Evaluation Criteria: Knees and Patella

Question 1

What are two reasons why we take knee images?

Answer 1

1. Loose bodies in joint space “Joint mice”
2. Trauma

Question 2

What should we see on axial tunnel methods (AP and PA?)

Answer 2

1. Open intercondylar fossa
2. Posterioinferior surface of condyles
3. Plateaus should be in profile
4. Visible intercondylar eminence
5. No rotation

Question 3

Where does the patella develop?

Answer 3

Develops in the tendon of the quadriceps femoris

Question 4

Where does the fabella develop?

Answer 4

Develops in the tendon of the lateral head of the gastrocnemius

Question 5

What should you see in an AP or PA patella projection?

Answer 5

1. Patella completely superimposed by femur
2. No rotation
3. Marker in correct orientation

Question 6

What should you see in Tangential Patella –Inferosuperior Projections?

Answer 6

1. Patella in profile
2. Inferior and superior borders superimposed
3. Open patellofemoral joint
4. Anterior surfaces of femoral condyles

Question 7

What is the best projection for visualizing vertical fractures of the patella?

Answer 7

Tangential Patella –Inferosuperior Projections

Question 8

How do you position a settagast prone?

Answer 8

Prone
Knee flexed 90°
CR: 15-20° from long axis of lower leg
Do not attempt if there is a knee injury

Question 9

How do you position a settagast sitting?

Answer 9

Patient sitting near end of table
Knee flexed 90°
Use thyroid, thorax, and gonadal shielding
CR: 15-20° from long axis of lower leg
Do not attempt if knee injury