Journal Article

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

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

2019

Overview

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.

• Publisher: Springer Singapore,Springer,Springer Nature B.V
• Subject: Adult / Algorithms / Carpal tunnel syndrome / Confidence intervals / Correlation coefficients / Female / Fingers & toes / Hand - diagnostic imaging / Humans / Imaging / Male / Medicine / Medicine & Public Health / Methods / Middle Aged / Muscle, Skeletal - diagnostic imaging / Muscle, Skeletal - physiology / Muscles / Original Article—Orthopedics / Plastic containers / Radiology / Reliability analysis / Reproducibility of Results / Skin / Statistical analysis / Thickness / Ultrasonic imaging / Ultrasonography - methods / Ultrasound / Water / Water baths / Young Adult