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633: Human Imaging II > Knee > Flashcards

Flashcards in Knee Deck (22):
1

Radiographs should be ordered after trauma to the knee if there is any of what 4 symptoms present?

- Joint effusion after direct blow or fall
- Inability to walk without limping
- Palpable tenderness over patella or fibular head
- Inability to flex knee to 90°

2

Should radiographs be ordered if a patient had twisting injury and is able to walk with no effusion present?

No

3

Isolated meniscal tears are present with what symptoms?

- Intermittent clicking and eventually chronic blocking or locking of knee joint motion
- Effusion
- Pain

4

What is the imaging of choice for evaluating menisci?

MRI

5

On an MRI menisci are seen as ___ signal intensity. Tears are seen as ____ signal intensity.

low (dark)

high (light)

6

In what direction are mensical tears most commonly oriented?

vertically

7

If there is a longitudinal extension of the vertical meniscus tear what is it called?

a bucket handle tear

8

Meniscus tears typically occur in a horizontal orientation due to what?

degenerative changes in older adults

9

What is the clinical presentation of a collateral ligament tear?

Pain, joint effusion, and instability

10

The LCL is injured from a ____ force

varus

11

The MCL is injured from a ____ force

valgus

12

What is the unhappy triangle?

Tears of the MCL, ACL, and medial meniscus

13

What is the imaging of choice for collateral ligament tears?

coronal T2-weight MRI

14

In a T2-weighted MRI the collateral ligaments appear ____.

dark
low signal intensity

15

Sports related ACL injuries occur at a rate of about how many per year in the US?

200,000

16

Women tend to experience ACL injuries up to __ times more often than men participating in same the sport

8

17

What is the MOI for a PCL tear?

external forces that strike the anterior aspect of the knee (such as in dashboard injuries)

18

What is the MOI for an ACL tear?

non-contact forces that place great valgus and rotary stresses on knee.

Such as when an athlete suddenly decelerates, turns, and hears the classic “pop” of rupture

19

Dynamic LE valgus is a combination of what 3 motions at the hip, knee, and ankle?

Hip: adduction and internal rotation
Knee: tibial abduction, tibial external rotation and anterior translation
Ankle eversion

20

How can radiographs evaluate cruciate ligament tears?

When there is associated avulsion fractures

21

What is the imaging of choice for cruciate ligament tears?

Sagittal T1-weighted MRI

22

What are the 2 clinical decisions rules for the knee?

Ottawa and Pittsburg