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Related Experiment Videos

Prone knee-flexion provocative testing for lumbar disc protrusion.

L D Herron, H C Pheasant

    Spine
    |January 1, 1980
    PubMed
    Summary

    A new clinical test, the prone knee-flexion provocative test, helps distinguish neurologic back pain from axial pain. This test identifies nerve compression from intervertebral disc protrusion, suggesting mild to moderate disc conditions treatable with conservative therapy.

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    Area of Science:

    • Neurology
    • Orthopedics
    • Physical Therapy

    Background:

    • Differentiating neurologic from axial back and leg pain is crucial for accurate diagnosis and treatment.
    • Intervertebral disc protrusion can cause nerve compression, leading to neurologic symptoms.
    • Lumbar spinal extension can contribute to biomechanical factors causing nerve compression.

    Observation:

    • The prone knee-flexion provocative test is a novel clinical maneuver.
    • This test elicits or exacerbates reflex suppression and/or motor weakness.
    • These findings are indicative of nerve compression secondary to intervertebral disc protrusion.

    Findings:

    • The test's pathophysiology involves spinal nerve compression.
    • Compression results from a combination of biomechanical factors during lumbar spinal extension.

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  • The test is effective in demonstrating evidence of neural compression.

    • Implications:

    • The prone knee-flexion provocative test aids in diagnosing neurologic back pain.
    • Positive test results suggest mild to moderate disc pathology.
    • These conditions are likely responsive to conservative therapeutic interventions.