DPM Diagnostic Imaging Interpretation 2

Question 1

On a lateral foot radiograph, which landmark is used to measure the calcaneal inclination angle?

Accepted Answer

Inferior surface of the calcaneus and the floor

Answer

The calcaneal inclination angle is measured between the inferior surface of the calcaneus and the weightbearing surface (floor), normally 18–22°.

Question 2

A stress fracture of the second metatarsal shaft in a dancer would most characteristically appear on plain radiograph as:

Accepted Answer

Lytic lesion with periosteal reaction after 2–3 weeks

Answer

Stress fractures often show no findings on initial radiographs; periosteal reaction and endosteal callus typically appear 2–3 weeks after onset.

Question 3

Which MRI sequence is most sensitive for detecting bone marrow edema in acute osteomyelitis of the foot?

Accepted Answer

STIR (Short Tau Inversion Recovery)

Answer

STIR sequences suppress fat signal and are highly sensitive for detecting bone marrow edema, making them the sequence of choice for early osteomyelitis.

Question 4

On a dorsoplantar (DP) radiograph, the intermetatarsal angle (IMA) in moderate hallux valgus typically measures:

Accepted Answer

13–20°

Answer

Moderate hallux valgus is associated with an IMA of 13–20°; angles above 20° indicate severe deformity.

Question 5

A 'C-sign' on a lateral ankle radiograph is pathognomonic of which condition?

Accepted Answer

Talocalcaneal coalition

Answer

The C-sign, formed by the outline of the talar dome and sustentaculum tali on lateral view, is a classic radiographic sign of talocalcaneal coalition.

(DPM) Doctor of Podiatric Medicine Practice Test

(DPM) Doctor of Podiatric Medicine Practice Test

DPM Diagnostic Imaging Interpretation 2