Wrist & Forearm

Question 1

What is the SID used for Wrist & Forearm?

Answer 1

40”

Question 2

What IR is used for Wrist positioning?

Answer 2

10 x 12

Question 3

Where is the CR located for PA Wrist?

Answer 3

Perpendicular to Mid-carpal

Question 4

What structures are seen in PA Wrist?

Answer 4

• 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

Question 5

Where is the CR located for 45 degree PA Lateral Oblique Wrist?

Answer 5

Perpendicular to midcarpal area, entering just distal to the radius

Question 6

What structures are seen for a 45 degree PA Lateral Oblique Wrist?

Answer 6

• 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

Question 7

Where is CR located for 45 degree PA Medial Oblique Wrist?

Answer 7

Perpendicular to midcarpal ares, entering just distal to the radius

Question 8

What structures are seen for a 45 degree PA Medial Oblique Wrist?

Answer 8

• Demonstrates carpals on the medial side of the wrist
• Pisiform, lunate, and triquetrum is seen

Question 9

Where is the CR located for a 45 degree AP Medial Oblique Wrist?

Answer 9

Perpendicular to midcarpal area, entering the anterior surface of the wrist

Question 10

What structures are seen in a 45 degree AP Medial Oblique Wrist?

Answer 10

• Demonstrates carpals on the medial side of the wrist
• Pisiform is best demonstrated
• No superimposition of the triquetrum, hook of hamate, and pisiform

Question 11

Where is the CR located for a Lateromedial wrist

Answer 11

Perpendicular to the wrist joint

Question 12

What sturctures are seen in a Lateromedial wrist?

Answer 12

• Superimposed distal radius and ulna
• Superimposed metacarpals
• Demonstrates any anterior/posterior displacement due to a fx and localization of any foreign body

Question 13

Where is the CR located for a PA wrist ulnar deviation?

Answer 13

Perpendicular to scaphoid

Question 14

What structures are seen in a PA wrist ulnar deviation?

Answer 14

• Scaphoid best demonstrated with no superimposition
• No rotation of carpals, metacarpals, radius, or ulna

Question 15

Where is the CR located for a PA Axial wrist projection for scaphoid?

Answer 15

20 degrees cephalic entering at the scaphoid

Question 16

What structures are seen in a PA Axial wrist projection for scaphoid?

Answer 16

• Scaphoid best demonstrated without superimposition
• No rotation of carpals, metacarpals, radius, or ulna

Question 17

What is another name for the PA Axial wrist projection for scaphoid?

Answer 17

Stretcher method

Question 18

What does the bridgeman method suggest for a PA Axial wrist projection for scaphoid?

Answer 18

To place wrist in ulnar deviation

Question 19

Where is the CR located for a tangential wrist?

Answer 19

1” distal to the base of the 3rd metacarpal

Question 20

What structures are seen for a tangential wrist?

Answer 20

• 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

Question 21

What is another name for the tangential wrist?

Answer 21

Carpal canal aka gaynor-hart method

Question 22

What IR is used for a forearm?

Answer 22

14 x 17

Question 23

Where is the CR located for an AP forearm?

Answer 23

Perpendicular to mid-shaft

Question 24

What structures are seen in a AP forearm?

Answer 24

• 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

Question 25

Where is the CR located for an lateromedial forearm?

Answer 25

Perpendicular to mid-shaft

Question 26

What structures are seen in a lateromedial forearm?

Answer 26

• 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