For an AP hip projection, which landmark helps locate the femoral neck?

For an AP hip projection, which landmark helps locate the femoral neck?

• A. Iliac crest
• B. Greater trochanter
• C. Ischial tuberosity
• D. ASIS

Answer: (D)

The anterior superior iliac spine (ASIS) is used to locate the femoral neck on an AP hip projection. The femoral neck lies just below the ASIS, so identifying this landmark lets you estimate where the neck center sits and place the central ray accordingly. This helps ensure the femoral neck is centered and the hip is captured with proper rotation. Other landmarks are less useful for locating the neck: the iliac crest is higher up and more general for pelvis positioning; the greater trochanter helps assess and verify rotation but isn’t the primary reference for centering the neck; the ischial tuberosity is far below the hip joint and not used for hip centering.

The anterior superior iliac spine (ASIS) is used to locate the femoral neck on an AP hip projection. The femoral neck lies just below the ASIS, so identifying this landmark lets you estimate where the neck center sits and place the central ray accordingly. This helps ensure the femoral neck is centered and the hip is captured with proper rotation.

Other landmarks are less useful for locating the neck: the iliac crest is higher up and more general for pelvis positioning; the greater trochanter helps assess and verify rotation but isn’t the primary reference for centering the neck; the ischial tuberosity is far below the hip joint and not used for hip centering.