Authors: Masataka Nakazawa Masahiro Koizumi Akimoto Nimura Tatsuo Sato Keiichi Akita
Publish Date: 2011/11/12
Volume: 33, Issue: 10, Pages: 913-918
Abstract
The coracoclavicular joint has been described as an articulation found inconstantly between the coracoid process and clavicle We often observe a small space bordered by the fascia which covers the anterior surface of the subclavius muscle and the coracoclavicular ligament The aim of this study was to observe the space in detail and to discuss the functional role of the coracoclavicular jointSixteen shoulder girdles from eight Japanese cadavers were used in this study The scapula clavicle and anterior half of the first rib were extracted en bloc together with the subclavius muscle and the surrounding fascia After observing the motion of the scapula and clavicle we investigated macroscopically the attachments of the coracoclavicular ligaments and the subclavius muscle and the extension of the fasciaThe fascia divided laterally into two sheets the anterior sheet attached to the trapezoid ligament and the posterior to the conoid ligament Among the two sheets the coracoclavicular ligaments coracoid process and clavicle a small space was observed This small space can be recognized as a part of the coracoclavicular joint When manually moving the inferior angle of the scapula with the sternal end of the clavicle fixed we observed that the clavicle collided with the trapezoid ligament on the superior surface of the coracoid process within the space and that the scapular motion was restricted by this collisionThis study was partly supported by GrantinAid for Scientific Research from the Ministry of Education Culture Sports C No 20590168 and also supported by the grant from Nokyo Kyosai Research Institute Agricultural Cooperative Insurance Research Institute
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