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Questions and Answers
In the AP position of the knee joint, the leg should be posed in external rotation of around 5 degrees.
False
The central ray for the knee joint x-ray should be projected perpendicularly toward 2 cm below the tip of patella.
False
In the lateral knee joint position, the opposite leg of filming knee should be placed at 30-35 degrees.
False
The patella should not be shown overlap above the femur shadow in the AP position.
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The IR size for the knee joint x-ray is 9*11 inches.
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The knee joint should be shown in stack in the AP position.
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In the Skyline view, the patient can be placed in lateral decubitus position.
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The patellofemoral joint cavity should not show clearly without overlapping in the Skyline view.
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Study Notes
Knee Joint Positions
- AP Position:
- Patient can be in supine or sitting position
- Leg is positioned with internal rotation of around 5 degrees
- Axis of leg and knee should match vertical axis of image receptor (IR)
- Region:
- Knee joint, proximal tibia, proximal fibula, and distal femur are included
- Pathology:
- Ligament injury, fracture, chondromalacia, degenerative joint disease, and arthritis of knee joint can be detected
AP Position (continued)
- IR size: 8*10 inch
- SID: 100 cm
- Central ray: projects perpendicularly toward 1 cm below the tip of patella
- Respiration: unrelated
- Collimation: includes distal portion of femur, tibia, and proximal portion of fibula
- Evaluation:
- Knee joint should not be shown in a stacked position
- Medial portion of head of fibula should overlap tibia
- Patella should overlap above femur shadow
Lateral Knee Joint Position
- Patient is placed in lateral decubitus position
- Opposite leg is placed 15-20 degrees away from filming knee
- Bilateral condyles of femur are perpendicular to IR
- Evaluation:
- Patella should appear in true lateral position
- Patellofemoral joint should be open without overlapping
- Collimation: includes distal portion of femur, tibia, and proximal portion of fibula
Skyline View (Patella)
- Patient can be in prone or sitting position
- Image receptor (IR) is placed underneath the knee with 90-degree flexion
- Evaluation:
- Patellofemoral joint cavity should be clearly visible without overlapping
- Patella should be shown in half-side image
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Description
This quiz covers the positions and techniques used in radiography of the knee joint, including the AP position and the regions and pathologies that can be detected.
