2017
DOI: 10.1177/0284185117690422
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Distally extended muscle belly of the flexor digitorum within the carpal tunnel: is it a risk factor for carpal tunnel syndrome?

Abstract: Background The distally extended muscle belly of the flexor digitorum (MB-FD) within the carpal tunnel has been suggested as a plausible cause for carpal tunnel syndrome (CTS) based on cadaveric studies. Purpose To evaluate whether MB-FD within the carpal tunnel is a risk factor for CTS by comparing asymptomatic volunteers and patients with CTS. Material and Methods Presence, length, and cross-sectional area of MB-FD within the carpal tunnel were evaluated in 63 wrists of 32 asymptomatic volunteers and 52 wris… Show more

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Cited by 8 publications
(9 citation statements)
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“…Specifically, case reports suggesting a link between aberrant flexor or lumbrical muscle bellies and carpal tunnel syndrome have been reported in the literature for more than 50 years. [12][13][14][15][16][17][18][19][20][21] The continuous presence of muscle belly in the carpal tunnel even while the hand is at rest may compromise the available space within the tunnel. This loss of space may compress the median nerve, which can lead to the development of carpal tunnel syndrome.…”
Section: Discussionmentioning
confidence: 99%
See 2 more Smart Citations
“…Specifically, case reports suggesting a link between aberrant flexor or lumbrical muscle bellies and carpal tunnel syndrome have been reported in the literature for more than 50 years. [12][13][14][15][16][17][18][19][20][21] The continuous presence of muscle belly in the carpal tunnel even while the hand is at rest may compromise the available space within the tunnel. This loss of space may compress the median nerve, which can lead to the development of carpal tunnel syndrome.…”
Section: Discussionmentioning
confidence: 99%
“…This loss of space may compress the median nerve, which can lead to the development of carpal tunnel syndrome. 21,22 Although individuals with aberrant muscle bellies may be at increased risk for developing carpal tunnel syndrome, prospective or large-scale studies have not been conducted to establish any causative link.…”
Section: Discussionmentioning
confidence: 99%
See 1 more Smart Citation
“…Compression of the MN by an AM located inside the CT 11 is usually related to anomalous proximal extensions of the lumbricals, 12 anatomic variations of the palmaris longus, [13][14][15] and an anomalous distal extension of the flexor digitorum superficialis. 16 Ultrasound shows an AM as a solid hypoechoic structure with a typical muscle echo texture and absence of blood flow on color Doppler imaging. A dynamic examination with finger flexion and extension is important to show the AM moving inside and outside the CT depending on the finger position ( Figure 1).…”
Section: Congenital Causesmentioning
confidence: 99%
“…Accessory muscles (AM) are common anatomic variations that are often asymptomatic. Compression of the MN by an AM located inside the CT 11 is usually related to anomalous proximal extensions of the lumbricals, 12 anatomic variations of the palmaris longus, 13‐15 and an anomalous distal extension of the flexor digitorum superficialis 16 . Ultrasound shows an AM as a solid hypoechoic structure with a typical muscle echo texture and absence of blood flow on color Doppler imaging.…”
Section: Congenital Causesmentioning
confidence: 99%