Radiology: X-ray Imaging of First CMC Joint
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Radiology: X-ray Imaging of First CMC Joint

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Questions and Answers

What is the primary issue with the radiograph in the example?

  • The central ray is not angled correctly to capture the joint
  • The radiograph is not taken at the correct angle to show the joint
  • The soft tissue of the palm is obstructing the view of the first CMC joint (correct)
  • The first CMC joint is not visible due to the patient's handedness
  • What modification would be beneficial to show the joint in this patient?

  • Temporal modification of the central ray
  • Rafert modification of the central ray
  • Radial modification of the central ray
  • Long-Rafert or Lewis modification of the central ray (correct)
  • What is the significance of the arrow in the radiograph example?

  • It points to the first CMC joint
  • It marks the edge of the radiograph
  • It highlights the soft tissue of the palm (correct)
  • It indicates the direction of the central ray
  • What is the main goal of modifying the central ray in this case?

    <p>To improve the visibility of the first CMC joint</p> Signup and view all the answers

    What is the primary advantage of using the Long-Rafert or Lewis modification?

    <p>It allows for better visualization of the first CMC joint</p> Signup and view all the answers

    What is the name of the method used for the AP Oblique Projection?

    <p>Norgaard Method</p> Signup and view all the answers

    In which direction is the wrist positioned for the PA Axial Projection using the Rafert-Long method?

    <p>Ulnar deviation</p> Signup and view all the answers

    What is the name of the series used for the PA and PA Axial wrist projections?

    <p>Rafert-Long Series</p> Signup and view all the answers

    What is the type of projection used for the Stecher Method?

    <p>PA Axial Projection</p> Signup and view all the answers

    What is the name of the bone being projected in the given images?

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

    What is the primary purpose of adjusting the central ray angle in the radiographic examination of the wrist?

    <p>To achieve a more direct view of the wrist bones</p> Signup and view all the answers

    What is the primary difference between radiographs (A) and (B)?

    <p>The angle of the central ray</p> Signup and view all the answers

    What is the primary purpose of the Folio method in radiology?

    <p>To diagnose ulnar collateral ligament (UCL) tears in the MCP joint</p> Signup and view all the answers

    What is the purpose of using a 10-degree cephalad angle in radiograph (B)?

    <p>To reduce the distortion of the wrist bones on the radiograph</p> Signup and view all the answers

    What is the significance of the 13-degree difference in the MCP joint angle between the left and right sides?

    <p>It is a sign of UCL tear</p> Signup and view all the answers

    What is the significance of the radiographs being from the same patient?

    <p>It ensures that the radiographic images are not affected by patient variables</p> Signup and view all the answers

    What is the primary advantage of using a PA axial view in radiograph (B)?

    <p>It provides a more accurate representation of the wrist bones</p> Signup and view all the answers

    What is the purpose of the PA Oblique projection in hand radiology?

    <p>To evaluate the MCP joint</p> Signup and view all the answers

    What is the importance of the marker on the radiograph?

    <p>To identify the radiographic view</p> Signup and view all the answers

    What is the significance of the metacarpal index in hand radiology?

    <p>It assesses the length of the metacarpal bones</p> Signup and view all the answers

    What is the role of the flexible strip in the Folio method?

    <p>To hold the hand in place</p> Signup and view all the answers

    What is the purpose of the Lateral projection in hand radiology?

    <p>To assess the lateral aspect of the hand</p> Signup and view all the answers

    What is the significance of the 20-degree angle measurement in the UCL tear?

    <p>It indicates the severity of the tear</p> Signup and view all the answers

    What is the importance of the hand position in the PA projection?

    <p>It should be placed on the flat surface</p> Signup and view all the answers

    What is the role of the radiographic markers in the evaluation of hand anatomy?

    <p>To identify the radiographic view</p> Signup and view all the answers

    What is the name of the projection method used to visualize the carpal canal?

    <p>Gaynor-Hart method</p> Signup and view all the answers

    What is the orientation of the central ray in a tangential carpal canal projection?

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

    What is the purpose of modifying the central ray in a carpal canal projection?

    <p>To demonstrate the carpal canal</p> Signup and view all the answers

    What is the name of the anatomical structure visualized in a tangential carpal canal projection?

    <p>Carpal canal</p> Signup and view all the answers

    What is the benefit of using a tangential projection for the carpal canal?

    <p>It provides a unique view of the carpal canal</p> Signup and view all the answers

    Study Notes

    Radiograph Projections

    • A typical repeat radiograph may obscure the first CMC joint, which can be improved by using the Long-Rafert or Lewis modification of the central ray.

    Axial CT Scan

    • An axial CT scan through the distal carpals can help well visualize the CMC joint.

    Folio Method

    • The Folio method is used to diagnose a tear in the ulnar collateral ligament (UCL) of the first metacarpophalangeal (MCP) joint, also known as "skier's thumb".
    • Key points to note in this projection include:
      • Evidence of proper alignment and the presence of a marker without anatomy.
      • The hand in a PA projection without rotation.
      • The first metacarpal and first MCP joint.
      • The ulnar side of the wrist and the soft tissues around it.
      • The thumb in the center of the image.
      • Trabecular bone details and surrounding soft tissues.

    Hand PA Projection

    • Evaluation criteria for a hand PA projection include:
      • Evidence of proper alignment and the presence of a marker without anatomy.
      • Anatomy from the fingertips to the distal radius and ulna.
      • Fingers slightly separated without soft tissue overlap.
      • No hand rotation.
      • The MCP and IP joints are open, indicating that the hand is placed on the receiver flat.
      • Trabecular bone details and surrounding soft tissues.

    PA Oblique Projection

    • No specific details mentioned.

    Lateral Projection

    • No specific details mentioned.

    Lateromedial in Flexion

    • No specific details mentioned.

    AP Oblique Projection (Norgaard Method)

    • No specific details mentioned.

    Scaphoid PA Axial Projection (Stecher Method)

    • No specific details mentioned.

    Rafert-Long Method Scaphoid Series

    • PA and PA axial wrist in ulnar deviation are used in this series.
    • Radiographs are all from the same patient.

    Carpal Bridge Tangential Projection

    • No specific details mentioned.

    Carpal Canal Tangential Projection (Gaynor-Hart Method)

    • No specific details mentioned.

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    Description

    This quiz is about radiography techniques, specifically the use of Long-Rafert or Lewis modification to visualize the first CMC joint on a radiograph.

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