stability of scapulothoracic articulation is due to? (3)
atmospheric pressure, structures that maintain integrity of AC/SC joints, muscles attached to thorax and scapula
what is the purpose of scapulohumeral rhythm? (2)
maintains the glenoid fossa in optimal position to receive humeral head thus increasing ROM (increasing congruency), permits muscles acting on humerus to maintain a good length-tension relationship
Scapulothoracic and GH Joint motion
ratio of 2:1 (GH motion : ST motion)
first 30 degrees of elevation (2)
Setting phase, Little movement of scapula observed
from 30-90 degrees of elevation (2)
1:2 ratio, Scapula moves approx 1 deg every 2 deg GH motion
90-180 degrees of elevation
1:1 ratio of motion
SC/AC contribution during first 30 degrees of scapulothoracic movement (3)
Clavicle elevates at SC joint, swinging scapula through arc of motion, with axis at base of spine of scapula
SC/AC contribution during last 30 degrees of scapulothoracic movement (3)
Clavicle rotates, flipping lateral end of clavicle up, Remaining scapular rotation has axis at AC joint
force couple during upward rotation of the scapula (3)
serratus anterior and upper and lower traps (during first 30 deg)
SICK scapula syndrome (4)
Scap malposition, Inf med border prominence, Coracoid pain and malposition, dysKinesis of scapular movement
scapular depressors (3)
lower trap, activation of lower trap is indicated when there is ant tilting and delayed upward rotation of the scapula
scapular retractors (3)
rhomboids and trap, activation of these muscles is emphasized when the scapular posture is protracted
scapular protractors (3)
SA, Activation of the SA is emphasized when there is scapular winging, delayed or incomplete upward rotation of the scapula with GH elevation
how many sets/reps should be performed of blackburn exercises?
1-3 sets of 10-15 reps, hold for 2 secs
