Optimal placement of needle electromyography in extensor indicis

A cadaveric study

Jin Young Im, Hong Bum Park, Seok Jun Lee, Seong Gyu Lim, Ki Hoon Kim, Dasom Kim, Im Joo Rhyu, Byung Kyu Park, Dong Hwee Kim

Research output: Contribution to journalArticle

Abstract

Objective To identify the center of extensor indicis (EI) muscle through cadaver dissection and compare the accuracy of different techniques for needle electromyography (EMG) electrode insertion. Methods Eighteen upper limbs of 10 adult cadavers were dissected. The center of trigonal EI muscle was defined as the point where the three medians of the triangle intersect. Three different needle electrode insertion techniques were introduced: M1, 2.5 cm above the lower border of ulnar styloid process (USP), lateral aspect of the ulna; M2, 2 finger breadths (FB) proximal to USP, lateral aspect of the ulna; and M3, distal fourth of the forearm, lateral aspect of the ulna. The distance from USP to the center (X) parallel to the line between radial head to USP, and from medial border of ulna to the center (Y) were measured. The distances between 3 different points (M1- M3) and the center were measured (marked as D1, D2, and D3, respectively). Results The median value of X was 48.3 mm and that of Y was 7.2 mm. The median values of D1, D2 and D3 were 23.3 mm, 13.3 mm and 9.0 mm, respectively. Conclusion The center of EI muscle is located approximately 4.8 cm proximal to USP level and 7.2 mm lateral to the medial border of the ulna. Among the three methods, the technique placing the needle electrode at distal fourth of the forearm and lateral to the radial side of the ulna bone (M3) is the most accurate and closest to the center of the EI muscle.

Original languageEnglish
Pages (from-to)473-476
Number of pages4
JournalAnnals of Rehabilitation Medicine
Volume42
Issue number3
DOIs
Publication statusPublished - 2018 Jun 1

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Ulna
Electromyography
Needles
Muscles
Electrodes
Cadaver
Forearm
Upper Extremity
Fingers
Dissection
Bone and Bones

Keywords

  • Cadaver
  • Electrodiagnosis
  • Electromyography
  • Extensor indicis
  • Needles

ASJC Scopus subject areas

  • Rehabilitation

Cite this

Optimal placement of needle electromyography in extensor indicis : A cadaveric study. / Im, Jin Young; Park, Hong Bum; Lee, Seok Jun; Lim, Seong Gyu; Kim, Ki Hoon; Kim, Dasom; Rhyu, Im Joo; Park, Byung Kyu; Kim, Dong Hwee.

In: Annals of Rehabilitation Medicine, Vol. 42, No. 3, 01.06.2018, p. 473-476.

Research output: Contribution to journalArticle

Im, Jin Young ; Park, Hong Bum ; Lee, Seok Jun ; Lim, Seong Gyu ; Kim, Ki Hoon ; Kim, Dasom ; Rhyu, Im Joo ; Park, Byung Kyu ; Kim, Dong Hwee. / Optimal placement of needle electromyography in extensor indicis : A cadaveric study. In: Annals of Rehabilitation Medicine. 2018 ; Vol. 42, No. 3. pp. 473-476.
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title = "Optimal placement of needle electromyography in extensor indicis: A cadaveric study",
abstract = "Objective To identify the center of extensor indicis (EI) muscle through cadaver dissection and compare the accuracy of different techniques for needle electromyography (EMG) electrode insertion. Methods Eighteen upper limbs of 10 adult cadavers were dissected. The center of trigonal EI muscle was defined as the point where the three medians of the triangle intersect. Three different needle electrode insertion techniques were introduced: M1, 2.5 cm above the lower border of ulnar styloid process (USP), lateral aspect of the ulna; M2, 2 finger breadths (FB) proximal to USP, lateral aspect of the ulna; and M3, distal fourth of the forearm, lateral aspect of the ulna. The distance from USP to the center (X) parallel to the line between radial head to USP, and from medial border of ulna to the center (Y) were measured. The distances between 3 different points (M1- M3) and the center were measured (marked as D1, D2, and D3, respectively). Results The median value of X was 48.3 mm and that of Y was 7.2 mm. The median values of D1, D2 and D3 were 23.3 mm, 13.3 mm and 9.0 mm, respectively. Conclusion The center of EI muscle is located approximately 4.8 cm proximal to USP level and 7.2 mm lateral to the medial border of the ulna. Among the three methods, the technique placing the needle electrode at distal fourth of the forearm and lateral to the radial side of the ulna bone (M3) is the most accurate and closest to the center of the EI muscle.",
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AU - Lee, Seok Jun

AU - Lim, Seong Gyu

AU - Kim, Ki Hoon

AU - Kim, Dasom

AU - Rhyu, Im Joo

AU - Park, Byung Kyu

AU - Kim, Dong Hwee

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N2 - Objective To identify the center of extensor indicis (EI) muscle through cadaver dissection and compare the accuracy of different techniques for needle electromyography (EMG) electrode insertion. Methods Eighteen upper limbs of 10 adult cadavers were dissected. The center of trigonal EI muscle was defined as the point where the three medians of the triangle intersect. Three different needle electrode insertion techniques were introduced: M1, 2.5 cm above the lower border of ulnar styloid process (USP), lateral aspect of the ulna; M2, 2 finger breadths (FB) proximal to USP, lateral aspect of the ulna; and M3, distal fourth of the forearm, lateral aspect of the ulna. The distance from USP to the center (X) parallel to the line between radial head to USP, and from medial border of ulna to the center (Y) were measured. The distances between 3 different points (M1- M3) and the center were measured (marked as D1, D2, and D3, respectively). Results The median value of X was 48.3 mm and that of Y was 7.2 mm. The median values of D1, D2 and D3 were 23.3 mm, 13.3 mm and 9.0 mm, respectively. Conclusion The center of EI muscle is located approximately 4.8 cm proximal to USP level and 7.2 mm lateral to the medial border of the ulna. Among the three methods, the technique placing the needle electrode at distal fourth of the forearm and lateral to the radial side of the ulna bone (M3) is the most accurate and closest to the center of the EI muscle.

AB - Objective To identify the center of extensor indicis (EI) muscle through cadaver dissection and compare the accuracy of different techniques for needle electromyography (EMG) electrode insertion. Methods Eighteen upper limbs of 10 adult cadavers were dissected. The center of trigonal EI muscle was defined as the point where the three medians of the triangle intersect. Three different needle electrode insertion techniques were introduced: M1, 2.5 cm above the lower border of ulnar styloid process (USP), lateral aspect of the ulna; M2, 2 finger breadths (FB) proximal to USP, lateral aspect of the ulna; and M3, distal fourth of the forearm, lateral aspect of the ulna. The distance from USP to the center (X) parallel to the line between radial head to USP, and from medial border of ulna to the center (Y) were measured. The distances between 3 different points (M1- M3) and the center were measured (marked as D1, D2, and D3, respectively). Results The median value of X was 48.3 mm and that of Y was 7.2 mm. The median values of D1, D2 and D3 were 23.3 mm, 13.3 mm and 9.0 mm, respectively. Conclusion The center of EI muscle is located approximately 4.8 cm proximal to USP level and 7.2 mm lateral to the medial border of the ulna. Among the three methods, the technique placing the needle electrode at distal fourth of the forearm and lateral to the radial side of the ulna bone (M3) is the most accurate and closest to the center of the EI muscle.

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KW - Needles

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