Updated: 4/9/2017

Acromioclavicular Joint

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https://upload.orthobullets.com/topic/3033/images/cc ligaments v4.jpg

  • Osteology
    • the AC joint is a diarthrodial joint
    • fibrocartilaginous intraarticular disc is located between the osseous segments  
  • Motion
    • majority of motion is from the bones, not through the joint
      • clavicle rotates 40-50° posteriorly with shoulder elevation
      • 8° of rotation through AC joint
      • remainder from scapular rotation and sternoclavicular motion
    • joint itself is limited to gliding motions only
  • Stability
    • acromioclavicular ligament
      • provides horizontal stability
      • has superior, inferior, anterior, and posterior components
        • superior ligament is strongest, followed by posterior  
    • coracoclavicular ligaments (trapezoid and conoid)
      • provides vertical stability
      • trapezoid inserts 3 cm from end of clavicle
        • stabilizer against horizontal and vertical loads
      • conoid inserts 4.5 cm from end of clavicle in the posterior border
        • more important ligament
        • vertical stabilizer of AC joint
      • normal CC distance (superior coracoid to inferior clavicle) is 11-13mm
    • deltotrapezial fascia, capsule, deltoid and trapezius
      •  act as additional stabilizers
 

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Questions (3)
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(SAE07SM.49) A 29-year-old quarterback falls onto his dominant shoulder and sustains the injury shown in Figures 14a and 14b. Management should consist of Tested Concept

QID: 8711
FIGURES:
1

an arm sling.

5%

(16/298)

2

nonsteroidal anti-inflammatory drugs and a rapid return to activity.

0%

(0/298)

3

arthroscopic partial claviculectomy.

0%

(1/298)

4

acromioclavicular joint reduction and stabilization.

92%

(275/298)

5

acromionectomy.

0%

(1/298)

L 1 E

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(OBQ04.221) When performing an arthroscopic distal clavicle excision for acromioclavicular joint arthrosis, which of the following structures must be preserved to prevent post-operative anteroposterior instability of the clavicle? Tested Concept

QID: 1326
1

Trapezoid ligament

9%

(186/2148)

2

Anterior and inferior acromioclavicular joint capsule

7%

(143/2148)

3

Superior and posterior acromioclavicular joint capsule

75%

(1609/2148)

4

Coracohumeral ligament

3%

(71/2148)

5

Conoid ligament

6%

(127/2148)

L 3 D

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Evidence (5)
VIDEOS (1)
Topic COMMENTS (2)
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