Wrist & Forearm RAD 1 Positioning Flashcards
What is the SID used for Wrist & Forearm?
40”
What IR is used for Wrist positioning?
10 x 12
Where is the CR located for PA Wrist?
Perpendicular to Mid-carpal
What structures are seen in PA Wrist?
- PA projection of carpals, distal radius & ulna, and proximal metacarpals
- Open radioulnar joint space
- No rotation in carpals, metacarpals, or radius
- slight rotation of the ulna
Where is the CR located for 45 degree PA Lateral Oblique Wrist?
Perpendicular to midcarpal area, entering just distal to the radius
What structures are seen for a 45 degree PA Lateral Oblique Wrist?
- Trapezium is best demonstrated
- Distal half of scaphoid is seen
- Slight overlap of distal radius, ulna, and other carpals
- Open trapeziotrapezoid & scaphiotrapezial joint space
- Demonstrates carpals on the lateral side of wrist
Where is CR located for 45 degree PA Medial Oblique Wrist?
Perpendicular to midcarpal ares, entering just distal to the radius
What structures are seen for a 45 degree PA Medial Oblique Wrist?
- Demonstrates carpals on the medial side of the wrist
- Pisiform, lunate, and triquetrum is seen
Where is the CR located for a 45 degree AP Medial Oblique Wrist?
Perpendicular to midcarpal area, entering the anterior surface of the wrist
What structures are seen in a 45 degree AP Medial Oblique Wrist?
- Demonstrates carpals on the medial side of the wrist
- Pisiform is best demonstrated
- No superimposition of the triquetrum, hook of hamate, and pisiform
Where is the CR located for a Lateromedial wrist
Perpendicular to the wrist joint
What sturctures are seen in a Lateromedial wrist?
- Superimposed distal radius and ulna
- Superimposed metacarpals
- Demonstrates any anterior/posterior displacement due to a fx and localization of any foreign body
Where is the CR located for a PA wrist ulnar deviation?
Perpendicular to scaphoid
What structures are seen in a PA wrist ulnar deviation?
- Scaphoid best demonstrated with no superimposition
- No rotation of carpals, metacarpals, radius, or ulna
Where is the CR located for a PA Axial wrist projection for scaphoid?
20 degrees cephalic entering at the scaphoid
What structures are seen in a PA Axial wrist projection for scaphoid?
- Scaphoid best demonstrated without superimposition
- No rotation of carpals, metacarpals, radius, or ulna
What is another name for the PA Axial wrist projection for scaphoid?
Stretcher method
What does the bridgeman method suggest for a PA Axial wrist projection for scaphoid?
To place wrist in ulnar deviation
Where is the CR located for a tangential wrist?
1” distal to the base of the 3rd metacarpal
What structures are seen for a tangential wrist?
- Demonstrates carpal canal
- Palmar aspect and tubercle of trapezium seen
- Visualizes the scaphoid, capitate, hook of hamate, triquetrum, and entire pisiform
- Pisiform in profile and free of superimposition
- Helpful in identifying fractures of the hook of hamates, pisiform, and trapezium
What is another name for the tangential wrist?
Carpal canal aka gaynor-hart method
What IR is used for a forearm?
14 x 17
Where is the CR located for an AP forearm?
Perpendicular to mid-shaft
What structures are seen in a AP forearm?
- Slight superimposition of radial head, neck, and tuberosity over proximal ulna
- Demonstrates entire forearm, both wrist and elbow joint
- Open radioulnar space
- No elongation for foreshortening of the humeral epicondyles
Where is the CR located for an lateromedial forearm?
Perpendicular to mid-shaft
What structures are seen in a lateromedial forearm?
- Demonstrates the entire forearm, wrist, and elbow joint
- Superimposition of distal radius and ulna
- Superimposition of radial head over the coronoid process
- Superimposed humeral epicondyles
