Knee Objectives
Terms
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- State how to locate the knee joint for centering.
- flex the joint slightly, locate the apex of the patella, and as the patient extends the knee, center their about ½ inch below the patellar apex.
- State the importance of having the tube angled for both the AP and lateral projections.
- It prevents the joint space from being obscured by the magnified image of the medial femoral condyle.
- List the criteria for evaluating an AP knee radiograph.
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-Open femorotibial joint space
-Slight superimposition of the fibular head if the tibia is normal. - State the correct amount of flexion of the knees when doing a lateral projection
- 20-30 degrees
- State the correct amount of flexion of the knees when doing a lateral projection for a new or unhealed patellar fracture.
- No more than 10 degrees
- State how you would find the knee joint for a lateral projection.
- Grasp the epicondyles and adjust the m so they are perpendicular to the IR.
- Describe how you can tell a true lateral knee on a radiograph.
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Femoral condyles superimposed
Open patellofemoral joint space - Explain why a standing AP projection of the knees would be of value.
- It reveals the narrowing of a joint space that appears normal on the non-weight bearing study.
- Describe the oblique projections of the knee that demonstrate the proximal tibiofibular articulation.
- AP and PA medial oblique
- Describe the two PA axial projections for the intercondylar fossa.
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Hombland method
-camp-coventry method. - Describe the AP axial projection to demonstrate the intercondylar fossa.
- Beclere method
- List the methods that demonstrate the intercondylar fossa.
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-Hombland
-Camp-Coventry
-Beclere - Describe the tangential projections that will place the patella in profile and open the patellofemoral articulation.
- Hughston method, Merchant method, Settegast method
- 16) Name the projection of the patella that should not be attempted until a transverse fracture has been ruled out with a lateral projection.
- Tangential projection (Sattegast method)