Question

Which of the following special projections can be used to demonstrate the scaphoid carpal bone?

1. PA projection (ulnar deviation position)
2. PA axial projection (Stecher method)
3. Tangential projection (Gaynor-Hart method)

Answer 1

The special projections used to demonstrate the scaphoid carpal bone are PA projection (ulnar deviation position), PA axial projection (Stecher method), and tangential projection (Gaynor-Hart method).

Step-by-step explanation:

The scaphoid carpal bone can be demonstrated using the following special projections:

1. PA projection (ulnar deviation position): This projection is used to visualize the scaphoid bone in a normal hand. The hand is positioned with the palm down and the ulnar side of the hand (pinkie side) is tilted towards the thumb side. This projection helps reduce overlap of the other carpal bones and highlights the scaphoid bone.
2. PA axial projection (Stecher method): This projection is used to better visualize the scaphoid bone in cases where there is suspected fracture or injury. The hand is positioned with the palm down and the beam of the X-ray machine is angled 20-30 degrees towards the wrist. This helps to project the scaphoid bone more clearly.
3. Tangential projection (Gaynor-Hart method): This projection is used to demonstrate the scaphoid bone when other projections are inconclusive. The hand is positioned with the palm down and the beam of the X-ray machine is angled towards the shoulder. This creates a tangential view of the scaphoid bone, allowing for better visualization of any abnormalities.