gms | German Medical Science

14th Triennial Congress of the International Federation of Societies for Surgery of the Hand (IFSSH), 11th Triennial Congress of the International Federation of Societies for Hand Therapy (IFSHT)

17.06. - 21.06.2019, Berlin

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Effect of Wrist Ulnar Deviation Isometric Motion on Triquetrum Stability

Meeting Abstract

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  • presenting/speaker Chihiro Fujime - Graduate School of Niigata University of Health and Welfare, Niigata, Japan
  • Mineo Oyama - Graduate School of Niigata University of Health and Welfare, Niigata, Japan
  • Yoshiaki Hada - Sonodakai Rehabilitation Hospital, Tokyo, Germany

International Federation of Societies for Surgery of the Hand. International Federation of Societies for Hand Therapy. 14th Triennial Congress of the International Federation of Societies for Surgery of the Hand (IFSSH), 11th Triennial Congress of the International Federation of Societies for Hand Therapy (IFSHT), 11th Triennial Congress of the International Federation of Societies for Hand Therapy (IFSHT). Berlin, 17.-21.06.2019. Düsseldorf: German Medical Science GMS Publishing House; 2020. DocIFSHT19-1290

doi: 10.3205/19ifssh1556, urn:nbn:de:0183-19ifssh15565

Published: February 6, 2020

© 2020 Fujime et al.
This is an Open Access article distributed under the terms of the Creative Commons Attribution 4.0 License. See license information at http://creativecommons.org/licenses/by/4.0/.

Outline

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Objective: The first treating for triangular fibrocartilage complex (TFCC) injury is conservative treatment by splinting for the wrist. However some cases the treatment is not successful. Injury site and severity that affects therapeutic effect has been studied but not been sufficiently clarified effect of the splinting. The purpose of this study is that the isometric motion in the state of fixing the wrist joint is to investigate the influence on the triquetrum (Tq) stability.

Materials and Methods: In this experiment 6 health volunteers participated. They all signed an informed consent form. The experimental task was ulnar deviation isometric motion of the right wrist joint during 30% MVC. The position of the wrist and forearm during the measurement was fixed at the neutral position. The Tq movement was assessed with ultrasonography (14 MHz liner array probe) and measurements were taken offline from the 5th metacarpal bone base to the ulnar head at ulnar side. The depth from the skin surface to the Tq ulnar surface (STD) was measured during experimental task and at rest. Differences in mean between the 2 conditions were compared using Student test.

And, the muscle activity of the ECU and the FCU during experiment task was recorded using the surface electromyography. Full wave rectification and integration was performed every 200 ms. The integrated EMG values were normalized by converting them to a percent of the maximum voluntary contraction recorded during manual muscle testing for each subject (NIEMG).

Results: The STD of the rest was 3.41±0.49 mm and isometric motion was 2.96±0.36 mm. The isometric motion was significantly superficially than the rest (P<0.05). The Tq tended to shift toward to the dorsal and ulnar side by isometric motion. The NIEMG of the ECU was about 30% and the FCU about 5%.

Conclusions: The result of this study suggested that the ulnar deviation isometric motion was bring instability for Tq. And it suggests that ECU muscle activity is involved. The splinting for TFCC injury is a need to hold the Tq.