Shoulder Girdle Anatomy

Shoulder Girdle Anatomy

1. Bones

   • Clavicle
   • Sternum
   • Scapula

2. Joints

   • Sternoclavicular
     • injury can refer to pectoral region -innervated by C3-4, C5-6
     • clavice, sternum, superior 1st rib
     • disc
       • -shock absorption -resist med-lateral motion
     • ball & socket, saddle
       • 3 DOF
     • Ligaments
       • Capsule
         • strong ant. post, & sup.
       • Costoclavicular
         • elevation & superior glide
       • Interclavicular
         • connects clavicles
         • clavicular depression
     • Motion
       • Elevation/Depression
         • elevation: 40-45 depression: 15
         • frontal plane
         • convex on concave
       • Protraction/Retraction
         • protraction: 15 degrees retraction: 15 degrees
         • transverse plane
         • convex on concave?
       • Rotation (up/down)
         • Sagittal plane
         • spin in place
     • Injury
       • medial force
         • tear disc from rib
       • fx
         • 1st rid prevent depression
   • Acromiumclavicular
     • does not refer pain -C$
     • gliding joing
     • concave (acromium) and convex (clavicle
     • Supporting structures
       • weak capsue
       • AC ligaments
         • inferior & superior
         • horizontal joint stability
           • protect against anterior dispacement and posterior glide
       • Coracoclavicular ligament
         • main support
         • trapezoid and conoid
         • prevent superior dislocation of clavicle on acromion
     • Motion
       • concave (acromion) on convex (clavicle)
       • Rotation
         • 25 degrees upward
         • frontal plane
       • Protraction/Retraction
         • winging: medial edge of scapula lifts off rib cage 35 degrees
         • transverse plane
       • Elevation
         • 20 degree forward
         • sagittal plane
   • Scapulothoracic
     • -moving platform for proper kinematics of GH joint while maintaining dynamic stability -not a true joint)
     • scapula & ribcage
     • stabilizers
       • clavicle
       • muscles
       • atmospheric pressure
     • Scapula position
       • 2nd -7th rib
       • 2" from spine
     • Motion
       • Rotation
         • -upward: 60 degrees -downward: 10 degrees
         • frontal plane A/P axis
         • spin and glide
       • Proraction/Retraction
         • Ab: 13-15 cm Ad: 3-5 cm
         • frontal plane no axis
         • glide
       • Elevation/Depression
         • elevation: 40-45 degrees depression: 10-15 degrees
         • fronal plane no axis
         • translation
       • Accompanying Mvt
         • A/P translation
         • winging/tipping
           • winging: medial boarder moves away from rib cage tipping: inferior angle moves away from rib cage

3. Muscles

   • Trapezius Levator Scapulae Rhomboids Serratus Anterior Pectoralis Minor Subclavius
   • Elevation
     • Upper Trap
     • Levator
     • Rhomboids
   • Depression
     • Lower Trap
     • Serratus
     • Pec Minor
     • Lat
     • Pec major (lower)
   • Abduction
     • Pecs
     • Serratus
   • Adduction
     • Rhomboids
     • Traps
   • Upward Rotation
     • Traps
     • Serratus
   • Downward Rotation
     • Levator
     • Rhomboids
     • Pec minor