Synovial plicae (knee)

Dr Henry Knipe and A.Prof Frank Gaillard et al.

Synovial plicae are folds of synovium, thought to represent embryologic remnants. They are common, present in ~90% of arthroscopies 3

They have been implicated in anterior knee pain and possibly in chondromalacia patellae although their role remains controversial 1,3

Some plicae have been described with multiple names in the literature representing the same structure 1,2:

They range in shape from a ridge or shelf to more discrete cord-like structure 3

  • PD/T2: typically seen as a band-like low signal structure traversing through the joint space (arthrography study or when joint effusion is present)
Lower limb anatomy
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Article information

rID: 9174
Section: Anatomy
Tags: knee, variant
Synonyms or Alternate Spellings:
  • Plicae of the knee
  • Plica of the knee
  • Synovial plica of the knee

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Cases and figures

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    Case 1: medial plica with patella cartilage defect
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    Case 2: medial plica
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    Case 3: superior patella plica
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    Case 4: septum completum with haemarthrosis
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    Medial plica
    Case 5: medial plica
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    Case 6: infrapatellar plica injury
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    Case 7: suprapatella plica syndrome
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