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The diagonal medial plica: an underestimated clinical entity.

Patellar plical syndrome is a commonly reported, yet controversial entity. Arguments exist as to which component of the patella plica is most commonly involved clinically. The authors describe a plical structure which is seldom identified as a source of pathology. This structure, however, can be a primary source of pain accompanying extensor mechanism dysfunction. The aforementioned structure has been identified via arthroscopic technique, cadaveric dissection, and by palpation during clinical examinations. Conservative and surgical management is discussed.J Orthop Sports Phys Ther 1988;9(9):305-309.