Week 4 Flashcards
4 joints at the shoulder
glenohumeral
sternoclavicular
acromioclavicular
scapulothroacic
What stabilises the AC joint
superior and inferior AC joint capsular ligaments
coracoclavicular ligament
Articular disc
Deltoid and upper trap muscles
What makes shoulders difficult to diagnose
complex joint interplay complex co-operative muscular control Special tests often don't have high specificity & sensitivity regularly painful >90degrees mechanical vs non-mechanical pain pain can be referred from other regions
3 types of impingement
external - encroachment of subacroial space form superior strcutures
spurs may be seen on x ray
External- inadequate muscle stabilisation of scapula
Internal - overhead sports - undersurface of RC against posterosuperior of glenoid during late stage cocking
What stabilises the GH joint
joint capsule and capsular ligaments coracohumeral ligament glenoid labrum rotator cuff muscles LH of biceps brachii
Scapulothroacic Movements
elevation depression adduction adduction upward rotation downward rotation
Overall ratio of GH:ST movement
2:1
Abduction of the arm
Clavicle retracts & posteriorly rotates
scapula tilts and ER
GH ER
supraspinatus contracts - taut superior capsule and depression of HOH
Auxillary pouch stretches - inferior sling for HOH
Role of supraspinatus
superior role of HOH
compression into fossa
restricts superior translation
Infraspinatus, Teres minor, subscap role
depression force on HOH
Infraspinatus and teres minor role
external rotation of humerus
list elevators of the scapulothorcic joint
upper traps
levator scap
rhomboids
list depressors of the scapulothoracic joint
lower traps
lat dorsi
pec minor
subclavius
list protractors of the scapulothoracic joint
serratus anterior
List retractors of the scapulothoracic joint
mid traps
rhomboids
lower traps
List upward rotators of the scapulothoracic joint
serratus anterior
upper and lower traps
Downward rotators of the scapulothoracic joint
rhomboids
pec minor
6 categories of shoulder pain
rotator cuff labral injury instability stiffness ac joint pathology referred pain -Cx -Tx -visceral