The Lasegue test, also known as the straight leg raise test, is a physical exam used to assess for sciatica or nerve root irritation in the lower back.
How is the Lasegue Test Performed?
- Positioning: The patient lies flat on their back with their legs extended.
- Leg Elevation: The examiner slowly raises one of the patient's legs straight up, keeping the knee straight.
- Pain Assessment: The examiner observes for pain, tightness, or discomfort in the patient's leg or lower back.
- Dorsiflexion: If pain is reported, the examiner may ask the patient to point their toes upwards (dorsiflexion). This movement can further exacerbate pain if nerve root irritation is present.
Interpretation of Results
- Positive Lasegue Test: Pain or discomfort in the leg or lower back upon leg elevation is considered a positive Lasegue test. This suggests potential nerve root compression or irritation.
- Negative Lasegue Test: No pain or discomfort during the test indicates a likely absence of nerve root irritation.
Additional Considerations
- The Lasegue test is often performed in conjunction with other physical exam maneuvers, such as the crossed Lasegue test, to further evaluate potential nerve root involvement.
- While the Lasegue test is a helpful tool, it is not a definitive diagnostic test. Further investigations, such as imaging studies, may be required to confirm the diagnosis.
