shoulder girdle Flashcards
major roles of shoulder complex
mobility/stability (more mobile than stable)
positions the UE in space-allows for arm/hand movement
subdeltoid/subacromial joint function
permits smooth gliding b/w the deltoid and coracoacromial arch above and RC and biceps below
separates everything to avoid impingement
ST joint function
maintain optimal orientation of the glenoid fossa with the humeral head
increase elevation
maintain length-tension relationship
SC joint function
only bony attachment of upper limb to body
motion at SC produces scapular motion
AC joint function
maintains the scapular-clavicular relationship during UE elevation
enhances scapular ROM during elevation
What muscle produces: Scapulothoracic elevation
upper trap
What muscle produces: scapulothoracic depression
lower trap
What muscle produces: protraction/abduction of scapulothoracic joint
serratus anterior
What muscle produces: retraction/adduction of ST jt
middle trap
What muscle produces: upward rotation of the scap
upper/lower trap + serratus anterior
What muscle produces: downward rotation of the scapula
levator scapulae and help from lower trap (rhomboids)
during elevation what does the subdeltoid/subacromial joint do
glides superiorly under the AC to allow for greater motion
Setting phase for flexion
60° GH motion
setting phase for abduction
30° GH motion
during phase two what is the GH:ST degree ratio
2° of GH for every 1° ST motion
