Crossed Over Lasegue (Well Leg Raise) Special Test

What is it used for?

• Diagnosing a Large Central Disc Herniation.

How to Perform

• Position: Patient lies supine.
• Action: Perform a Straight Leg Raise on the unaffected (pain-free) leg.

Interpretation of Results

• Positive Test: Pain shoots down the affected (bad) leg even though it is not moving.
• Why: Pulling the nerve roots on the good side drags the dural sac, which indirectly pulls on the nerve roots of the bad side. This is highly specific for a herniated disc.

Diagnostic Accuracy

• High Specificity (>88%)

References

• Clinical Tests for the Musculoskeletal System.