Double contour sign (knee)

The double contour sign is a helpful radiologic sign of trochlear dysplasia and is seen on true lateral knee radiographs as a double line at the anterior aspect of condyles that occurs if the medial femoral condyle is hypoplastic.

Knee pathology

The knee is a complex synovial joint that can be affected by a range of pathologies:

Article information

rID: 22118
Section: Signs
Synonyms or Alternate Spellings:
  • Double contour sign (trochlear dysplasia)
  • Double contour sign of trochlear dysplasia
  • The double contour sign of trochlear dysplasia
  • The double contour sign (trochlear dysplasia)

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Cases and figures

  • Patellar dislocation with chondral injury
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