In the AP axial Beclare method, the long axis of the femur should be placed at what angle?

In the AP axial Beclare method, the long axis of the femur should be placed at what angle?

• A. 20-40 degrees
• B. 40-60 degrees
• C. 60-90 degrees
• D. 0-20 degrees

Answer: (B)

This projection opens up the intercondylar fossa by angling the knee so the femoral shaft sits in a diagonal relative to the beam. For the AP axial Beclere method, you want the long axis of the femur to form roughly a 40–60 degree angle with the imaging plane. This placement, with the knee flexed about 40 degrees, positions the intercondylar fossa so the axial beam can pass through it cleanly and the anatomy isn’t foreshortened or obscured by the surrounding structures. Angles lower than this won’t open the fossa adequately, while angles much higher can distort the view, so 40–60 degrees is the optimal range.

This projection opens up the intercondylar fossa by angling the knee so the femoral shaft sits in a diagonal relative to the beam. For the AP axial Beclere method, you want the long axis of the femur to form roughly a 40–60 degree angle with the imaging plane. This placement, with the knee flexed about 40 degrees, positions the intercondylar fossa so the axial beam can pass through it cleanly and the anatomy isn’t foreshortened or obscured by the surrounding structures. Angles lower than this won’t open the fossa adequately, while angles much higher can distort the view, so 40–60 degrees is the optimal range.