Download KUMC 20 Elbow Complex Student

ELBOW COMPLEX
Elbow Complex
• Type of joint:
Hinge joint.
Uniaxial.
• Function:
Antebrachium extension and flexion.
Antebrachium supination and pronation.
Articulating Surfaces
• Humeroulnar:
Trochlear notch to trochlea
Flexion and extension
• Humeroradial:
Fovea of head of radius to capitulum
Flexion and extension
Pronation and supination
Articulating Surfaces
• Radioulnar joints:
Superior:
Radial notch of ulna and annular ligament
Inferior:
Ulnar notch of radius, articular disc, head of ulna
Intermediate:
Interosseous membrane
Syndesmosis
Carrying Angle
• Longitudinal axis of humerus:
• Long axis through trochlea:
• Results in a lateral deviation of antebrachium:
5 degrees in men.
10-15 degrees in women.
Increase =
Cubitus valgus.
Decrease =
Cubitus varus.
Ligaments
• Medial (ulnar) collateral:
Medial epicondyle to coronoid process and
olecranon process.
Slack ligament results in valgus deformity.
Ligaments
• Lateral (radial) collateral:
Lateral epicondyle to annular ligament and
olecranon process.
Slack ligament results in varus deformity.
• Close-packed position:
Extension.
Ligaments
• Annular ligament:
Attached to ulna.
Forms sling around neck of radius.
• Note:
Review relationships of muscles, arteries,
and nerves to elbow complex from syllabus.
• Avascular necrosis.
• Lateral epicondylitis.
Relationships
• Bicipital aponeurosis to brachial artery and
median cubital vein.
• Median nerve to brachial artery
• Ulnar nerve to:
Medial epicondyle.
Olecranon process.
Origins of flexor carpi ulnaris.
Relationships
• Epicondyles of humerus to collateral
arteries of cubital region.
• Ulnar artery to deep (ulnar) head of
pronator teres.
• Median nerve to heads of pronator teres.
• Superficial and deep radial nerves to
supinator muscle.