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Sonographic morphometry of abductor pollicis brevis: can direct contact yield images comparable with those obtained by the water bath technique?

  • Original Article—Orthopedics
  • Published:
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Abstract

Purpose

This study sought to compare ultrasound-guided measurements of the abductor pollicis brevis (APB) using the water bath technique (WBT) and the direct contact method (DM) and investigate whether the DM can reproduce the measurements that would be obtained with a non-contact method, such as the WBT.

Methods

The APB muscles of 80 hands (40 healthy adults) were measured. The WBT was performed in a plastic container filled with water. The probe was placed adjacent to the skin surface without contact. In the DM, sonographic images were obtained with the probe and skin separated by sufficient transmission gel. The muscle thickness and cross-sectional area (CSA) were calculated with both methods. All subjects were examined three times by two examiners to estimate the inter- and intra-observer reliability. Bland–Altman analysis was performed to examine the agreement between the methods.

Results

No significant differences in the thickness or CSA of the APB were found. The interclass correlation coefficients for the WBT and DM showed almost perfect intra- and inter-observer reliability (range 0.87–0.94). There was no systematic bias between the techniques in the Bland–Altman analysis.

Conclusion

Similar to the WBT, the DM provides measurements of the APB thickness and CSA without causing morphometric changes.

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Acknowledgements

We thank Rebecca Jackson, PhD, from Edanz Group (www.edanzediting.com/ac) for editing a draft of this manuscript.

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Authors and Affiliations

  1. Department of Orthopedic Surgery, Osaka Medical College, 2-7 Daigakumachi, Takatsuki, 569-8686, Osaka, Japan

    Keitaro Fujino, Katsunori Ohno, Kenta Fujiwara, Atsushi Yokota & Masashi Neo

Authors
  1. Keitaro Fujino
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  2. Katsunori Ohno
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  3. Kenta Fujiwara
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  4. Atsushi Yokota
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  5. Masashi Neo
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Corresponding author

Correspondence to Katsunori Ohno.

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The authors have no conflicts of interest with regard to the presented research.

Ethical approval

All procedures followed were in accordance with the ethical standards of the responsible committee on human experimentation (institutional and national) and with the Helsinki Declaration of 1964 and later versions.

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Fujino, K., Ohno, K., Fujiwara, K. et al. Sonographic morphometry of abductor pollicis brevis: can direct contact yield images comparable with those obtained by the water bath technique?. J Med Ultrasonics 46, 489–495 (2019). https://doi.org/10.1007/s10396-019-00945-3

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  • DOI: https://doi.org/10.1007/s10396-019-00945-3

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