What is medial plica and how is it classified?

Updated: Jul 05, 2018
  • Author: Tracy Lee Bigelow, DO; Chief Editor: Thomas M DeBerardino, MD  more...
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Answer

Medial plica has a reported incidence of 18-60%. The incidence of medial plica in anatomic studies is similar to that in arthroscopic studies. The most commonly cited incidence range in the literature is approximately 20-25%. Nakayama investigated the incidence of medial plicae in 3889 knee joints in the Japanese population and classified the plicae into four types according to Sakakibara’s classification, as follows [20] :

  • Type A - Those with a cordlike elevation in the synovial wall
  • Type B - Those with a shelflike appearance but not covering the anterior surface of the medial femoral condyle
  • Type C - Those with a large shelflike appearance covering the anterior surface of the medial femoral condyle
  • Type D - Those with double insertions into the medial wall or having a central defect

The incidence of medial plicae was 79.9%; the incidence of Sakakibara types A, B, C, and D medial plicae was 35.2%, 22.4%, 12.3%, and 10%, respectively. [20]


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