Foot

Question 1

Projections for the foot

Answer 1

•AP/AP Axial Projections
•AP Oblique Projections (Medial Rotation)
•AP Oblique Projections (Lateral Rotation)
•Lateral Projection (Lateromedial)
•Lateral Projection (Mediolateral)
•Lateral Projection (Weight Bearing Method)
•AP Axial Projection (Weight Bearing Method)
•AP Axial Projection (Weight Bearing Composite Method)

Question 2

AP/AP Axial Projections
Central Ray

Answer 2

Perpendicular or
10° posteriorly

Question 3

Structures Shown

• MT & Tarsal (perpendicular);
  TMT joint (10°)

Answer 3

AP/AP Axial Projections

Question 4

Purpose:
- For localizing foreign bodies
- Location of fragments in fx of metatarsals & anterior tarsals
- General surveys of the foot Note:
- 10° angulation: reduces foreshortening of
metatarsals

Answer 4

AP/AP Axial Projections

Question 5

AP Oblique Projections (Medial Rotation)
Part Position

Answer 5

• Supine
  Patient Position:
• Knee flexed; leg rotated medially; plantar surface of foot 30° to IR

Question 6

AP Oblique Projections (Medial Rotation)
Central Ray

Answer 6

Perpendicular to 3rd MTP base

Question 7

Structures Shown
•- Calcaneus
- Fourth and fifth
metatarsals
- Lateral
cuneiform
- Talus
- Navicular bone.
- Sinus tarsi and
cuboid (well demon-strated)

Answer 7

AP Oblique Projections (Medial Rotation)

Question 8

AP Oblique Projections (Lateral Rotation)
Part Position

Answer 8

• Supine
  Patient Position:
• Knee flexed; leg rotated laterally;
  plantar surface of foot 30° to IR

Question 9

AP Oblique Projections (Lateral Rotation)
Central Ray

Answer 9

Perpendicular to 3rd MT base

Question 10

Structures Shown
- Interspaces between the first
and second metatarsals and between the medial and intermediate cuneiforms
- Navicular bone (more clearly
demonstrated)

Answer 10

AP Oblique Projections (Lateral Rotation)

Question 11

Lateral Projection (Lateromedial)
Central Ray

Answer 11

Perpendicular to 3rd MT base

Question 12

Structures Shown

•A true lateral image of the
foot, ankle joint, and distal ends of the tibia and fibula

Answer 12

Lateral Projection (Lateromedial)

Question 13

Lateral Projection (Mediolateral)
Part Position

Answer 13

• Lateral recumbent
  Part Position:
• Dorsiflex the foot to form a 90-degree
  angle with the lower leg
• Elevate the patient’s knee enough to place the patella perpendicular to the horizontal plane

Question 14

Lateral Projection (Mediolateral)
Central Ray

Answer 14

Perpendicular to the 3rd MT base

Question 15

Structures Shown

• For localizing foreign body
• Degree of anterior &
  posterior displacement of fx

Answer 15

Lateral Projection (Mediolateral)

Question 16

Lateral Projection (Weight Bearing Method)
Central Ray

Answer 16

Perpendicular to a point just above
the base of the 3rd metatarsal

Question 17

Structures Shown

• Status of longitudinal
  arch (pes planus);
  Bohler’s critical angle (20-40°)
• angle between superior apex of mid-calcaneus to anterior process of calcaneus

Answer 17

Lateral Projection (Weight Bearing Method)

Question 18

AP Axial Projection (Weight Bearing Method)
Central Ray

Answer 18

• Angled 10 degrees toward heel
  (optimal)
• Minimum of 15
  degrees usually necessary to allow room for tube and patient to stand
• Positioned between feet at
  the level of the base of the third metatarsal

Question 19

Structures Shown

• Accurate evaluation &
  comparison of
  MT & tarsals
• Hallux valgus &
  lisfranc injury

Answer 19

AP Axial Projection (Weight Bearing Method)

Question 20

AP Axial Projection (Weight Bearing Composite Method)
Part Position

Answer 20

AP Axial Projection (Weight Bearing Composite Method)

Question 21

AP Axial Projection (Weight Bearing Composite Method)
Central Ray

Answer 21

• 15° posteriorly (1st exposure)
  ● 3rd MTP base - 25° anteriorly
  (2nd exposure)
  •Level of lateral
  malleolus

Question 22

What projection will show the full outline of the foot?

Answer 22

AP Axial Projection (Weight Bearing Composite Method)