Ankle Positioning Flashcards
What are the structures seen for an AP ankle?
- True AP position of ankle
- Distal ends of tibia & fibula, and the proximal portion of the talus are seen
- Tibiotalar joint space is seen
- Talus slightly overlapping distal fibula
- Includes tib-fib articulation & proximal half of metatarsals
How is the patient positioned for an AP ankle?
- Patient is either supine or sitting on table
- Dorsiflexed foot
Where is the CR for an AP ankle?
Perpendicular through the ankle joint between malleoli
What are the structures seen for an AP oblique medial rotation (mortise) ankle?
- Three sides of mortise joint visualised
- Talofibular joint spaced in profile
- No overlap of the anterior tubercle of the tibia and the superolateral portion of the talus with the fibula
- Includes tib-fib articulation and proximal half of metatarsals
How is the patient positioned for an AP oblique medial rotation (mortise) ankle?
- Patient is either supine or sitting on table
- Dorsiflexed foot
- Internally rotate leg & foot 15-20 degrees
Where is the CR for an AP oblique medial rotation (mortise) ankle?
Perpendicular through ankle joint between malleoli
Where is the intermalleolar plane for an AP oblique medial rotation (mortise) ankle?
Parallel with IR
Whats another name for a mortise view?
AP oblique medial rotation
Whats another name for an AP oblique medial rotation?
Mortise view
What are the structures seen for a 45-degree medial oblique ankle?
- Distal tibia, fibula, and talus are seen
- Distal tibia and fibula overlapping some of the talus
- Tibiofibular articulation seen
- Includes tib-fib articulation and proximal half of metatarsals
How is the patient positioned for a 45-degree medial oblique ankle?
- Patient is either supine or sitting on table
- Dorsiflexed foot
- Rotate hip, knee, and ankle as a unit 45 degrees medially
Where is the CR for a 45-degree medial oblique ankle?
Perpendicular through ankle joint between malleoli
What are the structures seen for a 45-degree lateral oblique ankle?
- Demonstrates superior aspect of calcaneus, called the calcaneal sulcus
- Subtalar joint is seen
- Useful in locating fractures
- Include tib-fib articulation and proximal half of metatarsals
Whats another word for the superior aspect of the calcaneus?
Calcaneal sulcus
What is the calcaneal sulcus?
The superior aspect of the calcaneus
What ankle view is useful in locating fractures?
45-degree lateral oblique
What is the 45-degree lateral oblique useful for?
Locating fractures
How is the patient positioned for a 45-degree lateral oblique ankle?
- Patient is supine or sitting on table
- Dorsiflexed foot
- Rotate hip, knee, and ankle as a unit 45 degrees laterally
Where is the CR for a 45-degree lateral oblique ankle?
Perpendicular through ankle joint between malleoli
What are the structures seen for a mediolateral ankle?
- Tibiotalar joint well visulaized
- Fibula over the posterior half of the tibia
- 5th metatarsal should be seen to check for jones fracture
- Include tib-fib articulation
How is the patient positioned for a mediolateral ankle?
- Patient is rolled toward the affected side to place lateral surface of ankle in contact with IR
- Dorsiflexed foot
Where is the CR for a mediolateral ankle?
Perpendicular at medial malleolus