An electromyographic study of wrist motion : analysis of the prime movers and circumduction

• Wang Chao Hung

  Department of OrthopaediC'Surgery, Kobe University School of Medicine

• Takebe Kyoichi

  Department of OrthopaediC'Surgery, Kobe University School of Medicine

Bibliographic Information

Other Title

• 手関節運動の節電図学的研究 : 主動筋と分回し運動の検索を中心に

Abstract

The purpose of this study is to investigate the relationships between muscular activities and wrist movement using the goniometer and the electromyography. An analysis of basic movements of the wrist joint was performed using the goniometer in twenty adults and eight patients with radial nerve palsy. Basic movements included dorsiflexion, palmar flexion, radial or ulnar flexion and circumduction. Action potentials of the extensor carpi radialis longus and brevis, the extensor carpi ulnaris, the extensor digitorum, the flexor carpi radialis and the flexor carpi ulnaris was obtained by the use of the skin electrodes. Each movement was divided into three phases ; these were the initial-, middle- and final phases. Proportions of the discharge value from the muscle in the each phase to the maximum value were calculated which was defined as 100. The prime movers of each movement were as follows : 1) dorsiflexion : extensor carpi radialis brevis, extensor carpi ulnaris and extensor digitorum. 2) palmar flexion : flexor carpi radialis and flexor carpi ulnaris. 3) radial flexion : extensor carpi radialis brevis and flexor carpi radialis. 4) ulnar flexion : extensor carpi ulnaris and flexor carpi ulnaris. During dorsiflexion the average values of muscular activity of the extensor carpi radialis brevis in each phase were 28.9%, 44.8% and 67.8 %. The other movers showed similar values in each movements. Circumduction showed an ellipsoidal locus with an axis from ulno-palmar to radio-dorsal which composed with all movements described above, and seemed to be the most important movemnt in dairy living. Circumduction with pronation at 45 degrees showed maximum locus with the most active discharges of the prime movers. Activities of the non-paralytic movers increased in circumduction of the radial nerve palsy after injury, whereas they decreased to the normal level as recovery of the paralytic movers. It is concluded that these results play an important role in restoration of the hand.

Journal

• Medical journal of Kobe University

  Medical journal of Kobe University 45 (1), 227-238, 1984-01

  Kobe University

Keywords

• circumduction
• electromyography
• prime mover
• wrist joint

Details

• CRID: 1573105977069734272
• NII Article ID: 110006219473
• NII Book ID: AN00085973
• ISSN: 00756431
• Text Lang: ja
• Data Source:
  • CiNii Articles