Elbow Joint Flashcards
What type of joint is the elbow joint?
Synovial hinge joint
What are the articular surfaces of the elbow joint?
Humerus, Ulna and Radius
What are the joints involved in the elbow joint?
Humeroulna joint, Humeroradial joint and proximal radioulnar joint
Describe the relations of the articular surfaces?
Distal end of the humerus with the proximal end of radius and ulna
What are the two articular parts of the humerus?
Trochlea medially and capitulum laterally
What does the trochlea articulate with?
Trochlear notch of ulna
What does the capitulum articulate with?
Radial head
What encloses the elbow and proximal radioulnar joint?
Fibrous capsule
Why does the joint capsule have no direct attachment to the radius?
To allow movement between the ulna and radius such as pronation and supination
What prevents the capsule and synovial membrane from becoming trapped between bones when flexed?
Deep fibres of brachialis
What lines the joint capsule?
Synovial membrane
What are the ligaments involved in stability of the elbow joint?
Ulnar collateral (Medial collateral) and Radial Collateral (Lateral collateral)
What movements do the ligaments limit?
Abduction, adduction and axial rotation
What is the ulnar collateral ligament divided into?
Anterior, posterior and intermediate band
What does the radial collateral blend into?
Anular ligament
What are the moments that occur at the elbow joint?
Flexion and extension
When does flexion occur until?
Contact between forearm and arm prevents further motion
What is the degree of flexion when active?
145
What is the degree of flexion when passive?
160
What muscles are involved in flexion?
Brachilais, biceps brachii and brachioradialis
What limits flexion of the elbow?
Apposition of forearm and arm
What is the ROM of extension?
0
Why is the ROM low?
Returns back to anatomical position
What muscles actively cause extension?
Triceps Brachii and aconeus
