Acromioclavicular Joint

From WikiMSK

This article is a stub.
Shoulder and acromioclavicular joint with ligaments gray.png
Left shoulder and acromioclavicular joint
Acromioclavicular Joint
Primary Type Synovial Joint
Secondary Type Planar Joint
Bones Scapula, Clavicle
Feature Fibrocartilaginous wedge-shaped disc.
Ligaments Coracoclavicular, coracoacromial, superior acromioclavicular, and inferior acromioclavicular ligaments.
Muscles No muscles directly act on this joint.
Innervation Axillary, suprascapular, and lateral pectoral nerves
Vasculature Suprascapular and thoracoacromial arteries
ROM Upward rotation: 30 degrees, external rotation:8 degrees
Volume 2mL
Conditions Acromioclavicular Joint Osteoarthritis, Acromioclavicular Joint Injury

The acromioclavicular joint (ACJ) is formed by the junction between the acromion process of the scapula and the distal clavicle. It is a plane synovial joint and forms part of the shoulder girdle (ACJ, GHJ, and SCJ). It can include a fibrocartilaginous disk

Range of Motion

There is significant motion at the ACJ during elevation of the humerus.(See Shoulder Biomechanics).[1]


  1. Teece, Rachael M.; Lunden, Jason B.; Lloyd, Angela S.; Kaiser, Andrew P.; Cieminski, Cort J.; Ludewig, Paula M. (2008-04). "Three-dimensional acromioclavicular joint motions during elevation of the arm". The Journal of Orthopaedic and Sports Physical Therapy. 38 (4): 181–190. doi:10.2519/jospt.2008.2386. ISSN 0190-6011. PMC 2759875. PMID 18434666. Check date values in: |date= (help)