Radiographic Techniques for Femur

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Questions and Answers

In the femur AP position, the patient is placed in a lateral decubitus position.

False (B)

The central ray is projected perpendicularly towards the femur in the femur AP position.

True (A)

The IR size for femur AP is 10*12 inch.

False (B)

In the lateral femur position, the knee of the filming side is flexed 90 degrees.

<p>False (B)</p> Signup and view all the answers

The patella should be shown in the entire image in the lateral femur position.

<p>False (B)</p> Signup and view all the answers

The femur lateral oblique position requires the patient to be placed in a lateral decubitus position.

<p>False (B)</p> Signup and view all the answers

The lesser trochanter of the femur should be shown completely in the femur lateral oblique position.

<p>False (B)</p> Signup and view all the answers

The femur AP position is used to show the distal portion of the femur only.

<p>False (B)</p> Signup and view all the answers

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Study Notes

Femur Radiographic Techniques

Femur Positions

  • Four types of femur positions: Femur AP, Femur Lateral, Femur Medial Oblique, and Femur Lateral Oblique

Femur AP

  • Positioning: Patient in supine position, femur in center of image receptor (IR), leg rotated 5 degrees medially
  • Anatomy: Includes knee and femur in true anterior-posterior projection image
  • Technical Factors:
    • IR size: 14*17 inch
    • SID: 100cm
    • Central ray: Perpendicular to femur
    • Respiration: Suspended
    • Collimation: Minimum of knee joint cavity and distal and proximal portions of femur
  • Evaluation:
    • Femur must not be in rotation, but show in true anterior-posterior projection image
    • Femoral condyles should be shown symmetrically about patella

Lateral Femur

  • Positioning:
    • Patient in lateral decubitus or supine position
    • Flex knee of filming side 45 degrees, bilateral condyles of femur perpendicular to IR
    • Rotate to the back of opposite leg to avoid overlapping
    • Place bottom of IR 5cm from the knee
  • Evaluation:
    • Patella should be shown in half-side image
    • Neck of femur and greater trochanter must overlap completely
  • Technical Factors:
    • Same as Femur AP position

Femur Lateral Oblique

  • Positioning:
    • Patient in supine position
    • Place femur in center of IR
    • Rotate knee and femur 45 degrees laterally
  • Evaluation:
    • Lesser trochanter of femur should be shown separated in half-side image

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