Updated: 6/25/2021

Acromioclavicular Joint

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Questions
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Evidence
5
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Videos / Pods
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Topic
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https://upload.orthobullets.com/topic/3033/images/cc ligaments v4.jpg
  • AC joint
    • 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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(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

QID: 8711
FIGURES:
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an arm sling.

5%

(23/470)

2

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

0%

(0/470)

3

arthroscopic partial claviculectomy.

0%

(1/470)

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acromioclavicular joint reduction and stabilization.

93%

(439/470)

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acromionectomy.

0%

(1/470)

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?

QID: 1326
1

Trapezoid ligament

9%

(199/2308)

2

Anterior and inferior acromioclavicular joint capsule

7%

(166/2308)

3

Superior and posterior acromioclavicular joint capsule

74%

(1712/2308)

4

Coracohumeral ligament

3%

(79/2308)

5

Conoid ligament

6%

(140/2308)

L 3 D

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Evidence (5)
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