Arthrology of the Elbow

Question 1

Elbow joint complex

Answer 1

Humeroradial joint
Humeroulnar joint
Proximal radioulnar joint
All joints covered by capsule, inner part synovial membrane, strengthened by ligaments.

Question 2

Humeroradial joint

Answer 2

Spheroidal joint.

Head of radius on capitulum of femur.

Question 3

Humeroulnar joint

Answer 3

Hinge joint, roll and slide with slight rotation.

Trochlea of the femur articulates with the trochlear articular surface of the ulna (inside the olecranon).

Question 4

Proximal radioulnar joint

Answer 4

Pivot joint, allows rotation when twisting arm.

Between head of radius and, radial articular surface of ulna.

Question 5

Lateral collateral ligament

Answer 5

• Radial collateral ligament

- Lateral ulnar collateral ligament

Question 6

Radial collateral ligament

Answer 6

Connects to lateral epicondyle of humerus and goes on the annular ligament, which goes over the radial head.

Question 7

Lateral ulnar collateral ligament

Answer 7

Connects to lateral epicondyle of the humerus to supinator crest on ulna. Stabilizer for varus stress on elbow.

Question 8

Ulnar (medial) collateral ligament

Answer 8

• Anterior portion: Medial epicondyle to coronoid process.
  Provides stability in extension.
• Posterior portion: Medial epicondyle to olecranon. Provides
  stability in flexion.
• Transverse portion: Coronoid process to olecranon.
  Reinforcement, runs along the same bone.

Question 9

Annular ligament

Answer 9

Provides stability to the proximal radioulnar joint.
Surrounds the radial head, inserting at both ends in the radial
notch of the ulna.

Question 10

Bursa

Answer 10

Subtendinous bursa: prevents tricep tendon to hinge against each other.
Intratendinous bursa: prevents tendons from hinging against each other.
Olecranon bursa: prevents friction of the olecranon.