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Encyclopedia > Acromioclavicular

Acromioclavicular joint
The left shoulder and acromioclavicular joints, and the proper ligaments of the scapula.
Glenoid fossa of right side.
Latin articulatio acromioclavicularis
Gray's subject #82 315
MeSH Acromioclavicular+Joint
Dorlands/Elsevier a_64/12160945

The acromioclavicular joint, or AC joint, is a joint at the top of the shoulder. It is the junction between the acromion (part of the scapula that forms the highest point of the shoulder) and the clavicle. Latin is an ancient Indo-European language originally spoken in Latium, the region immediately surrounding Rome. ... Medical Subject Headings (MeSH) is a huge controlled vocabulary (or metadata system) for the purpose of indexing journal articles and books in the life sciences. ... Elseviers logo. ... A joint (from French joint) (articulation) is the location at which two bones make contact (articulate). ... This article is about the body part. ... The acromion process, or simply the acromion, is an anatomical feature on the scapula. ... Left scapula - front view () Left scapula - rear view () In anatomy, the scapula, or shoulder blade, is the bone that connects the humerus (arm bone) with the clavicle (collar bone). ... Collarbone and collar bone redirect here. ...

Contents

Function

The AC joint allows the ability to raise the arm above the head. This joint functions as a pivot point (although technically it is a gliding synovial joint), acting like a strut to help with movement of the scapula resulting in a greater degree of arm rotation.


Ligaments

The joint is stabilized by three ligaments: A ligament is a short band of tough fibrous connective tissue composed mainly of long, stringy collagen fibres. ...

The Acromioclavicular ligament is part of the acromioclavicular joint. ... The Coracoacromial Ligament is a strong triangular band, extending between the coracoid process and the acromion. ... The Coracoclavicular Ligament serves to connect the clavicle with the coracoid process of the scapula. ... The Conoid Ligament, the posterior and medial fasciculus, is a dense band of fibers, conical in form, with its base directed upward. ... The trapezoid ligament, the anterior and lateral fasciculus, is broad, thin, and quadrilateral: it is placed obliquely between the coracoid process and the clavicle. ...

Injuries

Main article: Separated shoulder

A common injury to the AC joint is dislocation, often called AC separation or shoulder separation. This is not the same as a "shoulder dislocation," which refers to dislocation of the Glenohumeral joint. See also Acromioclavicular joint // A separated shoulder, otherwise known as an acromioclavicular separation or AC separation, is a common injury to the acromioclavicular joint. ... This article or section does not cite its references or sources. ...


AC dislocation is common in sports such as football, soccer, horseback riding, mountain biking, and biking. AC dislocations are rated in terms of severity on a scale of 1 to 6, 6 being the most severe. The most common mechanism of injury is a fall on the tip of the shoulder or FOOSH (Falls on an outstretched hand). Look up Football in Wiktionary, the free dictionary. ... Football is a ball game played between two teams of eleven players, each attempting to win by scoring more goals than their opponent. ... horse, see Horse (disambiguation). ... Mountain biker riding in the Arizona desert. ... ...


Additional images


  Results from FactBites:
 
Acromioclavicular joint injuries | separation | sprain (2031 words)
Acromioclavicular dislocation was recognised as early as 400 BC by Hippocrates
The acromioclavicular ligaments contribute approximately two-thirds of the constraining force to superior and posterior displacement; however, with greater displacement the coracoclavicular ligaments contribute the major share of the resistance.
The acromioclavicular ligament is sprained with an intact coracoclavicular ligament.
The Steadman-Hawkins Clinic (588 words)
The severity of an acromioclavicular joint injury depends on which supporting structures are damaged, and the extent of that damage.
Tearing of the acromioclavicular ligament alone is not a serious injury, but when the coracoclavicular ligaments are ruptured, the whole shoulder unit is involved, thus complicating the dislocation.
The acromioclavicular ligament, the coracoclavicular ligaments, and the capsule surrounding the joint are torn.
  More results at FactBites »

 

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