Prone Knee Bending Test

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 Prone Knee Bending Test

What is Prone Knee Bending Test?

Prone Knee Bending Test (also known as reversed lasegue test) is used to evaluate the nerve roots of the upper lumbar spine (L2 to L4) especially the femoral nerve.

See Also: Lasegue Test

How do you do the Prone Knee Bending Test?

Prone knee bending test (reversed lasegue test) can also be carried out with the patient in the lateral position. The patient lies on the unaffected side with the affected extremity slightly flexed at the hip and knee. The examiner fixes the pelvis with one hand and grasps the patient’s knee with the other and move the hip into a hyperextended position while increasingly flexing the knee.

The zone at which the dura is stretched is 80–100 degrees of knee flexion. Knee flexion greater than 100% introduces both a rectus femoris stretch and lumbar spine motion into the findings. A number of sensitizing maneuvers can be used including hip extension, plantar flexion, dorsiflexion, or head movements.

What does a positive Prone Knee Bending Test mean?

Prone Knee Bending Test Accuracy

The reliability and validity of the Prone Knee Bending Test is not known.

Porchet and colleagues 1 found the test to have:

Crossed Prone Knee Bending Test

This is a variation of the Prone Knee Bending Test except that the uninvolved lower extremity is moved into knee flexion.

A positive test is the reproduction of the patient’s symptoms in the untested (opposite) leg.

No diagnostic accuracy studies have been performed to determine the sensitivity and specificity of this test.


See Also: Ober test
femoral nerve anatomy
Femoral Nerve Anatomy


  1. Davis DS, Anderson IB, Carson MG, Elkins CL, Stuckey LB. Upper Limb Neural Tension and Seated Slump Tests: The False Positive Rate among Healthy Young Adults without Cervical or Lumbar Symptoms. J Man Manip Ther. 2008;16(3):136-41. doi: 10.1179/jmt.2008.16.3.136. PMID: 19119402; PMCID: PMC2582423.
  2. Deyo RA, Rainville J, Kent DL: What can the history and physical examination tell us about low back pain? JAMA 268:760–765, 1992. PMID: 1386391
  3. Clinical Tests for the Musculoskeletal System, Third Edition book.
  4. Mark Dutton, Pt . Dutton’s Orthopaedic Examination, Evaluation, And Intervention, 3rd Edition Book.

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