Exam 6: Lower Limb

A patient enters radiology with a possible ligament tear to the lateral aspect of the ankle.Initial ankle radiographs are negative for fracture or dislocation.Because the clinic is in a rural setting, the patient cannot have an MRI performed to evaluate the ligaments of the ankle.Which of the following techniques may provide an assessment of the soft tissue structures of the ankle?

To ensure that both joints are included on an AP projection of the tibia and fibula on an adult, the technologist can:

The correct CR placement for an AP projection of the knee is midpatella.

Which of these labeled structures or bones identifies the navicular?

What are the two arches of the foot?

What is the major disadvantage of using 45° of flexion for the mediolateral projection of the knee?

How many articular facets make up the subtalar joint?

What CR angulation is recommended for an AP projection of the knee on a patient with an ASIS-to-tabletop measurement of 18 cm?

Where would the interphalangeal joint be found in the foot?

A radiograph of an AP projection of the second toe reveals that the interphalangeal joints are not open.What is the most likely cause for this radiographic outcome?

The AP mortise projection of the ankle is commonly taken in surgery during open reductions.

Which of the following knee projections requires the use of a special IR holding device?

For the AP weight-bearing knee projection on an average patient, the CR should be:

Which of these labeled structures or bones identifies the talus?

A radiographic appearance of a well-circumscribed lucency within bones describes:

Which special position of the knee requires that the patient be placed supine with 40° flexion of the knee and the CR angled 30° from the long axis of the femur?

Where is the CR placed for a mediolateral projection of the calcaneus?

A correctly positioned lateral ankle will demonstrate the lateral malleolus superimposed over the posterior half of the tibia.

The disadvantage of the superoinferior sitting, tangential (Hobbs modification) method is that it requires acute flexion of the knee.

How much knee flexion is required for the weight-bearing PA axial projection (Rosenberg method) of the knee?