{"id":2964,"date":"2026-08-13T02:06:00","date_gmt":"2026-08-13T02:06:00","guid":{"rendered":"https:\/\/34-74-180-255.nip.io\/glossary\/what-is-a-straight-leg-test-for-cauda-equina\/"},"modified":"2026-10-13T17:46:40","modified_gmt":"2026-10-13T17:46:40","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":"What Is a Straight Leg Test for Cauda Equina?"},"content":{"rendered":"\n
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Cauda Equina Syndrome<\/p>

What Is a Straight Leg Test for Cauda Equina?<\/h1>

Understanding a key diagnostic tool for lower spine nerve compression and when it matters for your injury claim.<\/p>

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By CHG Lawyers \u00b7 Published October 04, 2026<\/p>\n\n

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Straight Leg Test for Cauda Equina Syndrome: What You Need to Know<\/h2>\n

A straight leg test for cauda equina syndrome<\/a> is a simple bedside exam doctors use to screen for nerve irritation. The examiner slowly raises your straightened leg to check for pain or nerve symptoms. It’s a useful screening tool, but it cannot 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, clear information matters. Below, we explain what this test is, what results mean, and how it fits into diagnosing cauda equina syndrome (CES)<\/a>. 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 Test?<\/h2>\n

A straight leg raise (SLR) test is a physical exam where you lie flat on your back. The examiner lifts one straight leg slowly to check for pain or nerve irritation. Doctors also call it Las\u00e8gue’s test.<\/p>\n

According to StatPearls<\/a>, the SLR test is a fundamental part of examining patients with lower back pain. It’s quick and requires no machines, scans, or lab work. That matters because it can be done anywhere\u2014in an emergency room, an urgent care clinic, or a doctor’s office.<\/p>\n

How the Straight Leg Raise Test Is Performed<\/h2>\n

The examiner asks you to lie on your back with legs relaxed. They slowly lift one straightened leg toward the ceiling. The doctor watches for the angle where pain or nerve symptoms begin.<\/p>\n

According to an NIH case study<\/a>, the leg is typically raised to about 70 degrees. 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 check and record findings for both legs.<\/p>\n

What a Positive Straight Leg Test Means<\/h2>\n

A positive straight leg raise usually means pain shoots down your leg when it’s lifted. This 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\u2014where raising the good leg causes pain in the bad leg\u2014can suggest a more serious disc problem.<\/p>\n

Here is the critical limit: a positive or negative SLR alone cannot confirm or rule out cauda equina syndrome. 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<\/a>. 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 relying on the SLR alone to assess CES can be misleading and dangerous.<\/p>\n

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