AP Hip

Question 1

How should the feet be positioned for the AP projection of the hip? Why?

Answer 1

Feet internally rotated 15-20 degrees to bring femoral neck parallel with IR

Question 2

Explain the hip localization technique. Where is the femoral neck? Femoral head?

Answer 2

Draw a line from ASIS to Superior margin of
Pubic Symphysis
Draw another perpendicular to the midpoint
of the 1st line.
Femoral Head: 1 ½” down
Femoral Neck: 2 ½” down

Question 3

What is the central ray location?

Answer 3

At femoral neck, 2.5” down from the perpendicular midpoint line

Question 4

How should the femoral neck be placed in relationship to the IR?

Answer 4

Parallel

Question 5

How is the central ray in relationship to the femoral neck?

Answer 5

Perpendicular

Question 6

How is the greater trochanter demonstrated on this image?

Answer 6

In profile laterally

Question 7

How is the femoral neck demonstrated on this image?

Answer 7

Femoral neck seen without foreshortening

Question 8

Where should the lesser trochanter be seen on this image?

Answer 8

Seen medially just slightly

Question 9

When performing the AP projection on a patient with an orthopedic appliance, what 2 things should be done?

Answer 9

AEC turned off, get all of the prosthesis in one image

Question 10

How much of the femur should be demonstrated in the AP projection?

Answer 10

Proximal 1/3 of femur