Positioning - Ankle/ Tib-fib
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19 Terms
Where does the CR enter for the AP and lateral projection of the lower leg, tib/fib?
Midpoint of the lower leg
How are the condyles positioned for an AP projection and lateral of the tib/fib?
AP- parallel to IR, lateral- perpendicular
What is done if the lower leg is too long for the 14 × 17 IR?
Take an image of the joint furthest from the injury site, 10×12 of ankle jt, 14×17 of knee jt
Where does the CR enter for the AP projection of the ankle?
Midway between the malleoli
Is the intermalleolar line parallel to the IR on an AP projection of the ankle? Explain.
No, the lateral malleolus sits 15 degrees posterior to the medial malleolus
Where does the CR enter for the AP Mortise projection of the ankle?
Midway between the malleoli
How is the leg and foot positioned for the AP Mortise of the ankle? Describe the intermalleolar line.
Whole leg and foot internally rotated 15-20 degrees. Line is parallel to IR
Do you dorsiflex the foot for the AP mortise projection of the ankle? Explain.
No, so the base of the 5th metatarsal ins’t superimposed
What is best demonstrated on the AP mortise projection of the ankle?
Open ankle mortise
What is the degree of oblique for the AP oblique projection - medial rotation of the ankle?
45 degrees
Where does the CR enter for the AP oblique projection of the ankle?
Midway between the malleoli
What joint is best demonstrated on the AP oblique projection of the ankle?
Distal tib/fib joint
Where does the CR enter for the lateral position of the ankle?
Medial malleolus
What type of projection is the lateral ankle?
Mediolateral
Is the foot dorsiflexed on the lateral ankle projection?
Yes
If positioned correctly, where is the distal fibula located for the lateral ankle projection?
Superimposed on the posterior half of the tibia
What is the joint classification of the ankle joint?
D/S/Saddle
What is the joint classification of the proximal tib/fib joint?
D/S/Gliding
What is the joint classification of the distal tib/fib joint?
Amphiarthtrodial/ Fibrous