ELBOW COMPLEXELBOW COMPLEX

Elbow ComplexElbow Complex

• Type of joint:Hinge joint.

Uniaxial.

• Function:Antebrachium extension and flexion.

Antebrachium supination and pronation.

Articulating SurfacesArticulating Surfaces

• Humeroulnar:Trochlear notch to trochlea

Flexion and extension

• Humeroradial:Fovea of head of radius to capitulum

Flexion and extension

Pronation and supination

Articulating SurfacesArticulating 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 AngleCarrying 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.

LigamentsLigaments

• Medial (ulnar) collateral:Medial epicondyle to coronoid process and olecranon process.

Slack ligament results in valgus deformity.

LigamentsLigaments

• Lateral (radial) collateral:Lateral epicondyle to annular ligament and olecranon process.

Slack ligament results in varus deformity.

• Close-packed position:Extension.

LigamentsLigaments

• 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.

RelationshipsRelationships

• 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.

RelationshipsRelationships

• 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.