Plicae
Typically plicae are found in three positions -
- suprapatellar (SPP) (above the patella or kneecap)
- infrapatellar (IPP) (below the patella), sometimes called the 'ligamentum mucosum' or 'filmy ligament' as it mimics the cruciate ligament inside the knee, but is not a ligament at all.
- medial (MPP) (on the inner aspect of the knee). It may form a shelf-like band and is then referred to as a 'medial shelf'.
In the illustration above, looking at the knee bones of the right knee from its inner aspect, you can see the relationship of the media and suprapatellar plica. Here the leg is straight.
When the knee is bent, the plicae taughten, and a medial plica can snap abruptly over the medial femoral condyle, while the suprapatellar plica may be nipped between condyle and the quadriceps tendon.
The medial plica can also become nipped between patella and condyle, causing momentary pain and 'giving way'.
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