kinesiology >> shoulder >> GHJ stability | SCJ stbaility | ACJ stability |

Shoulder Complex Stability

Factors that stabilize the glenohumeral joint

  • bony configurationĄG not important
  • 5º of superior inclination (upward tilt) of the glenoid cavity
  • shape of cartilage
  • glenoid labrumĄG to contribute 50% of overall depth of the glenoid cavity
  • tension of ligaments

    ligament shoulder motions
    to pull the ligament taut
    humeral head motion
    to pull the ligament taut
    superior glenohumeral lig. full adduction inferior or anterior glide
    middle glenohumeral lig. external rotation anterior glide
    inferior glenohumeral lig.
          anterior band
          posterior band

    abduction and external rotation
    abduction and internal rotation
    non specific
    coracohumeral lig. extremes of flexion, extension, or external rotation inferior glide
  • muscular arrangementĄG rotator cuff
  • supraspinatus
  • infraspinatus
  • teres minor
  • subscapularis
  • capsuleĄG not important
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    Factors that stabilize the sternoclavicular joint

  • bony configurationĄG saddle shaped
  • shape of cartilage
  • interarticular disc to increase the congruity of the irregular articular surface
  • tension of ligamentsĄG
  • costoclavicular ligament (most important)
  • anterior sternoclavicular ligament
  • posterior sternoclavicular ligament
  • interclavicular ligament
  • muscular arrangementĄG
  • strenal head of the sternocleidomastoid muscle (anterior)
  • sternothyroiod and sternhyoid muscles (posterior)
  • capsule
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    Factors that stabilize the acromioclavicular joint

  • bony configurationĄG flat shaped
  • shape of cartilage
  • fibrocartilage with a articular disc
  • tension of ligamentsĄG
  • superior acromioclavicular ligament
  • inferior acromioclavicular ligament
  • coracoclavicular ligamentĄG conoid (medial) and trapezoid ligaments (lateral)
  • muscular arrangementĄG
  • deltoid
  • trapezius
  • capsule
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    Established on 11/09/2002 and Last Updated 12/01/2006 © Huei-Ming Chai, PhD PT          All Right Reserved