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Thomas Test

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Other Names

Thomas Test
Clinical demonstration of a normal thomas test[1]
  • Iliacus Test
  • Iliopsoas Test
  • Modified Thomas Test


  • Measure the flexibility of the Hip Flexors
  • Named after Dr Hugh Owen Thomas[2]


  • Patient is supine
  • Version 1
    • The affected limb is flexed maximally to chest
    • Unaffected limb left in extension/ resting position
    • Important that lumbar lordosis is flattened out and pelvis is stabilized
  • Version 2
    • Maximal flexion of both knees towards chest
    • Lower affected limb toward the table laterally while maintaining the unaffected limb in maximal flexion
    • Measure the length of iliopsoas by the angle of hip flexion
  • Positive results
    • Unable to maintain their lower back or sacrum against the table on affected side
    • Hip has a large posterior tilt (>15°)
    • Knee unable to flex more than 80°

Modified Thomas Test

  • Similar to standard Thomas test
  • However, contralateral leg is allowed to hang down over the edge of the table



  • Needs to be updated

See Also


  1. Peeler, J., and Judy E. Anderson. "Reliability of the Thomas test for assessing range of motion about the hip." Physical Therapy
  2. Thomas HO. The classic. Diseases of the hip, knee and ankle joint with their deformities treated by a new and efficient method. Clin Orthop Relat Res. 1974 Jul-Aug;(102):4-9.
Created by:
John Kiel on 14 July 2019 22:59:43
Last edited:
23 August 2023 00:18:58