{"id":8764,"date":"2026-07-25T02:50:37","date_gmt":"2026-07-25T02:50:37","guid":{"rendered":"https:\/\/chglawyers.com\/resources\/glossary\/what-is-a-straight-leg-test-for-cauda-equina\/"},"modified":"2026-08-08T01:02:09","modified_gmt":"2026-08-08T01:02:09","slug":"what-is-a-straight-leg-test-for-cauda-equina","status":"publish","type":"page","link":"https:\/\/chglawyers.com\/resources\/glossary\/what-is-a-straight-leg-test-for-cauda-equina\/","title":{"rendered":"Straight Leg Test for Cauda Equina: Plain Guide"},"content":{"rendered":"\n
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Catastrophic Back & Neck Injuries<\/p>

The Straight Leg Test and Cauda Equina, Explained in Plain Language<\/h1>

If you or a loved one has severe back or neck injury symptoms, here's what this common bedside exam can and cannot tell you about a serious spinal cord emergency.<\/p>

Request a Free Case Evaluation<\/a><\/div><\/div>\n<\/div><\/div>\n\n\n

By CHG Lawyers \u00b7 Published July 25, 2026<\/p>\n\n

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What Is a Straight Leg Test for Cauda Equina? A Plain-Language Guide<\/h2>\n

A straight leg test for cauda equina is a simple bedside exam where a doctor slowly raises your straightened leg to check for nerve pain. It’s a screening tool, not a final answer. It can point to nerve trouble, but it can’t confirm cauda equina syndrome by itself. Only an MRI scan can do that.<\/p>\n

If you or a loved one is facing a serious back injury, you want clear information. Below, we explain what this test is, what the results mean, and how it fits into diagnosing cauda equina syndrome (CES). This page is educational only. It is not medical or legal advice.<\/p>\n\n

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What is a straight leg raise (SLR) test?<\/h2>\n

A straight leg raise test is a physical exam where you lie flat and the examiner lifts one straight leg to check for pain or nerve irritation. Doctors also call it Las\u00e8gue’s test. It’s commonly used when someone has low back pain that shoots down the leg.<\/p>\n

The straight leg raise (SLR) test is a fundamental part of examining a patient with lower back pain, according to StatPearls<\/a>. It’s a quick bedside maneuver. It doesn’t involve a machine, a scan, or a lab. That’s an important point we’ll return to below.<\/p>\n

How the straight leg raise test is performed<\/h2>\n

The examiner asks you to lie on your back, then slowly lifts one relaxed, straightened leg toward the ceiling. The doctor watches for the angle where pain or nerve symptoms begin. Case-study literature describes raising the leg up to about 70 degrees, per this NIH case study<\/a>.<\/p>\n

Sometimes the doctor adds small movements to increase nerve tension. For example, they may flex your foot upward (dorsiflexion). They may also lift the healthy leg to see if that triggers pain in the injured leg. This is called a crossed straight leg raise. Clinicians usually check and write down findings for both legs.<\/p>\n

What does it mean if a straight leg test is positive?<\/h2>\n

A positive straight leg raise usually means pain shoots down your leg when it’s lifted. That suggests irritation or pressure on a lower spine nerve root. According to ScienceDirect<\/a>, the test helps assess nerve root compression in the lower lumbar nerves.<\/p>\n

But a positive result does not name a specific diagnosis. It only points to possible nerve-root involvement. A crossed positive result \u2014 where raising the good leg causes pain in the bad leg \u2014 can suggest a more serious disc problem.<\/p>\n

Here’s the key limit: a positive or negative SLR alone cannot confirm or rule out cauda equina syndrome. That’s why doctors should never rely on this one test to decide.<\/p>\n

How the straight leg test relates to cauda equina syndrome<\/h2>\n

The cauda equina is the bundle of nerves at the base of your spinal cord. These nerves control your legs, bladder, bowel, and sexual function. When something presses on them, it can cause cauda equina syndrome (CES). CES is a medical emergency.<\/p>\n

The SLR may be part of the exam. But CES is defined by red-flag symptoms, not by the SLR result. A person can have cauda equina syndrome even with a normal straight leg raise. That’s why leaning on the SLR alone to assess CES can be misleading and even dangerous.<\/p>\n

What are the warning signs of cauda equina syndrome?<\/h2>\n

The warning signs of cauda equina syndrome include severe low back pain, numbness in the “saddle” area, and loss of bladder or bowel control. These are emergency symptoms. Watch for these red flags:<\/p>\n