Standing Radiograph in AP Projection for Lower Limb Alignment
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Questions and Answers

What is the basic tool for radiologic analysis of lower limb alignment?

  • Anteroposterior view with the patient lying down
  • Lateral view with the patient lying down
  • Oblique view with the patient sitting
  • Anteroposterior view with the patient standing (correct)
  • In lower limb radiography, how should the patient's legs be positioned in relation to the pelvis?

  • Legs folded under the body
  • Legs crossed
  • Legs as far as possible in a similar relationship to the pelvis (correct)
  • Legs extended straight out
  • To correctly evaluate lower limb alignment in the frontal plane, what must be parallel to the X-ray film?

  • Knee joint
  • Patellae (correct)
  • Fibula
  • Femoral head
  • What is the direction of the X-ray beam in a full-length standing radiograph for lower limb alignment evaluation?

    <p>Horizontal towards a point midway between knee joints</p> Signup and view all the answers

    In DDR method for lower limb radiography, where does the patient face while standing erect?

    <p>Towards the X-ray tube</p> Signup and view all the answers

    What position should the femoral condyles be in for a correct evaluation of lower limb alignment in radiography?

    <p>Parallel to each other</p> Signup and view all the answers

    What is the correct patient positioning for a lateral (basic) projection of the knee?

    <p>Patient rotates onto the affected side with the knee slightly bent</p> Signup and view all the answers

    In lower limb radiography, where should the collimated vertical X-ray beam be centered for a femoral shaft image?

    <p>At the middle of the femoral shaft</p> Signup and view all the answers

    What is a crucial indicator that rotation has been minimized during lower limb radiography?

    <p>Centralization of the patella</p> Signup and view all the answers

    Why is it important not to rotate the limb during X-rays in cases of suspected fracture?

    <p>To prevent misalignment of anatomical structures</p> Signup and view all the answers

    When imaging both joints on a single X-ray image is not possible, what should be done?

    <p>Take an anteroposterior image of the joint distal to the fracture site</p> Signup and view all the answers

    In adults, how is limb alignment typically ensured during digital CR and DDR imaging?

    <p>With the patient standing and weight-bearing</p> Signup and view all the answers

    What defines the anatomic axes of the femur and tibia?

    <p>The mid-diaphyseal line of each bone</p> Signup and view all the answers

    Which point should the mechanical axis pass through in the lower limb?

    <p>Center point of the hip joint and ankle joint</p> Signup and view all the answers

    What is the normal range for the femoral neck-shaft angle?

    <p>&gt;135°</p> Signup and view all the answers

    What is measured in millimeters to determine lateral mechanical axis deviation (MAD)?

    <p>Distance from the center of the joint</p> Signup and view all the answers

    What condition is present if the Coxa valga angle is greater than 135°?

    <p>Coxa vara</p> Signup and view all the answers

    How is the mechanical axis deviation measured in limb alignment assessment?

    <p>In millimeters from the center point of the knee joint</p> Signup and view all the answers

    In an Antero-Posterior (AP) Tibia/Fibula radiograph, where should the X-ray beam be centered?

    <p>At the mid-shaft of the tibia</p> Signup and view all the answers

    What is the correct patient positioning for a Lateral Tibia/Fibula radiograph?

    <p>Supine position</p> Signup and view all the answers

    What angle of rotation is required for the patient in a Lateral Oblique Projection for knee joint imaging?

    <p>45° rotation</p> Signup and view all the answers

    Where is the lateral malleolus located?

    <p>At the distal end of the fibula</p> Signup and view all the answers

    What should be equidistant from the image receptor in an AP Tibia/Fibula radiograph?

    <p>The lateral malleolus and fibula</p> Signup and view all the answers

    What should be parallel to an imaginary line joining the malleoli in a lateral Tibia/Fibula radiograph?

    <p>The X-ray beam</p> Signup and view all the answers

    What is the purpose of taking an antero-posterior oblique projection in radiography of the lower limb?

    <p>To examine the proximal tibio-fibula joint</p> Signup and view all the answers

    Why is the AP projection taken frequently in the weightbearing/standing position for knee joint imaging?

    <p>To offer more meaningful information about joint condition</p> Signup and view all the answers

    In lower limb radiography, when taking the AP projection, how is the patient positioned?

    <p>Supine with both legs extended</p> Signup and view all the answers

    What is the ideal limb rotation required for projecting the tibial condyle clear of the joint in lower limb radiography?

    <p>Medial rotation of 10–20°</p> Signup and view all the answers

    Which imaging modality is increasingly used to evaluate the proximal tibio-fibula joint?

    <p>MRI</p> Signup and view all the answers

    How is the X-ray beam aligned for an AP projection of the lower limb?

    <p>Centered on the fibula head</p> Signup and view all the answers

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