Cliff sign (hip microinstability)

Last revised by Henry Knipe on 16 Jun 2022

The cliff sign in hip microinstability is a steep drop-off and loss of normal sphericity of the lateral femoral head.

Radiographic features

Plain radiograph
  • Shenton line distortion
  • subluxation of the femoral head
  • sclerosis of the femoral neck
  • <3 mm anterior lateral capsule
  • >5 mm anterior capsular recess
  • posterior-inferior post-contrast accumulation 4

See also

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