prognostic values of the parameters. The areas under the receiver operating characteristic curves were compared among parameters. Results: There was a significant increase in the median nerve strain, and significant decreases in the pressure applied to the skin and ratio of pressure-strain after carpal tunnel release (P < 0.01). There were significant decreases in the distal latencies and the cross-sectional area after carpal tunnel release (P < 0.01). The areas under the curves were 0.689, 0.773, 0.811, 0.668, 0.637, and 0.562 for the pressure, strain, pressure-strain ratio, motor latency, sensory latency, and area, respectively. Conclusions: The results suggest that elasticity of the median nerve and pressure around the nerve recover quickly after carpal tunnel release. Pressure-strain ratio was the most reliable parameter to reflect clinical recovery. The measurement of strain and applied pressure can be useful indicators to evaluate effectiveness of the carpal tunnel release. Trial registration: Registered as NCT04027998 at ClinicalTrials.gov. Retrospectively registered on July 22, 2019.

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“…Previous publications have described the potential of elastography for CTS, with the majority reporting increased nerve stiffness (ratios) in patients with CTS 20–32 ; three research studies reported no significant difference 33–35 . In addition, US elastography has been used to assess carpal ligament stiffness, 36,37 intra carpal tunnel pressure, 38,39 the correlation between median nerve area and strain 40 and the difference in median nerve elasticity before and after carpal tunnel release 41 .…”

Section: Introductionmentioning

confidence: 99%

Shear wave elastography of the median nerve: A mechanical study

et al. 2020

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Background: Shear wave elastography (SWE) shows promise in peripheral neuropathy evaluation but has potential limitations due to tissue size and heterogeneity. We tested SWE sensitivity to elasticity change and the effect of probe position in a median nerve cadaver model. Methods: Ten specimens were used to measure median nerve elasticity under increasing loads using SWE and indentation. Measurements were compared using repeated-measures analysis of variance. Results: Indentation and SWE-based longitudinal nerve elasticity increased with tensile loading (P < .01), showing a similar relationship. Acquisition in a transverse plane showed lower values compared with longitudinal measurements, mostly under higher loads (P = .03), as did postdissection elasticity (P = .02). Elasticity did not change when measured proximal to the carpal tunnel. Conclusions: Longitudinal SWE is sensitive to changes in median nerve elasticity. Measuring elasticity of peripheral nerves noninvasively could elucidate intra-neural pathology related to compression neuropathies, and proof to be of added value as a diagnostic or prognostic tool. K E Y W O R D S carpal tunnel syndrome, elastography, nerve elasticity, neurodynamics, peripheral neuropathy

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Detecting Median Nerve Strain Changes with Cyclic Compression Apparatus: A Comparison of Carpal Tunnel Syndrome Patients and Healthy Controls

Cited by 22 publications

References 21 publications

Strain and Morphological Changes of Median Nerve After Carpal Tunnel Release

Strain and Morphological Changes of Median Nerve After Carpal Tunnel Release

Postoperative diagnostic potentials of median nerve strain and applied pressure measurement after carpal tunnel release

Shear wave elastography of the median nerve: A mechanical study

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