Elbow

Question 1

Trochlea and throchlear notch face anteriorly at what angle? Why?

Answer 1

45 degrees - to allow space between ulna and humerus during flexion

Question 2

Humeroradial, concave/convex? What are they?

Answer 2

Concave on Convex - Capitulum on proximal radius

Question 3

Distal radioulnar joint concave or convex?

Answer 3

Convex ulna on concave radius (opposite to proximal!)

Question 4

Elbow capsule continues medially with what ligaments?

Answer 4

UCL and RCL

Question 5

What does the RCL run from?

Answer 5

Lateral epicondyle of humerus to annular ligament

Question 6

Annular ligament is a _____ ring

Answer 6

Osteofibrous

Question 7

Annular ligament attaches to ____ and encircles _____.

Answer 7

Attaches to medial ulna and encircles radial head.

Question 8

Inner surface of annular ligament is lined with what?

Answer 8

Fibrocartilage

Question 9

When is annular ligement taut?

Answer 9

Pronation and supination

Question 10

Where does the quadrate ligement attach?

Answer 10

Radial notch of ulna to neck of radius

Question 11

What does the quadrate ligament do>

Answer 11

Reinforces inferior joint capsule
Maintain radial head in opposition to ulna
Limits spin in sup/pro

Question 12

What is the main bursa of the elbow? Where is it?

Answer 12

Olecranon - posterior aspect of elbow over olecranon process

Question 13

What is the blood supply of the elbow?

Answer 13

Brachial artery
Anterior ulnar recurrent artery
Posterior ulnar recurrent artery
Radial recurrent artery
Middle collateral branch of deep brachial artery

Question 14

Why is the LCL weak?

Answer 14

Attaches to another soft tissue structure (annular ligament)

Question 15

Which is stronger? LCL or MCL?

Answer 15

MCL

Question 16

Does the ulna pronate or supinate with extension?

Answer 16

Pronate

Question 17

Does the proximal ulna glide medially or laterally during extension?

Answer 17

Medially during extension, laterally during flexion