Figure legends
Figure 1. Ultrasound-guided injection image (left: short-axis injection;
right: long-axis injection). (a) The position of in-plane short-axis
injection at proximal inlet of the carpal tunnel. (b) The short-axis
view shows that the MN separated from the subsynovial connective tissue
(arrowheads) via hydrodissection (HD) (*: Injectate). (c) The short-axis
view shows that the MN was separated from the flexor retinaculum (FR)
(arrows) via HD (*). (d) The position of the in-plane long-axis
injection advancing from the wrist crease to the palm. (e) The long-axis
view shows swollen nerve fascicles, FR (arrows), and inflamed tendons in
the same plane. (f) The long-axis view shows that the MN separated from
the FR (arrows) via HD.
MN: median nerve; FDS: flexor digitorum superficialis; FDP: flexor
digitorum profundus.
Figure 2. Study flow diagram.
Figure 3. The mean scores of SSS and FSS in both groups at each
follow-up time point (mean ± standard error). The result showed a
significant reduction of SSS and FSS at 1 month post-injection between
groups (short-axis > long-axis group).
SSS = symptom severity scale; FSS = functional status scale
*p <0.05; Mann-Whitney U test.
Figure 4. Follow-up ultrasonography imaging after injection (left:
short-axis group; right: long-axis group). (a) The position of the
short-axis scan at the proximal inlet of the carpal tunnel. The
injectate (*) can be observed between the median nerve (MN), flexor
retinaculum (FR) (arrows), and subsynovial connective tissue (SSCT)
(arrowheads) in the short-axis scan (b) and long-axis scan (c). (d) The
position of the long-axis scan from the wrist crease to the palm. The
injectate (*) can be observed between the MN, FR (arrows), and SSCT
(arrowheads) in short-axis scan (e) and long-axis scan (f). Both, the
short- and long-axis scans show more injectate (*) between the MN and
SSCT in the short-axis group compared to the long-axis group.
MN: median nerve; SSCT: subsynovial connective tissue; FDS: flexor
digitorum superficialis.