Seated Flexion Test

Published July 2, 2026 Read time 1 min read Readers 3
Seated Flexion Test

What is the "Seated Flexion Test" used for?

  • Dysfunction of the sacroiliac joint 

How to perform the "Seated Flexion Test"?

  • The patient sits on a firm examination table, Legs hang over the edge with the feet supported, the examiner stands behind the patient.
  • Each posterior superior iliac spine (PSIS) is palpated with the thumbs placed inferiorly (caudally).
  • This position reduces innominate motion and is believed to isolate SI joint movement.
  • Examiner palpates both PSIS landmarks simultaneously.
  • The patient bends forward at the waist.
  • The examiner observes and compares PSIS motion.

What is the positive result?

Normal Finding

  • Both PSIS move superiorly and symmetrically as the patient flexes forward.

Positive Test

  • One PSIS moves more superiorly than the other.
  • The side that moves first or furthest is considered the restricted side.
  • This asymmetry suggests possible SI joint dysfunction or pelvic fixation.

Test Accuracy

  • Sensitivity: 9%
  • Specificity: 93%