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Acromioclavicular Joint

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Topic updated on 01/22/13 8:00pm

  • 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 degrees
      • 8 degrees of rotation through AC joint
      • remainder from scapular rotation
    • 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
      • conoid inserts 4.5 cm from end of clavicle in the posterior border
    • capsule, deltoid and trapezius
      •  act as additional stabilizers

 

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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? Topic Review Topic

1. Trapezoid ligament
2. Anterior and inferior acromioclavicular joint capsule
3. Superior and posterior acromioclavicular joint capsule
4. Coracohumeral ligament
5. Conoid ligament

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A narrated overview of the anatomy of the AC joint and the surrounding region....
1/22/2013
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