Shoulder Theory Flashcards
The shoulder complex consists of four articulations, name them
Scapulothoracic
Sternaclavicular
Acromioclavicular
Glenohumeral
What muscles maintain contact between scapula and thorax
Subscapularis
Lat. Dorsi
Infra & supraspinatus
Levator Scapulae
What ligaments support the sternoclavicular joint
Anterior and posterior Sternoclavicular ligament
Interclavicular ligament
Costoclavicular ligament
Clavicle may posteriorly rotate how much degrees
30-55
What supports the acromioclavicular joint
Acromioclavicular ligament
Trapezius tendon
Coracoclavicular ligament
Conoid prevents what
Restricts Widening and vertical displacement of clavicle
Trapezoid ligament prevents what?
Narrowing of angle between clavicle and scalp
MOI of AC joint dislocation
Landing on elbow or shoulder
In the Glenohumeral joint, at rest, what resists gravity for the arm
Coracohumeral ligament
Superior capsule
What is the close packed position of the shoulder
Abduction and lateral rotation
Explain scapulohumeral rhythm
GH 2: scapula 1 rotation in motion
120 degress GH motion : scap 60 degrees
Scap component small during first 30 degrees
What type of movement does the acromioclavicular joint allow
Protraction/retraction on a vertical axis
Tipping of scapula
What is the MOI of dislocation of AC joint
Following on elbow
What is the MOI of AC joint dislocation + rupture of coracoclavicular ligament
Falling directly of shoulder
What makes up the coracoacromial arch
Coracoid process
Acromion
Coracoacriomial ligament
