Knee Review Flashcards
The medial oblique knee will require the intercondylar plane of the femur to be –1– degrees from the IR.
45 degrees
Which of the following criteria is true for the lateral oblique knee position?
The tibia and fibula will be superimposed
The intercondylar fossa is best demonstrated when the –1–.
CR is perpendicular to the tibia
The sunrise or axial image of the patella may best demonstrate the presence of –1–.
vertical fractures
The CR should be directed to a point –1– for an AP projection of the knee.
1/2 inch below the patellar apex
The erect tangential axial patella will require a –1– CR projection.
Superoinferior
The –1– Method may use a curved or elevated cassette to demonstrate the intercondylar fossa.
Beclere
The weight bearing AP projection knee will not require the use of a CR angle so the –1–.
Degenerative joint changes are less distorted.
When positioning a patient in the Camp Coventry Method and the degree of leg flexion is 43 degrees, the CR degree and direction should be –1–.
43 degrees caudal
The original Settegast Method requires –1–.
Hyperflexion of the affected knee
The lateral knee will best demonstrate which of the following?
The open patellofemoral joint space
The lateral patella should always be performed prior to the –1– in a patella series.
Axial projection
What is the proper degree of flexion for the lateral knee position/projection?
20-30 degrees
For demonstration of the axial patella the CR should remain –1–.
Parallel to the patella
The Holmblad Method is used to demonstrate –1–.
Intercondylar fossa of the femur
The posterior surface of the knee area is called –1–.
popiteal
This device should be used on patient parts that measure greater than 10 cm.
grid
Why is the PA projection utilized for imaging the patella rather than an AP?
It puts the patella closer to the IR to decrease mag and it increases recorded detail.
List 3 Method names/views that demonstrate the axial patella:
- Merchant
- Settegast
- Houghston
List 2 important instructions to give patients when performing weight bearing knee exams:
- Take your shoes off
2. Stand with equal weight on both feet
Which routine position/projection of the knee will demonstrate a separation of the tibia and fibula?
AP Oblique internal rotation
List and explain the CR angulations utilized when performing the AP projection:
19 to 24 cm (avg. pelvis)- perpendicular
greater than 24 cm (large pelvis)- 3-5 degrees cephalic
less than 19 cm (thin pelvis)- 3-5 degrees caudal
*to open joint spaces
The purpose of angling the CR 5-7 degrees cephalic for the lateral projection knee radiograph is to –1–.
open up to joint space because the medial condyle hangs 5-7 degrees lower than the lateral condyle and to superimpose condyles.
What is the degree of obliquity for an oblique knee?
45 degrees
