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Applied Radiological Anatomy for Medical Students Applied - part 8

Doanh có khả năng chuyển động nhỏ, được kết hợp với chuyển động ở khớp acromioclavicular và hành động để tăng phạm vi chuyển động của toàn bộ chi trên. Các phong trào tại khớp sternoclavicular bao gồm độ cao và trầm cảm, di chuyển ngang về phía trước và lạc hậu, circumduction, và quay trục. | The upper limb ALEX m. barnacle and ADAM w. m. mitchell interclavicular ligament which lies within the suprasternal notch and focal thickening of the joint capsule known as the anterior and posterior sternoclavicular ligaments. Each joint contains a fibrocarti-lagenous disk dividing the joint into medial and lateral synovial compartments. The joint is capable of small movements which are associated with movement at the acromioclavicular joint and which act to increase the range of movement of the whole upper limb. Movements at the sternoclavicular joint include elevation and depression horizontal forward and backward movement circumduction and axial rotation. The acromioclavicular joint The acromioclavicular joint is a complex synovial joint between the lateral border of the clavicle and the medial aspect of the acromion of the scapula. The joint contains an incomplete fibrocartilaginous disk and is surrounded by a weak synovial joint capsule. Accessory ligaments comprise the aromioclavicular ligament a fibrous band that overlies the superior surface of the joint and the coracoclavicular ligament that extends from the inferior surface of the clavicle to the superior surface of the coracoid process providing a strong attachment of the clavicle to the scapula and lending stability to the joint. Disruption of the ligaments or the joint capsule itself will result in widening of the joint space and the clavicle will override the acromion. The supraspinatus tendon runs immediately below the acromioclavicular joint. Any degenerative disease in the joint may cause irregularity of the under surface of the joint which in turn causes wear and tear of the tendon and loss of the normal tendon thickness. When assessing plain radiographs of the shoulder observe the soft tissues inferior to the acromioclavicular joint for narrowing of the distance between it and the humeral head and for calcification within the supraspinatus tendon. Ultrasound examination of the shoulder provides