Knee

Question 1

Projections of the knee

Answer 1

•AP Projection
•PA Projection
•Lateral Projection Mediolateral
•AP Oblique Projection (Medial Rotation)
•AP Oblique Projection (Lateral Rotation)
•Weight-Bearin g Method AP Bilateral Projection Leach-Gregg- Siber
•Rosenberg Method PA Weight-Bearin g Standing Flexion

Question 2

AP Projection
Part Position

Answer 2

• Supine
  Part Position:
• Femoral epicondyles parallel to IR
• leg 5° inward (places interepicondylar
  line parallel to IR)

Question 3

AP Projection
Central Ray

Answer 3

Entrance: 0.5 in. inferior to patellar apex Angulation:dependin g on the measurement between ASIS & table top
- 3-5°caudad (<19 cm; thin pelvis)
- perpendicular (19-24 cm)
- 3-5°cephalad (>24 cm; large pelvis)

Question 4

Knee joint space

Answer 4

AP Projection
PA Projection
Lateral Projection Mediolateral
Weight-Bearin g Method AP Bilateral Projection Leach-Gregg- Siber

Question 5

PA Projection
Part Position

Answer 5

• Prone
  Part Position:
• femoral epicondyles parallel to IR
• leg 5o inward (places interepicondylar
  line parallel to IR)

Question 6

PA Projection
Central Ray

Answer 6

Entrance: 0.5 in. inferior to patellar apex
Angulation: 5-7°caudad

Question 7

Lateral Projection Mediolateral
Part Position

Answer 7

• Lateral recumbent
  Part Position:
• Knee flexed 20-30° (relax muscle &
  shows maximum volume of joint cavity) or flexed <10° (for new or unhealed patellar fx)
• femoral epicondyle

Question 8

Lateral Projection Mediolateral
Central Ray

Answer 8

Entrance: 1 in. distal to medial epicondyle Angulation: 5-7° cephalad

Question 9

AP Oblique Projection (Medial Rotation)
Part Position

Answer 9

• Supine
  Part Position:
• leg rotated 45° medially
• hip of a ected side elevated

Question 10

AP Oblique Projection (Medial Rotation)
Central Ray

Answer 10

Entrance: 0.5 in. inferior to patellar apex
Angulation: depending on the measurement between ASIS & table top
- 3-5°caudad (<19 cm)
- Perpendicular (19-24 cm)
- 3-5°cephalad (>24 cm)

Question 11

• Proximal tibiofibular
  joint; fibular head

Answer 11

AP Oblique Projection (Medial Rotation)

Question 12

AP Oblique Projection (Lateral Rotation)
Part Position

Answer 12

• Supine
  Part Position:
• Leg rotated 45° laterally
• hip of una ected side elevated

Question 13

AP Oblique Projection (Lateral Rotation)
Central Ray

Answer 13

Entrance: 0.5 in inferior to patellar apex
Angulation: 5o cephalad

Question 14

• Tibial plateaus
• medial femoral
  & tibial condyles

Answer 14

AP Oblique Projection (Lateral Rotation)

Question 15

Weight-Bearin g Method AP Bilateral Projection Leach-Gregg- Siber
Central Ray

Answer 15

Entrance: 0.5 in. inferior to patellar apex
Angulation: Horizontal

Question 16

Purpose:
- To reveal narrowing of
knee joint space
- To evaluate varus & valgus
deformities & degenerative joint disease

Answer 16

Weight-Bearin g Method AP Bilateral Projection Leach-Gregg- Siber

Question 17

Rosenberg Method
PA Weight-Bearin g Standing Flexion
Part Position

Answer 17

• Upright
  Part Position:
• Facing vertical IR - anterior surface of
  flexed knee against
  IR
• femur 45° to IR

Question 18

Rosenberg Method
PA Weight-Bearin g Standing Flexion
Central Ray

Answer 18

Entrance: 0.5 in. inferior to patellar apex
Angulation: Horizontal or 10° caudad

Question 19

Purpose: Useful for evaluating joint space narrowing & demonstrating articular cartilage disease

Answer 19

Rosenberg Method
PA Weight-Bearin g Standing Flexion