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Protocols - Lower Extremity > Knee > Flashcards

Knee Flashcards

1
Q

At what degree of flexion is the patella demonstrated on the patellar surface?

A

20 degrees

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2
Q

At what degree of flexion is the patella demonstrated between the patellar surface and the intercondylar fossa?

A

30-70 degrees

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3
Q

At what degree of flexion is the patella demonstrated within the intercondylar fossa?

A

90 degrees

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4
Q

What is the positional error if the medial femoral condyle is larger and the tibia superimposes more than 1/2 of the fibular head?

A

External rotation

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5
Q

What is the positional error if the lateral femoral condyle is larger and the tibia superimposed less than 1/2 of the fibular head?

A

Internal rotation

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6
Q

What is patellar subluxation?

A

The patella may be situated more laterally than normal

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7
Q

What tube angulation should be used for a patient thickness of 18cm or less?

A

5 degrees caudal

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8
Q

What tube angulation should be used for a patient thickness of 19-24cm

A

Perpendicular (no angle)

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9
Q

What tube angulation should be used for a patient thickness of 25cm or more?

A

5 degrees cephalad

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10
Q

How do you identify if the cephalad angle was too great?

A

Fibular head is foreshortened and demonstrated more than .5” distal to plateau

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11
Q

How do you identify if the causes angle was too great?

A

Fibular head will be elongated and demonstrated less than .5” distal to plateau

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12
Q

What compartment of the knee is narrowed with a valgus deformity?

A

Lateral compartment

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13
Q

What compartment of the knee is narrowed with a varus deformity?

A

Medial compartment

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14
Q

How do you identify a properly positioned lateral knee?

A

•tibia superimposes 1/2 of fib head
•anterior and posterior margins of the medial and lateral femoral condyles are aligned
•open patella femoral joint space

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15
Q

What degree of flexion is needed for a lateral knee?

A

10-15
20-30

?

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16
Q

Where are the anterior and posterior suprapatellar fat pads located?

A

Anterior to the patellar surface of the distal femur

17
Q

What are the anterior and posterior suprapatellar fat pads seperated by?

A

Suprapatellar bursa

18
Q

Lateral knee
What is the positional error when the medial condyle (adductor tubercle) is posterior to lateral condyle, and the fibular head is superimposed on the tibia?

A

Internal rotation

19
Q

Lateral knee
What is the positional error when the medial condyle (adductor tubercle) is anterior to the lateral condyle and the fibular head is free of tibial superimposition?

A

External rotation

20
Q

Lateral knee
What degree of angulation should be used for a patient with a wide pelvis?

A

7 degrees cephalad

21
Q

Lateral knee
What degree of angulation should be used for a patient with an average pelvis?

A

5 degrees cephalad

22
Q

What projection was completed if the head, neck and shaft of the fibular are aligned with the anterior edge of the tibia and the medial femoral condyle is in profile?

A

AP oblique - external rotation

23
Q

What projection was completed if the lateral femoral condyle is in profile and the fibular head is seen free of superimposition?

A

AP oblique - internal rotation

24
Q

What is the positional error of a medial oblique knee if the tibia partially superimposed the fibular head?

A

Insufficient internal rotation

25
Q

What is the positional error of a medial oblique knee if there is excessive femoral condyle superimposition?

A

Excessive internal rotation

26
Q

What is the positional error of a lateral oblique knee if the fibular head is demonstrated without full tibial superimposition?

A

Insufficient external rotation

27
Q

What is the positional error of a lateral oblique knee where the fibular head is not aligned with the anterior edge of the tibia but seen posterior?

A

Excessive external rotation

28
Q

What tangential projection of the patella demonstrates the lateral femoral condyle slightly higher than the medial condyle?

A

Inferosuperior projection

29
Q

What tangential projection of the patella demonstrates the femoral condyles at equal height?

A

Settegast method

30
Q

What is the accurate amount of knee flexion for the tangential patella inferosuperior projection?

A

45 degrees

31
Q

What is the accurate amount of knee flexion for a tangential patella projection with the Settegast method?

A

90 degrees

32
Q

What is the positional error if the femoral condyles are equal height for the inferosuperior tangential patella?

A

Knee was flexed more than 45 degrees

Protocols - Lower Extremity (9 decks)

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