quiz 2 Flashcards
4 joints that make up shoulder girdle
Glenohumeral
Acromioclavicular
Sternoclavicular
Scapulothoracic
which 2 joints do you do joint mobs on
GH
Scapulothoracic
sternoclavicular joint type
saddle or plane
multiaxial
ligaments of sternoclavicular (5)
- sternoclavicular ligament
- joint capsule
- interclavicular ligament
- costoclavicular ligament
- articular disc
acromioclavicular joint type
plane triaxial
acromioclavicular ligaments
- fibrous capsule
- acromioclavicular ligament
- coracoclavicular ligament (trapezoid, conoid)
- coracoacromial ligament
GH joint ligaments
anterior: superior, middle, inferior humeral ligaments (prevent anterior dislocation)
superiorly: coracohumeral, transverse humeral
what ligament holds the tendon of bicep inside intertubercular groove
transverse humeral ligament
what is the largest shoulder bursa
subacromial / subdeltoid
loose pack or resting of GH
40-55 degrees abduction
30 degrees horizonal adduction in scapular plane
closed packed position of GH
full abduction w lateral rotation
max congruency
min movement
max stability
capsular pattern of restriction GH
lateral rotation
abduction
medial rotation
3 things that live in subacromial space
- supraspinatus tendon
- biceps long head tendon
- subacromial bursa
what is the roof in the subacromial space formed by
coracoacromial ligament
scapulothoracic joint
not a true joint
no ligaments
what is the loose packed position of scapulothoracic
when arm is resting at the side
no closed pack position
what 3 joints do the scapulothoracic rhythm involve
humerus
scapula
clavicle
what is phase 1 of scapulothoracic rhythm
humerus 30 degrees abduction
scapula minimal movement
clavicle 0-5 degrees of elevation
phase 2 of scapulothoracic rhythm
humerus 40 degrees abduction
scapula 20 degrees upward rotation
clavicle 15 degrees elevation
phase 3 scapulothoracic rhythm
humerus 60 degrees abduction
30 degrees rotation of scapula
clavicle 30-50 degrees posterior rotation, 15 degrees upward elevation
what is the humeral scapular ratio
for every 2 degrees of motion in the humerus there is 1 degree of motion in the scapula
Scapulothoracic joint functions (5)
- Increases ROM of shoulder for greater reach
- Maintain length tension relationship w deltoid
- Provide GH stability
- Injury prevention through shock absorption
- Permits elevation of body
what muscles do flexion shoulder (3)
ant deltoid
biceps
pec major
what mm’s extend the shoulder (2)
post deltoid
triceps
what mm’s do abduction of shoulder (2)
middle delt
supraspinatus
what mm’s do adduction of GH
teres major
lats
what mm’s do horizontal adduction (2)
pec major
coracobrachialis
what mm’s do internal rotation (3)
subscapularis
pec major
lats
what mm’s do external rotation (2)
infraspinatus
teres minor
which 2 joints connect the upper arm to the axial skeleton via clavicle
sternoclavicular
acromioclavicular
how many degrees of abduction is done by humerus and how may degrees in done by scapula
humerus (GH joint) - 130
scapula - 50 degrees
articular surfaces of SC joint
CONVEX sternal head of clavicle
CONCAVE manubrium of sternum
AC joint articular surfaces
CONVEX acromion
convex lateral clavicle
articular surfaces GH
convex head of humerus
concave glenoid cavity
scapulothoracic artic surfaces
concave subscapular fossa
convex posterior ribs
