Effect of metacarpophalangeal joint position on a1 pulley and flexor digitorum tendons in trigger digit

Tung Tai Wu, Po Ting Wu, Su Ya Lee, Kuo Chen Wu, Chung Jung Shao, Tai Chang Chern, Fong Chin Su, I. Ming Jou

Research output: Contribution to journalArticle

Abstract

Background: The aim of this study was to evaluate and compare the cross-sectional area (CSA) of flexor digitorum tendons and the thickness of first annular (A1) pulleys between contralateral normal digits and trigger digits (TDs) at positions of finger flexion and extension using a noninvasive ultrasound system. Methods: Seventeen affected fingers of 17 patients (6 men and 11 women) with TDs in one hand, and 17 contralateral normal digits without trigger finger symptoms were examined. The sonographic appearances of flexor digitorum tendons and A1 pulleys were observed at two positions of metacarpophalangeal (MCP) joint flexion: 0° and 60°. Results: The findings of this study indicate that CSA of flexor digitorum tendons and A1 pulley thickness were significantly larger in both positions of 0° and 60° flexion of MCP joint compared with contralateral normal digits (p < 0.01). In TDs, there was a significantly thicker A1 pulley at 60° flexion of MCP joint than that at 0° flexion (p < 0.01), but no significant change on CSA of flexor tendons. Conclusion: Our results suggested that TDs lead to the thicker A1 pulley and larger CSA of the flexor digitorum tendons. The mismatch in volume change between CSA of flexor digitorum tendons and A1 pulley thickness during MCP flexion may lead to the trigger phenomenon.

Original languageEnglish
Pages (from-to)778-781
Number of pages4
JournalJournal of the Chinese Medical Association
Volume82
Issue number10
DOIs
Publication statusPublished - 2019 Jan 1

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Trigger Finger Disorder
Metacarpophalangeal Joint
Tendons
Fingers
Hand
Cross-Sectional Studies

All Science Journal Classification (ASJC) codes

  • Medicine(all)

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Wu, Tung Tai ; Wu, Po Ting ; Lee, Su Ya ; Wu, Kuo Chen ; Shao, Chung Jung ; Chern, Tai Chang ; Su, Fong Chin ; Jou, I. Ming. / Effect of metacarpophalangeal joint position on a1 pulley and flexor digitorum tendons in trigger digit. In: Journal of the Chinese Medical Association. 2019 ; Vol. 82, No. 10. pp. 778-781.
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Effect of metacarpophalangeal joint position on a1 pulley and flexor digitorum tendons in trigger digit. / Wu, Tung Tai; Wu, Po Ting; Lee, Su Ya; Wu, Kuo Chen; Shao, Chung Jung; Chern, Tai Chang; Su, Fong Chin; Jou, I. Ming.

In: Journal of the Chinese Medical Association, Vol. 82, No. 10, 01.01.2019, p. 778-781.

Research output: Contribution to journalArticle

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T1 - Effect of metacarpophalangeal joint position on a1 pulley and flexor digitorum tendons in trigger digit

AU - Wu, Tung Tai

AU - Wu, Po Ting

AU - Lee, Su Ya

AU - Wu, Kuo Chen

AU - Shao, Chung Jung

AU - Chern, Tai Chang

AU - Su, Fong Chin

AU - Jou, I. Ming

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