foot

Question 1

Guidelines for an AP axial projection

Answer 1

• Equal spacing between the 2 through 5th MTs
• The joint space from the medial and intermediate cuneiforms is seen
• 1/3 of the talus (2 cm) is superimposing the calcaneus
• TMT and navicular-cuneiform jt space open
• 3 MT base center
• need to have proximal calcaneus and neck of talus

Question 2

How is the medial arch formed?

Answer 2

between heel and the medial three MTP joints

Question 3

How does AP foot rotation occur?

Answer 3

Due to the lack of contact between the plantar arch surface and IR.

Question 4

What happens when the foot is laterally rotated?

Answer 4

MT bases show increased superimposition, medial and intermediate cuneiform joint is close and the talus moves over the calcaneus by more than a 1/3 (>2cm).

Question 5

What happens when the foot is medially rotated?

Answer 5

MT bases show decreased superimposition.
The medial and intermediate cundiform joint is closed
Less than a 1/3 of talus will superimpose the calcaneus.

Question 6

why does the height of the medial longitundinal arch vary between patients?

Answer 6

Due to the supporting ligaments and muscular structures.

Question 7

Why do we want the CR perpendicular to the dorsal surface of the foot?

Answer 7

This aligns the ray parallel to the TMT jts and open navicular-cuneiform joint spacesWrong alignment will lead to closed TMT and navicular cuneiform joint spaces.

Question 8

Exposures for foot

Answer 8

50-4