We need you! See something you could improve? Make an edit and help improve WikSM for everyone.

Fouchers Sign

From WikiSM
Jump to: navigation, search

Other Names

  • Foucher Sign
  • Foucher's Sign


The right popliteal fossa. Left with muscles relaxed; right with resisted knee flexion. During resisted knee flexion the cyst (Cys) becomes harder, the semimembranosus (Sm) more prominent, and the cleft between Cys and Sm deeper.[1]
  • To evaluate the popliteal fossa for the presence of a Bakers Cyst


  • Examine the popliteal fossa in full knee extension and in flexion[2]
  • Positive test
    • Cyst often will be firm in full knee extension, soft when the knee is flexed
    • Cyst compression between the medial head of the Gastrocnemius and Semimembranosus as they approximate each other and the joint capsule during knee extension
  • Useful to distinguish from other masses in the popliteal fossa
    • Palpation of the mass is unaffected by the knee position
    • Examples: popliteal artery aneurysms, ganglia, adventitial cysts, and tumors



  • Unknown

See Also


  1. Canoso, J. J., et al. "Foucher's sign of the Baker's cyst." Annals of the rheumatic diseases 46.3 (1987): 228-232.
  2. Canoso JJ, Goldsmith MR, Gerzof SG, Wohlgethan JR. Foucher’s sign of the Baker’s cyst. Ann Rheum Dis. 1987;46:228-232.
Created by:
John Kiel on 16 December 2020 23:03:05
Last edited:
5 April 2023 21:21:04