Prone Knee Flexion Test

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 Prone Knee Flexion Test

What is Prone Knee Flexion Test for Lumbar Spine?

Prone Knee Flexion Test for Lumbar Spine is used to differentiates between lumbar spine pain and sacroiliac joint pain.

See Also: Lasegue Test

How do you do the Prone Knee Flexion Test?

Prone Knee Flexion Test
Prone Knee Flexion Test

What does a positive Prone Knee Flexion Test mean?

Prone Knee Flexion Test Accuracy

Cibulka and colleagues examined 219 patients with and without low back and sacroiliac joint mediated pain to examine the sensitivity, the specificity, and the positive and negative predictive values of four commonly used SIJ tests: the standing flexion test, PSIS palpation while seated, the long sitting test, and the prone knee flexion test. SIJ dysfunction was considered positive if at least three of the four tests were positive.

The combination of these tests yielded a sensitivity of 82 %, a specificity of 88 %, a positive predictive value of 86 %, and a negative addictive value of 84 %.

However, because the individual test results were not documented, no conclusion can be made about isolated validity.


  1. Clinical Tests for the Musculoskeletal System, Third Edition book.
  2. Cibulka MT, Koldehoff R: Clinical usefulness of a cluster of sacroiliac joint tests in patients with and without low back pain. J Orthop Sports Phys Ther 29:83–89; discussion 90–92, 1999.
  3. L D Herron, H C Pheasant: Prone knee-flexion provocative testing for lumbar disc protrusion. L D Herron et al. Spine (Phila Pa 1976). Jan-Feb 1980. PMID: 6444765

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