Tibia/Fibula Positioning Flashcards
What IR is used for all Tib-Fib views with the ankle?
14x17
What IR is used for all Tib-Fib views with the knee?
10x12
What is the SID for all Tib-Fib views?
40”
What are the structures seen for an AP tib-fib w/ ankle?
- Ankle & knee joints without rotation
- Proximal and distal articulations of the tibia & fibula moderately overlapped
- Fibular midshaft free of tibial superimposition
How is the patient positioned for an AP tib-fib w/ ankle?
- Patient supine or sitting on table
- Ankle, knee, & hip on the same longitudinal plane
- Foot & ankle dorsiflexed
- Femoral condyles parallel w/ IR
Where is the CR for an AP tib-fib w/ ankle?
Perpendicular to midshaft including both joints if possible
What SID can tib-fib ankle views be increased to include the knee joint?
48”
Why would you increase the SID to 48” for Tib-fib views of the ankle?
To include the knee joint
What are the structures seen for an AP tib-fib w/ knee?
- AP of knee including proximal tib-fib
- Open femorotibial joint space
- Patella completely superimposed on the femur
- Include distal femur and proximal tib-fib
How is the patient positioned for an AP tib-fib w/ knee?
- Patient is supine or sitting
- Ankle, knee, and hip are on the same longitudinal plane
- Foot and ankle dorsiflexed
- Femoral condyles parallel w/ IR
Where is the CR for an AP tib-fib w/ knee?
Centered to knee 1/2” distal to apex of patella
How many degrees is the CR angled for an AP tib-fib w/ knee?
5- degrees cephalic
What are the structures seen for a mediolateral tib-fib w/ ankle?
- Distal fibula lying over the posterior half of the tibia
- Slight overlap of the tibia on the proximal fibular head
- Moderate separation of the tibial and fibular shafts (except at articular ends)
How is the patient positioned for a mediolateral tib-fib w/ ankle?
- Patient rolled up on affected side to place lower leg in a lateral position
- Knee slightly flexed
- Foot and ankle dorsiflexed
- Femoral condyles perpendicular to IR
Where is the CR for a mediolateral tib-fib w/ ankle?
perpendicular to mid-shaft including both joints if possible
What are the structures seen for a mediolateral tib-fib w/ knee?
- Femoral condyles superimposed
- Patella in profile
- Fibular head and tibia slightly superimposed
- Include distal femur & proximal tib-fib
How is the patient positioned for a mediolateral tib-fib w/ knee?
- Patient rolled up on affected side to place lower leg in a lateral position
- Knee flexed 20-30 degrees
- Femoral condyles perpendicular to IR
Where is the CR for a mediolateral tib-fib w/ knee?
1” distal to medial epicondyle
How many degrees is the CR angled for a mediolateral tib-fib w/ knee?
5-7 degrees cephalic
