Ankle and Lower Leg Review Flashcards
When performing the AP projection lower leg, the CR should be directed to the –1–.
mid-shaft of the tibia
When an AP projection, Mortise of the ankle is performed, the leg should be rolled approximately –1– degrees.
15-20 degrees
When the lateral or external oblique position of the lower leg is performed the tibia and fibula will –1–.
superimpose
A line drawn through the medial malleolus to the IR when the ankle is placed laterally should be –1– to the IR.
perpendicularr
Which type of joint is the ankle?
hinge
The lateral malleolus is located on the –1–.
distal fibula
What 3 structures make up the mortise joint?
- Distal Tibia
- Talus
- Distal Fibula
The CR should be directed to the –1– for a lateral projection ankle.
medial malleolus
Which position/projection (s) of the ankle should be performed to demonstrate the possible presence of ligaments tears.
AP ankle with inversion and AP ankle with eversion
How should the foot/ankle be placed to open the tibiotalar articulation?
dorsiflexion
The routine medial oblique projection of the ankle requires –1– degrees of rotation.
45 degrees
What specific structure should be present on all ankle radiographs in order to demonstrate a Jones Fracture if present?
The tuberosity of the 5th metatarsal
If density differences are present on a lower leg radiograph, specifically explain what can be done to correct or alleviate this problem.
You use a wedge filter and put the thick part of the filter over the ankle joint
What 2 joints must be present on a lower leg radiograph?
Tibiotalar joint and the knee joint
For the mortise view/position ankle, an imaginary line through the malleoli will be –1– to the IR.
parallel
Where should the CR be directed for an AP projection ankle?
mid-malleoli
In a properly positioned lateral ankle where should the fibula be demonstrated in relation to the tibia?
superimposed and behind the tibia
When performing stress view ankles, what is the most important fact to remember about the specific position of the ankle?
The ankle must be dorsiflexed -*do not roll the ankle, it must remain AP
Weight bearing studies of the ankles show the possible presence of –1–.
joint space narrowing
What is the SID for an ankle exam?
40 SID
What is the SID for a lower leg exam?
48 SID
Why is the SID important for lower leg exams?
You increase the SID 8 inches to 48 inches so you can include the entire tib/fib and the ankle and knee joints on the radiograph. (mag)
What is the proper amount of flexion suggested for a lateral lower leg?
20-30 degrees
How many degrees should the leg be rotated when performing oblique images of the tibia/fibula?
45 degrees
Label the specific position of the ankle images below.
- AP ankle with 20 degrees of internal rotation. “Mortise ankle”
- AP Ankle
- AP medial oblique- 45 degree ankle
What knowledge did you use to determine the positions for the radiographs above?
- AP ankle with 20 degrees of internal rotation.
“Mortise ankle”- shows entire joint space of the ankle. - AP Ankle- shows slight superimposition of the distal tib/fib.
- AP medial oblique- 45 degree ankle-shows the distal tib/fib without superimposition.
Lower leg and ankle exams are a long scale of contrast.
False
It is acceptable positioning to only roll the foot itselft when performing oblique images of the ankle.
False (must roll entire leg)
Label the radiograph.
A. Tibia B. Fibula C. Tibiotalar joint D. Talus E. Navicular F. Cuboid G. Calcaneous
Name one method name that will demonstrate the intercondyloid fossa of the knee.
Holmblad, Camp Coventry, Berlere (sp?)
What is another name for the talus?
Astragulus (sp?)
What is the medial ridge of bone on the os calcis that supports the arch?
Susteutaculum Tali (sp?)
Name the medical term for “shin splints”. It is the incomplete separation of the tibial tuberosity.
Osgood Schlaughters
When performing an upright abdomen radiograph, the minimum degree that a patient be elevated to be considered upright is?
70 degrees.
