Week 11 - Patella and Knee Imaging Techniques

These flashcards cover key concepts and techniques in imaging the patella and knee, including positioning, central ray orientation, and structures to include.

What is the central ray (CR) orientation for the PA Patella view?

Perpendicular to the mid-patella.

Which structures are included in the PA Patella exam?

Patella and adjacent structures.

What is a key positioning tip for the PA Patella view?

Place support under the lower leg/ankle and a small support above the knee.

What is the relationship of the intercondylar line to the IR in a PA Patella view?

It should be parallel to the IR with a 5-10° lateral rotation of the heel.

In the Lateral Patella view, what is the CR orientation?

Perpendicular, with no angle required.

What joint space is highlighted in the Lateral Patella view?

Patellofemoral joint space.

What structures are included in the Lateral Patella exam?

Patella, patellofemoral joint space, and anterior soft tissue.

What type of positioning is required for the Lateral Patella view?

Position the patient in a lateral knee position.

Describe the CR orientation for the Patella Tangential view.

Parallel to the anterior patellofemoral surface.

What is critical about the positioning of the IR in the Patella Tangential view?

Align the IR with the tube to reduce distortion.

What is the central ray (CR) for the Intercondyloid Fossa view?

Perpendicular to the lower leg (tib/fib).

Where does the CR enter for the Intercondyloid Fossa view?

1 cm below the patellar apex.

What angle should the femur be to the table in the Intercondyloid Fossa view?

60 degrees.

What structures are evaluated in the Intercondyloid Fossa view?

Intercondyloid fossa, distal femoral condyles, and proximal tib/fib.

What should be done to ensure good collimation in the PA Patella view?

Ensure that the soft tissue border is clear.

Why is alignment of the hip to the ankle important in knee imaging?

To reduce rotation and ensure accurate imaging.

What term is used to describe the Intercondyloid Fossa view?

Tunnel view or notch view.

What is the relevance of the tibial tuberosity position in the knee imaging?

It should be posterior to the intercondylar sulcus for good knee flexion.

What is the flexion angle recommended for the knee in the Patella Tangential view?

Knee flexed at approximately 40° to 60°.

What should be placed behind the patient in the Patella Tangential view for support?

A sponge behind the patient's back.

Where should the side marker be placed in the Patella Tangential view?

On the lateral side of the knee.

What is an important reminder regarding the image receptor (IR) positioning?

Offset the IR to align with the central ray (CR).

What should be done to flex the patient's leg when preparing for the Intercondyloid Fossa view?

Flex the patient’s leg to 60°.

How is the IR positioned in relation to the rectangular sponge in the Intercondyloid Fossa view?

The IR is placed on top of the rectangular sponge.

For the PA Patella view, what should be published to indicate the orientation?

Pronate the marker.

What does good knee flexion indicate during imaging?

It helps to demonstrate proper positioning for structural assessment.

What helps in reducing distortion when imaging the patella tangentially?

Aligning the IR properly with the central ray.

What is the function of using sponges during knee positioning?

To support the patient and maintain the required angles.

Why is the tunnel view called so in knee imaging?

Because it allows visualization of the intercondyloid fossa.