Knee cap issues: Strange terminology. The patella or knee cap is dome shaped on the underneath. The medial facet is one half of the domed underneath. I suspect they tried to clean up/smooth out some uneven cartilage due to wear and tear. Medial extrusion simply means that the tissue (usually meniscus) is protruding or bulging to one side, commonly when the meniscus is torn.
Answered 4/19/2013
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