For Patellar tracking studies (beach ball test) the patient is positioned prone with their ankles over the inflated beach ball. An oil capsule is placed on the back of the affected knee. When ready the stopper is removed from the beach ball and the patient asked to deflate it by pressing down onto the table. Ensure the patient does not lift their knees off the table during the deflation and that they use a constant pressure.
- Routine knee sequences
- Re-position patient prone (as described previously).
- Axial localiser.
- Sag Localiser over both knees.
- GRE dynamic sequence over two minutes (Dynamic TFL)...temporal resolution of around 7 secs. Need at least 1 sagittal and 3 axial through the patella at each time point. As the leg is extended against the deflating beach ball the patella moves superiorly so on set up most distal slice should be at or around the mid patella. Include both knees with sagittal on symptomatic side. If both symptomatic please state which side the sagittal has been acquired from. Place oil capsule on symptomatic side.
"Patellar tracking MRI Protocol (beach ball test)"
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