ACJ Dislocation
Anatomy
- has fibrocartilage intraarticular disc
- Usually degenerative by 4th decade
- Clavicle may lie superior normally
Stability of ACJ
- Coracoacromial ligs
- Primary restraint to sup translation
- Primary suspensory ligament of upper limb
- Trapezoid Ligament
- Arises anterolateral on coracoid
- Inserts trapezoid ridge anterolateral to conoid
- Almost horizontal in sagittal plane
- PRIMARY restraint to AXIAL compression
- Conoid Ligament
- Arises posteromedial to trapezoid
- Inverted cone
- Inserts conoid tubercle
- Lies vertically
- PRIMARY restraint to SUPERIOR & Anterior translation
- ACJ Capsule
- Strongest superiorly
- As reinforced by acromioclavicular ligament
- Has incomplete fibrocartilage intra-articular disc arising from it
- Usually degenerates by 4th decade
- Deltotrapezial Fascia
- Dynamic stabiliser
Motion at ACJ
- Only small 58°
- 40° at sternoclavicular joint
- Motion is at scapulothoracic rather than ACJ
Webpage Last Modified:
13 April, 2012