Station 2: Shoulder Flashcards
Normal Shoulder Flexion ROM?
150-180 degrees
Normal Shoulder Hyperextension ROM?
50 degrees
Normal Shoulder Lateral Rotation ROM?
90 degrees
Normal Shoulder Medial Rotation ROM?
70 degrees
How can the body compensate to allow for more shoulder flexion?
Extend trunk
How can the body compensate to allow for more shoulder extension?
Flex trunk
What type of joint is the acromioclavicular joint?
Plane
What type of joint is the sternoclavicular joint?
Shallow Saddle
What type of joint is the glenohumeral joint?
Ball and Socket
What is the scapulothoracic articulation?
Almost a joint but no bone on bone contact
Scapula moves over the ribs but doesn’t directly touch
Which two joints move in unison to move the shoulder girdle?
Sternoclavicular and Acromioclavicular joint
Can shoulder girdle movements be performed without arm?
Yes - elevation/depression, upward/downward rotation, protraction/retraction
Articulation is between scapula and clavicle so arm not needed
How can you describe shoulder stability/mobility
Less stable but more mobility because of the shallow socket
What does the glenoid labrum do?
Deepens cavity, creates more stability and suctions the socket. Very similar to acetabulum
Name the actions at the Glenohumeral Joint
Flexion/Extension, Adduction/Abduction, Horizontal Adduction/Abduction, External/Internal Rotation, Circumduction
Which muscles are the agonists of glenohumeral abduction?
Supraspinatus and Deltoid
What is special about the Supraspinatus and Deltoid for glenohumeral abduction?
They are agonists at different degrees
- 0-30 degrees: Supraspinatus
- 30-90 degrees: deltoid
Which muscle is the agonist of glenohumeral abduction at 0-30 degrees?
Supraspinatus
Which muscle is the agonist of glenohumeral abduction at 30-90 degrees?
Deltoid
What is a clear sign of a supraspinatus tear?
Patient cannot abduct at start. Supraspinatus is agonist for start
Which muscle is the agonist of glenohumeral internal rotation?
Subscapularis
What muscles are the agonist of glenohumeral external rotation?
Infraspinatus and Teres minor
Are we stronger in glenohumeral internal or external rotation?
Internal rotation
3:2 strength balance ratio for internal rotators
What is the strength balance ratio for internal/external rotation?
3:2
Internal rotators are 150% stronger than external rotators
What are the actions of the Shoulder Girdle?
Elevation/Depression, Protraction/Retraction, Upward/Downward Rotation
What is a bursar?
Pad of fat which stops friction
Which muscles lay between the scapula and thoracic cage?
Serratus anterior and Subscapularis
What is scapulohumeral Rhythm?
When the arm moves, the scapula has to move with it
(2 degrees of abduction, 1 degree of upward rotation of scapula)
