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Information about Acromioclavicular Joint

Acromioclavicular joint
The left shoulder and acromioclavicular joints, and the proper ligaments of the scapula.
Glenoid fossa of right side.
Latinarticulatio acromioclavicularis
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.

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:

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.

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).

AC dislocations are also graded from I to III. Grading is based upon the degree of separation of the acromion from the clavical with weight applied to the arm. Grade I is a tear of the AC ligament. It has the normal separation of <4mm. Grade II is a complete dislocation of AC ligament with partial disruption of coracoclavicular ligament. The AC gap is >5mm. Grade III is complete disruption of AC and CC ligaments. On plain film the inferior aspect of the clavicle will be above the superior aspect of the acromion. The joint will be very tender and swollen on examination.

Additional images


Diagram of the human shoulder joint




 •  • [ e]
Joints and ligaments of upper limbs
Shouldersternoclavicular: anterior sternoclavicular - posterior sternoclavicular - interclavicular - costoclavicular acromioclavicular: acromioclavicular - coracoclavicular (trapezoid, conoid) - coracoacromial - superior transverse scapular - inferior transverse of scapula glenohumeral: coracohumeral - glenohumeral (superior, middle, and inferior) - transverse humeral - glenoid labrum
Elbowproximal radioulnar, humeroradial, humeroulnar: ulnar collateral - radial collateral - annular - oblique cord
Forearmdistal radioulnar: volar radioulnar - dorsal radioulnar
wrist/radiocarpal: palmar radiocarpal - dorsal radiocarpal - ulnar collateral - radial collateral
Handintercarpal, midcarpal: pisohamate ligament - pisometacarpal ligament carpometacarpal: dorsal carpometacarpal - palmar carpometacarpal intermetacarpal: deep transverse metacarpal - superficial transverse metacarpal metacarpophalangeal, interphalangeal
Latin}}} 
Official status
Official language of: Vatican City
Used for official purposes, but not spoken in everyday speech
Regulated by: Opus Fundatum Latinitas
Roman Catholic Church
Language codes
ISO 639-1: la
ISO 639-2: lat
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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. Created and updated by the United States National Library of Medicine (NLM), it is used by the MEDLINE/PubMed
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Elsevier, the world's largest publisher of medical and scientific literature, forms part of the Reed Elsevier group. Based in Amsterdam, the company has substantial operations in the UK, USA and elsewhere.
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Released October 31, 2007
Genre J-Pop
Length N/A
Label Geneon
Producer(s) I've Sound

Mami Kawada singles chronology

Get my way!
(2007) JOINT
(2007)

JOINT
..... Click the link for more information.
In human anatomy, the shoulder comprises the part of the body where the arm attaches to the torso. It is made up of three bones: the clavicle (collarbone), the scapula (shoulder blade), and the humerus (upper arm bone) as well as associated muscles, ligaments and tendons.
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The acromion process, or simply the acromion, is an anatomical feature on the scapula.

In humans

It is a continuation of the scapular spine, and hooks over anteriorly.

The acromion articulates with the clavicle to form the acromioclavicular joint.
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scapula, or shoulder blade, is the bone that connects the humerus (arm bone) with the clavicle (collar bone).

The scapula forms the posterior part of the shoulder girdle. In humans, it is a flat bone, roughly triangular in shape.
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Collarbone and collar bone redirect here. The eye abnormality is correctly spelled coloboma.
This article uses some professional terms to describe relative positions and directions.

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In anatomy, the term ligament is used to denote three different types of structures:[1]
  1. Fibrous tissue that connects bones to other bones. They are sometimes called "articular ligaments"[2], "fibrous ligaments", or "true ligaments".

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The Acromioclavicular ligament is part of the acromioclavicular joint. It is divided into two parts: superior and inferior.

Superior Acromioclavicular Ligament

This ligament is a quadrilateral band, covering the superior part of the articulation, and extending between the
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The acromion process, or simply the acromion, is an anatomical feature on the scapula.

