Mediolateral Knee

Question 1

• Which side of the body should the patient be lying on for this projection?

Answer 1

Affected side

Question 2

• How much should the knee be flexed if not patellar fracture is present?

Answer 2

20-30 degrees

Question 3

• How should the femoral condyles be positioned in relation to the IR?

Answer 3

Perpendicular to IR

Question 4

• What is the central ray angle/direction and why?

Answer 4

5-7 degrees cephalic to superimpose condyles, open knee joint

Question 5

• What is the central ray location?

Answer 5

1’ distal to medial epicondyle

Question 6

• How is the patella in relation to the IR?

Answer 6

Parallel to IR

Question 7

• What structure can be used to identify the medial femoral condyle on an image?

Answer 7

Adductor tubercle

Question 8

• If the medial femoral condyle is demonstrated anterior to the lateral femoral condyle, what positioning error occurred?

Answer 8

Rotation

Question 9

• How is the proximal tibia demonstrated in relation to the proximal fibula in a properly positioned lateral knee?

Answer 9

There should be slight superimposition between both heads.