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Leg Length Discrepancy Test

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Other Names

  • Leg Length Discrepancy Test
  • Direct tape measurement method


Demonstration of the ASIS to medial malleolus technique[1]
  • Measure limb length to compare both legs


  • Measure from Pubic symphysis to medial malleolus
    • Apparent Method
  • Measure from ASIS to medial malleolus
    • True Method
    • Less accurate orientation due to crossing over patella
  • Measure ASIS to Lateral Malleolus
    • Most accurate orientation due to straight inferiorly
  • Xiphoid process over umbilicus down to malleolus
    • Least accurate due to crossing over multiple joint lines
  • Compare measurements bilaterally
  • Positive test
    • Clinically significant > 2cm shortening of affected side comparatively (true or pseudo LLD)

Block Method

  • Observe iliac crest & palpate symmetry
    • Insert a block or book under affected side
    • Continue until bilateral iliac crests are symmetrical in height
    • Positive test
      • Block or book elevation difference of affected limb to make iliac crests symmetrical
    • Relies on 3 objective findings to signify leg length discrepancy
      • Upper lateral thigh will protrude when standing
      • Scoliosis will be apparent
      • Examiner’s hands on patient’s iliac crests will rest at different heights



  • Unknown

See Also


Created by:
John Kiel on 5 August 2019 00:18:37
Last edited:
16 April 2023 19:03:36