Kemp’s test is a hands-on physical exam used to help identify the source of back or neck pain. During the test, a clinician guides you through a combination of spinal extension, rotation, and side bending to stress specific structures in your spine. It’s most commonly used to evaluate facet joint pain (sometimes called facet syndrome) and can also help a clinician determine whether a disc problem is contributing to your symptoms. You may also hear it called the Quadrant test or the Extension-Rotation test.
What Happens During the Test
Kemp’s test is performed while you’re standing or seated, depending on the area being evaluated. For the lumbar spine (lower back), the examiner typically stands behind you, places one hand on your hip or pelvis for stabilization, and uses the other hand on your shoulder to guide your upper body into a specific movement pattern. You’ll be directed into extension (leaning backward), side bending toward the painful side, and rotation toward that same side, creating a three-dimensional backward movement. The position is held for about three seconds.
If your initial response doesn’t clearly reproduce your symptoms, the examiner may add gentle downward pressure through your shoulders while you’re in the fully extended and rotated position. This extra compression increases the load on the structures at the back of the spine. The test can also be performed on the cervical spine (neck) using the same general principle of combined extension and rotation, though the hand placement differs.
What the Test Is Checking
The backward-and-rotated position compresses the facet joints, which are the small paired joints that connect each vertebra to the one above and below it. These joints allow your spine to bend and twist, but they can become inflamed, arthritic, or irritated. When Kemp’s test reproduces a familiar, localized ache in your back or neck, it suggests the facet joints are a likely pain source.
The same movement also narrows the openings where spinal nerves exit the spine (the intervertebral foramina). If the test produces pain that radiates down into your leg or arm rather than staying local, that pattern points more toward nerve compression, potentially from a herniated or bulging disc. Clinicians pay close attention to both the location and the quality of the pain you report. A deep, achy pain that stays near the spine tells a different story than sharp or shooting pain that travels into a limb.
The direction of your symptoms matters too. By correlating the side of your pain, any visible lean in your posture (called an antalgic lean), and whether symptoms change when you’re moved toward or away from the painful side, the examiner can get a sense of whether a disc protrusion is pushing on a nerve from the inner (medial) or outer (lateral) side of the spinal canal.
How It Compares to the Straight Leg Raise
If you’ve had back pain evaluated before, you may have also experienced the straight leg raise (SLR), where you lie on your back and the examiner lifts one leg while keeping the knee straight. The two tests approach the spine from different angles. The straight leg raise stretches the sciatic nerve and its roots to detect nerve irritation, particularly from disc herniations in the lower lumbar spine. It’s primarily a nerve tension test.
Kemp’s test, by contrast, compresses rather than stretches. It loads the facet joints and narrows the nerve exit points through spinal positioning. This makes it more useful for evaluating facet joint problems specifically, while still providing information about disc-related nerve compression when radicular (radiating) symptoms appear. The two tests complement each other and are often used together during the same exam to build a more complete picture of what’s going on.
What a Positive Result Means
A test is considered positive when it reproduces your familiar pain, meaning the pain you recognize as your usual complaint, not just general discomfort from being bent into an awkward position. Some stiffness or mild discomfort during the maneuver is normal and doesn’t count as a positive finding. The clinician is looking for a clear reproduction of the specific symptoms that brought you in.
A positive Kemp’s test doesn’t give a definitive diagnosis on its own. It’s one piece of a larger clinical puzzle. The gold standard for confirming facet joint pain is a diagnostic nerve block, where a small injection temporarily numbs the nerve supplying a specific facet joint. If the block eliminates your pain, that confirms the facet joint as the source. Kemp’s test serves as a screening tool that helps clinicians decide whether that kind of follow-up is warranted.
How Reliable Is the Test
Kemp’s test is widely used in chiropractic, orthopedic, and physical therapy settings, but its diagnostic accuracy has some limitations. A systematic review in the Journal of the Canadian Chiropractic Association examined the available evidence comparing the test’s results against diagnostic nerve blocks and found that the research base is limited. Notably, the studies reviewed didn’t even use the name “Kemp’s” or “Quadrant” consistently, instead referring to the maneuver as the extension-rotation test, which reflects a broader challenge: there’s no universally standardized version of the procedure.
This variability means the test’s accuracy can depend on how it’s performed, how much compression is applied, and how the clinician interprets your response. It works best as one component of a thorough physical exam rather than as a standalone diagnostic tool. When combined with your symptom history, imaging results, and other orthopedic tests, it provides genuinely useful information about the likely source of your pain.
What to Expect if You’re Getting One
The test itself takes less than a minute per side. You won’t need to undress or prepare in any special way. The clinician will likely test both sides for comparison, even if your pain is only on one side. You may feel some discomfort during the maneuver, especially if your facet joints or nerves are irritated, but the position is only held briefly. Communicating clearly about what you feel, where you feel it, and whether it matches your usual pain is the most helpful thing you can do during the test.
If the test reproduces your symptoms, your clinician will use that information alongside the rest of your exam findings to guide the next steps, which might include imaging, additional testing, or a treatment plan targeting the structures most likely responsible for your pain.