elbow AP

Question 1

What happens when humeral epicondyles aren’t parallel to the IR?

Answer 1

Elbow rotation. Epicondyles aren’t in profile and more or less than an 1/8th (0.6 cm) of the radial head superimposes the ulna. The radial tuberosity won’t be seen in profile medially and the raidus and ulna aren’t aligned in parallel while the wrist is in AP.

Question 2

What happens when the wrist is internally rotated to PA?

Answer 2

radial tube is rotated posteriorly out of profile.

Question 3

What occurs with elbow flexion?

Answer 3

olecranon out. if the humerus is parallel and forearm bent then forearm distorted vice versa.

Question 4

How does a forearm get distorted and what other effects occur?

Answer 4

Elbow flexion, with forearm away from the IR. The radial head articular surface seen end on slightly projecting onto the joint. The forearm needs to be parallel with the IR to get the elbow joint open.

Question 5

What happens when the CR is centered proximally to the elbow joint?

Answer 5

The capitulum is projected onto the joint

Question 6

What happens when the CR is centered distal to the joint?

Answer 6

Radial head is projected onto joint

Question 7

What is the effect when the CR centering gets further from the joint?

Answer 7

Joint closes and you see more of the radial head articulating surfaces