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Pisani Sign

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Pisani Sign
a Lateral meniscal cyst is visible in 45° of knee flexion in the right knee. b Disappearance of the cyst with full flexion. c The clear appearance of the lateral meniscal cyst with external rotation of the tibia (L lateral, M medial, Arrow lateral meniscal cyst)[1]
Modified Pisan's manuever. a A prominent cyst in external rotation (left knee). b Disappearance of the cyst with internal rotation of the leg (L lateral, M medial, P patella, Arrow lateral meniscal cyst)[1]
  • Pisani Maneuver
  • Pisani Technique
  • Pisani's Sign
  • Pisani Sign for Meniscal Cyst
  • Pisani Sign (Parameniscal Cyst)
  • Disappearing Knee Cyst Sign
  • Meniscal Cyst Disappearing Sign
  • Dynamic Meniscal Cyst Sign
  • Joint Line Cyst Disappearance Sign
  • Pisani Knee Cyst Sign

Purpose

  • To evaluate for the presence of a parameniscal cyst when a mass is present on the knee
  • First described by Pisani in 1947[2]

Description

Classic Maneuver

  • Patient is supine
  • The mass is visualized with the knee in full extension
  • Mass disappears when the knee is placed in flexion

Modified Maneuver

  • Note: Proposed for lateral meniscus
  • The patient is supine
  • The knee is held at 45 degrees of flexion
  • Internally and externally rotate the leg
  • Positive test
    • Prominent cyst in external rotation disappears with internal rotation

Pathology

Evidence

  • Unknown

See Also

References

  1. ↑ 1.0 1.1 Pinar, Halit, et al. "A contribution to Pisani’s sign for diagnosing lateral meniscal cysts: a technical report." Knee Surgery, Sports Traumatology, Arthroscopy 17 (2009): 402-404.
  2. ↑ Pisani AJ. Pathognomonic sign for cyst of the knee cartilage. Arch Surg. 1947;54(2):188–190. doi: 10.1001/archsurg.1947.01230070193007
Created by:
John Kiel on 12 December 2024 14:44:31
Authors:
Last edited:
5 May 2026 00:25:58
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