Which statement best describes the overall clinical utility of the straight leg raise test?

• A. It confirms disc herniation with high specificity.
• B. It is primarily used to assess knee ligament injury.
• C. It has high specificity for disc herniation.
• D. It helps detect disc herniation, and a negative result lowers likelihood due to high sensitivity.

Answer: (D)

The straight leg raise test is valued for its sensitivity in detecting nerve root irritation from lumbar disc herniation. Because it’s highly sensitive, a negative result makes disc herniation unlikely, helping to rule out the condition. However, its specificity is limited, so a positive result does not confirm a herniated disc—many other causes of leg pain can produce a positive result. It’s not a test for knee ligaments, so its main clinical utility is to flag potential disc-related radiculopathy, with a negative result significantly lowering the probability of disc herniation.