acromioclavicular joint
This article or section does not adequately cite its references or sources.
Please help improve this article by adding citations to reliable sources. (help, get involved!)
This article has been tagged since October 2006.
| 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.
|
Contents
- 1 Function
- 2 Ligaments
- 3 Injuries
- 4 Additional images
|
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:
- The acromioclavicular ligament, which attaches the clavicle to the acromion of the scapula.
- The coracoacromial ligament, which runs from the coracoid process to the acromion.
- The coracoclavicular ligament, which consists of two ligaments, the conoid and the trapezoid 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).
Additional images
Diagram of the human shoulder joint
|
|
v • d • e
Joints and ligaments of upper limbs |
| SHOULDER - sternoclavicular: 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
ELBOW - proximal radioulnar, humeroradial, humeroulnar: ulnar collateral - radial collateral - annular - oblique cord
distal radioulnar volar radioulnar - dorsal radioulnar
wrist/radiocarpal: palmar radiocarpal - dorsal radiocarpal - ulnar collateral - radial collateral
intercarpal, midcarpal: pisohamate ligament - pisometacarpal ligament
carpometacarpal: dorsal carpometacarpal - palmar carpometacarpal
intermetacarpal: deep transverse metacarpal - superficial transverse metacarpal
metacarpophalangeal, interphalangeal
|
Search Term: "Acromioclavicular_joint"
Categories: Articles lacking sources from October 2006 | All articles lacking sources | Upper limb anatomy |
