A proposal for a new definition of the axial rotation angle of the shoulder joint

Abstract The Euler/Cardan angles are commonly used to define the motions of the upper arm with respect to the trunk. This definition, however, has a problem in that the angles of both the horizontal flexion/extension and the axial rotation of the shoulder joint become unstable at the gimbal-lock pos...

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Bibliographic Details
Published in:Journal of electromyography and kinesiology 2008-02, Vol.18 (1), p.154-159
Main Authors: Masuda, Tadashi, Ishida, Akimasa, Cao, Lili, Morita, Sadao
Format: Article
Language:English
Subjects:
Adult
Cardan angle
Codman’s paradox
Euler angle
Female
Gimbal-lock
Humans
Magnetics
Microcomputers
Motion analysis
Physical Medicine and Rehabilitation
Range of Motion, Articular - physiology
Reference Values
Rotation
Shoulder joint
Shoulder Joint - physiology
Signal Processing, Computer-Assisted
Software
Time Factors
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Description
Summary:Abstract The Euler/Cardan angles are commonly used to define the motions of the upper arm with respect to the trunk. This definition, however, has a problem in that the angles of both the horizontal flexion/extension and the axial rotation of the shoulder joint become unstable at the gimbal-lock positions. In this paper, a new definition of the axial rotation angle was proposed. The proposed angle was stable over the entire range of the shoulder motion. With the new definition, the neutral position of the axial rotation agreed with that in the conventional anatomy. The advantage of the new definition was demonstrated by measuring actual complex motions of the shoulder with a three-dimensional motion capture system.
ISSN:1050-6411
1873-5711
DOI:10.1016/j.jelekin.2006.08.008