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provide mobility for the hand in space and provide stability for skilled or forceful movements of the hand
What is the function of the elbow?
How many degrees of freedom does the humeroulnar joint have? What movements can it do?
coronoid process enters the coronoid fossa
What happens when the humeroulnar joint goes into flexion?
olecranon process enters olecranon fossa
What happens when the humeroulnar joint goes into extension?
distal end of humerus bulges anteriorly 45 degrees
What allows the humerus and ulna to be almost parallel before the coronoid process enters the fossa?
2, flexion/extension and pronation/supination
How many degrees of freedom does the humeroradial joint have? What are its main actions?
How many degrees of freedom does the radioulnar joint have? What is its main action?
convex on concave, superior roll, inferior glide
Describe the arthrokinematics of the radioulnar joint, and the rolls and glides.
in order for the last 20 degrees of elbow flexion to be reached, what ligament must be stretched?
What is the name given to the collaginous sheet running between the radius and the ulna?
provides stability for the proximal and distal radioulnar joint
What is the function of the interosseus membrane?
When is the interosseus membrane relaxed? What is supporting the system in this position?
supination in extreme pronation or pronation in extreme supination
Other than flexion, what type of movents can the brachioradialis produce?
pronator teres and pronator quadratus
What muscles act as the supporting structures when the interosseus membrane is lax?
70 degrees of flexion, 45 degrees of pronation
What is close packed position for the humeroradial joint?
superior roll, inferior glide, convex on concave
Describe the rolls and glides and arthrokinematics of the proximal radioulnar joint
gravity, tightening pecs to lock out arm
How could you extend your elbow if the radial nerve was damaged?
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