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Definition of AC joint

AC joint: Acromioclavicular joint located between the acromion (a projection of the scapula that forms the point of the shoulder) and the clavicle (the collar bone). This is a gliding type of joint.

The ligaments that serve to support and strengthen this joint are called the capsular; superior and inferior acromioclavicular; articular disk; and coracoclavicular (trapezoid and conoid) ligaments.

Source: MedTerms™ Medical Dictionary
http://www.medterms.com/script/main/art.asp?articlekey=8745
Last Editorial Review: 8/28/2013

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