Arthrology: Elbow

Question 1

Humeroulnar joint type

Answer 1

Hinge

Question 2

Carrying angle

Answer 2

Male: 11-14 deg
Female: 13-16 deg

Question 3

Humeroulnar/radial flexion arthrokinematics

Answer 3

Anterior roll and glide

Question 4

Humeroulnar/radial extension arthrokinematics

Answer 4

Posterior roll and glide

Question 5

Humeroradial joint type

Answer 5

Hinge

Question 6

Humeroradial pronation/supination arthrokinematics

Answer 6

Static spin

Question 7

Proximal radioulnar joint type

Answer 7

Pivot joint

Question 8

PRUJ pronation arthrokinematics

Answer 8

Anterior roll, posterior glide

Question 9

PRUJ supination arthrokinematics

Answer 9

Posterior roll, anterior glide

Question 10

Ulnar collateral ligament

Answer 10

Primary stabilizer 20-130 deg flexion 2/2 decreased osseous congruency

Question 11

Anterior band ulnar collateral ligament

Answer 11

Primary valgus stabilizer 20-120 deg flexion

Strongest/stiffest

most commonly ruptured

Taut in terminal extension

Question 12

Posterior band, ulnar collateral ligament

Answer 12

Weakest, fan shaped

Taut beyond 55 deg flexion

Secondary valgus restraint in decreased flexion

Equal co-restraint w/ anterior band in terminal flexion

Question 13

Transverse band, ulnar collateral ligament

Answer 13

Little role in stability

Deepens socket for trochlea

Question 14

Radial collateral ligament

Answer 14

Fan shaped, blends with annular lig.

Consistent tension throughout flexion

Restrain against varus, posterolateral instability

Question 15

Innervation

Answer 15

Radial n. - radial-posterior
Musculocutaneous, median n. - ulno-anterior