Prone Knee Flexion Test for Lumbar Spine

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

What is Prone Knee Flexion Test for Lumbar Spine?

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


How it's Performed?

  • Place the patient in prone position.
  • The examiner bends the patient’s knee and tries to bring the heel as far as possible toward the buttocks.
  • First the patient should passively give way, but then try to extend the leg against the resistance of the
    examiner’s hand.

What does a positive Prone Knee Flexion Test for Lumbar Spine mean?

  • Prone Knee Flexion Test for Lumbar Spine is considered positive when there is a feeling of tension first in the sacroiliac joint, then in the lumbosacral junction, and lastly in the lumbar spine.
  • This test should be performed when there is suspicion of changes in the pelvic ligaments and intervertebral disks.
  • Pain in the sacroiliac joint or in the lumbosacral or lumbar areas without radicular, radiating pain suggests degenerative changes and/or ligament insufficiency.
  • Increase in radicular pain indicates intervertebral disk injury.
  • Unilateral nerve root pain in the lumbar spine, in the buttock region, and over the posterior thigh suggest L2/L3 nerve root injury.
  • During this test the femoral nerve will also be stretched. The occurrence of pain and/or paresthesia in the anterior thigh indicates tight quadriceps, quadriceps lesion, or femoral nerve irritation.

Reference

  • Clinical Tests for the Musculoskeletal 3rd Ed. Book

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