In humans

It is a continuation of the scapular spine, and hooks over anteriorly.

The acromion articulates with the clavicle to form the acromioclavicular joint.
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The Coracoacromial Ligament is a strong triangular band, extending between the coracoid process and the acromion.

It is attached, by its apex, to the summit of the acromion just in front of the articular surface for the clavicle; and by its broad base to the whole length of
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The Coracoclavicular Ligament serves to connect the clavicle with the coracoid process of the scapula.

It does not properly belong the acromioclavicular joint articulation, but is usually described with it, since it forms a most efficient means of retaining the clavicle in
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The Conoid Ligament, the posterior and medial fasciculus, is a dense band of fibers, conical in form, with its base directed upward.

It is attached by its apex to a rough impression at the base of the coracoid process, medial to the trapezoid ligament; above, by its
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The trapezoid ligament, the anterior and lateral fasciculus, is broad, thin, and quadrilateral: it is placed obliquely between the coracoid process and the clavicle.
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This article or section is in need of attention from an expert on the subject.
Please help recruit one or [ improve this article] yourself. See the talk page for details.
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The glenohumeral joint, commonly known as the shoulder joint, is a synovial ball and socket joint and involves articulation between the glenoid fossa of the scapula (shoulder blade) and the head of the humerus (upper arm bone).
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Football is the name given to a number of different team sports. The most popular of these world-wide is association football (also known as soccer). The English word "football" is also applied to American football (also known as gridiron), Australian rules football, Canadian
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Association football, commonly known as football or soccer, is a team sport played between two teams of 11 players. It is the most popular sport in the world.
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Equestrianism refers to the skill of riding or driving horses. This broad description includes both use of horses for practical, working purposes as well as recreational activities and competitive sports.
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Mountain biking usually refers to the sport of riding bicycles possessing particular design characteristics, mountain bikes, off-road, although sometimes the term simply refers to riding a mountain bike. The sport requires endurance, bike handling skills and self-reliance.
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Cycling is a means of transport, a form of recreation, and a sport. The bicycle carries riders across land, through tunnels, over bridges, snow, or, less frequently, over ice (icebiking).
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Released October 31, 2007
Genre J-Pop
Length N/A
Label Geneon
Producer(s) I've Sound

Mami Kawada singles chronology

Get my way!
(2007) JOINT
(2007)

JOINT
..... Click the link for more information.
In anatomy, the term ligament is used to denote three different types of structures:[1]
  1. Fibrous tissue that connects bones to other bones. They are sometimes called "articular ligaments"[2], "fibrous ligaments", or "true ligaments".

..... Click the link for more information.
In human anatomy, the upper limb (also upper extremity) refers to what in common English is known as the arm, that is, the region of the shoulder to the fingertips. It includes the entire limb, and thus, is not synonymous with the term upper arm.
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In human anatomy, the shoulder comprises the part of the body where the arm attaches to the torso. It is made up of three bones: the clavicle (collarbone), the scapula (shoulder blade), and the humerus (upper arm bone) as well as associated muscles, ligaments and tendons.
..... Click the link for more information.
The sternoclavicular articulation is a double arthrodial joint. The parts entering into its formation are the sternal end of the clavicle, the upper and lateral part of the manubrium sterni, and the cartilage of the first rib, visible from the outside as the suprasternal notch.
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The anterior sternoclavicular ligament is a broad band of fibers, covering the anterior surface of the articulation; it is attached above to the upper and front part of the sternal end of the clavicle, and, passing obliquely downward and medialward, is attached below to the front
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The posterior sternoclavicular ligament is a band of fibers, covering the posterior surface of the sternoclavicular joint. It is attached above to the upper and back part of the sternal end of the clavicle, and, passing obliquely downward and medialward, is fixed below to the back
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The interclavicular ligament is a flattened band, which varies considerably in form and size in different individuals, it passes in a curved direction from the upper part of the sternal end of one clavicle to that of the other, and is also attached to the upper margin of the
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