1991 Fiscal Year Final Research Report Summary
Biomechanical study of the shoulder complex
| Project/Area Number |
02650174
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
機械力学・制御工学
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| Research Institution | Institute for Medical & Dental Engineering, Tokyo Medical & Dental Univ. |
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Principal Investigator |
ISHIDA Akimasa Institute for Med. & Dent. Engng., Tokyo Med. & Dent. Univ. Prof., 医用器材研究所, 教授 (60016540)
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| Co-Investigator(Kenkyū-buntansha) |
NAKAGAWA Teruhiko Faculty of Medicine Tokyo Med. & Dent. Univ. Associate, 医学部, 助手 (60207735)
ISHIZUKI Masafumi Faculty of Medicine Tokyo Med. & Dent. Univ. Lecturer Research, 医学部, 講師 (60114732)
MIYAZAKI Shinji Institute for Med. & Dent. Engng., Tokyo Med. & Dent. Univ. Research Associate, 医用器材研究所, 助手 (10014284)
NOSHIRO Makoto Institute for Med. & Dent. Engng., Tokyo Med. & Dent. Univ. Ass. Prof. Research, 医用器材研究所, 助教授 (80014231)
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| Project Period (FY) |
1990 – 1991
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| Keywords | shoulder complex / 3-D measurement of motion / electromyography |
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| Research Abstract |
The shoulder complex is composed of the scapula, clavicle and humerus. shoulder motion is attained by cooperation of these elements. In order to analyse the shoulder complex mechanism, we carried out following experiments.
1)Measurement of motion of the scapula and humerus and EMG
Using a magnetic sensor system(3 SPACE). we measured three dimensional motion of the scapula and humerus in elevation in the sagittal, scapular and frontal plane.
We measured Euler angles of the scapula(scapulothoracic angle)and humerus and excursion of the scapula with respect to the reference coordinte attached to the trunk. And we calculated relative Euler angles between the scapula and humerus(gleno humeral angle).
The ratio of glenohumeral to scapulothoracic angle during elevation was not constant as reported so far. Instead this ratio varied considerably. Motion pattern of abduction was different from that of other elevation. The abduction proved to be difficult motion from a viewpoint of biomechanics. In accordance with this, ranges of abduction of abnormal shoulders were considerably small.
2)Experiment of pitching
Using 3-D angles of the humerus with respect to the trunk, it was possible to discriminate four phases of pitching. Motion pattern of skilled pitching was markedly different from that of unskilled pitching, especially in the rotation of the humerus and electromyographies.
3)Experiment with the shoulders of cadavers
From experiments of maximum circumduction of cadaver specimens, it was found that there exists linear relationship between the range of motion and the rotation of the humerus. This means restriction of rotation of the humerus causes decrease of the range of motion.
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