knee and patella

Question 1

rotate leg ________________ for a true AP knee (until inter-epicondylar line is parallel)

Answer 1

internally 3-5 degrees

Question 2

Rotate leg internally 3-5 degrees for a true AP knee (until _________________)

Answer 2

inter-epicondylar line is parallel

Question 3

kVp range for knee

Answer 3

65-80 kVp

Question 4

where do we center the CR for an AP knee?

Answer 4

aligned parallel with articular facets (tibial plateau)

1/2 inch distal to apex of patella

Question 5

what is the CR angle for thinner patients on an AP knee?

Answer 5

5 degrees caudad

Question 6

what is the CR angle for average patients on an AP knee?

Answer 6

perpendicular to IR

Question 7

what is the CR angle for thicker patients on an AP knee?

Answer 7

5 degrees cephalic

Question 8

Knee flexed ___________ for a lateral (mediolateral) knee x-ray

Answer 8

20-30 degrees

Question 9

where is the CR aligned for a lateral recumbent lateral knee?

Answer 9

Angle CR 5-7 deg cephalad for lateral recumbent projection

Question 10

where is the CR directed for a lateral recumbent lateral knee?

Answer 10

1 inch distal to medial epicondyle

Question 11

for a lateral (mediolateral) knee, the femoral epicondyles are _______________ and plane of patella is _________________

Answer 11

directly superimposed; perpendicular to the IR

Question 12

for a medial oblique knee, intercondylar line should be ___________

Answer 12

45 degrees to plane of IR

Question 13

for a medial oblique knee, the ________ should be rotated

Answer 13

entire leg

Question 14

for a medial oblique knee, angle the CR ________

Answer 14

0 degrees (perpendicular to IR)

Question 15

where is the CR directed in a medial oblique knee?

Answer 15

0 degree angulation/perpendicular; 1/2 inch distal to apex of patella

Question 16

where is the CR direct in a lateral oblique knee?

Answer 16

0 degree angulation/perpendicular; 1/2 inch distal to apex of patella

Question 17

what is the knee flexion angle when doing a Camp Coventry x-ray?

Answer 17

40-50 degree flexion (with support under ankle)

Question 18

what is another name for a Camp Coventry x-ray?

Answer 18

PA Axial “tunnel view”

Question 19

what is the knee flexion angle when doing a Beclere x-ray?

Answer 19

40-45 degrees

Question 20

where is the CR in a Camp Coventry x-ray?

Answer 20

Perpendicular to lower leg (40-50 degree caudad to match degree of flexion)

Question 21

what is the CR angulation in a Beclere x-ray?

Answer 21

Perpendicular to lower leg (40-45 degree cephalad to match degree of flexion)

Question 22

where is the CR directed in a Beclere x-ray?

Answer 22

1/3 inch distal to apex of patella

Question 23

what is the CR angle in a PA patella?

Answer 23

perpendicular to IR

Question 24

where is the CR directed in a PA patella?

Answer 24

mid-patella (approx. mid-popliteal crease)

Question 25

what is the CR angle in a lateral patella?

Answer 25

perpendicular to IR

Question 26

where is the CR directed in a lateral patella?

Answer 26

mid-patellofemoral joint

Question 27

what is the knee flexion of a lateral patella?

Answer 27

only 5-10 degrees