Supine-to-Sit Test (Long Sitting Test) Special Test
Orthopedic Physical Examination & Clinical Assessment Guide
What is it used for?
- Differentiating Functional Leg Length Discrepancy caused by Sacroiliac Joint (SIJ) rotation.
How to Perform
- Step 1: Patient lies supine. Examiner compares malleoli levels.
- Step 2: Patient sits up (Long Sitting). Examiner compares malleoli levels again.
Interpretation of Results
- Positive Test: One leg appears longer in supine but shorter in sitting (or vice versa).
- Interpretation: This suggests an Anterior or Posterior Innominate Rotation (SIJ dysfunction) rather than a true short bone.
Clinical Context & Limitations
The Supine-to-Sit Test (Long Sitting Test) should be considered as one component of a comprehensive musculoskeletal assessment. No single special test has perfect diagnostic accuracy; thus, clinical decision-making should integrate test results with patient-reported symptoms, mechanism of injury, functional impairment, and relevant imaging.
Clinicians should be aware of potential false-positive results in patients with pain sensitisation, muscle guarding, or poor relaxation. For the Hip region, combining the Supine-to-Sit Test (Long Sitting Test) with complementary examination tests significantly improves overall diagnostic confidence.
References
- Magee, D. J. (2021). Orthopedic Physical Assessment.
