FADIR Test for Hip Impingement and Labral Tears

The FADIR test is a hands-on clinical maneuver used to screen for problems inside the hip joint, especially femoroacetabular impingement (FAI) and labral tears. The name is an acronym for the three movements involved: Flexion, Adduction, and Internal Rotation. It is one of the most commonly performed hip tests in orthopedic and sports medicine clinics, valued because it is quick, requires no equipment, and is sensitive enough to catch many hip problems early. But the test has a well-documented weakness: it flags a lot of hips that turn out to be fine, and its accuracy numbers vary wildly depending on the study and the population being tested.

How the Test Is Performed

You lie on your back on an exam table. The examiner lifts one leg, bending the hip and knee to about 90 degrees. From there, they move the leg across your body (adduction) while simultaneously rotating the lower leg outward, which turns the thighbone inward at the hip socket (internal rotation). The whole thing takes a few seconds per side. The test is considered positive if it reproduces your familiar hip or groin pain during the maneuver.

What makes this combination of movements useful is that it drives the front of the femoral head (the ball at the top of your thighbone) into the front-upper rim of the acetabulum (the socket). If there is extra bone, a torn labrum, or inflamed tissue in that area, the compression provokes pain. A cadaveric study measuring pressures inside the hip capsule found that the FADIR position generates significantly higher intracapsular pressure in the lateral compartment compared to the opposite test position (flexion-abduction-external rotation, or FABER), confirming that the maneuver genuinely loads the structures clinicians are trying to test.¹ That same study cautioned clinicians to interpret pain during the FADIR test carefully, since the high pressures alone could provoke discomfort even in a structurally normal hip.

What the Test Is Meant to Detect

The FADIR test is most closely associated with femoroacetabular impingement syndrome, a condition where abnormal bone shape on the femoral head (cam morphology), the acetabular rim (pincer morphology), or both causes the bones to collide during certain hip movements. This repeated contact can damage the labrum, a ring of cartilage lining the rim of the socket that helps seal and stabilize the joint. Over time, untreated impingement can also wear down the articular cartilage inside the joint.

Because the FADIR maneuver compresses the anterior-superior part of the joint, it is also used as a general screen for labral tears regardless of whether impingement is the underlying cause. Clinicians frequently include it as part of a broader hip examination alongside tests like the FABER (Patrick’s test), the scour test, and internal rotation range-of-motion checks.² The consensus in the literature is that no single provocative test is sufficient on its own; a combination of tests along with imaging gives the most reliable picture.

Sensitivity, Specificity, and Why the Numbers Are All Over the Map

If you look up the FADIR test’s diagnostic accuracy, you will find numbers that seem to contradict each other from study to study. That is not a mistake or a sign of bad research. It reflects the reality that accuracy depends heavily on who is being tested and what imaging is used as the reference standard.

In one study combining impingement and range-of-motion tests, the FADIR test showed a sensitivity of about 80% but a specificity of only 25%.³ That means it caught four out of five people who actually had the condition, but three-quarters of the people without it also tested positive. A systematic review of physical examination tests for diagnosing FAI found that sensitivity across studies ranged from as low as 0.11 all the way up to 1.00, with the FADIR test generally landing at the higher end of that range.⁴

A separate systematic review looking specifically at prearthritic hip pathology found the FADIR test had the highest specificity at 47% when compared against certain reference standards, while a different test (IROP, or Internal Rotation Over Pressure) had the highest sensitivity at 91%.⁵ Another systematic review concluded that the overall utility of the FADIR test for diagnosing FAI “remains unclear given its moderate sensitivity and specificity” but noted it could serve as a useful screening tool because the test carries essentially no risk.⁶

A particularly striking finding from that last review: when imaging confirmation was done by x-ray, specificity dropped to just 11%, but when MRI was the reference standard, specificity reached 100%. That gap illustrates how much the “gold standard” matters. X-rays can miss soft tissue damage and subtle bone changes that MRI picks up, so the test’s accuracy looks different depending on what you compare it against.

The False-Positive Problem

The FADIR test’s biggest practical limitation is that it produces a lot of false positives, especially in certain populations. A study of youth ice hockey players without diagnosed hip disorders found the test had a sensitivity of only 41% and a specificity of 47% for detecting cam, pincer, or combined morphology on MRI. The researchers concluded the FADIR test was “inadequate for screening” in that population because of the sheer number of false positive outcomes.⁷ Even for cam-type morphology specifically, the sensitivity only climbed to about 60% with specificity staying around 52%.

Why so many false positives? The FADIR position stresses multiple structures at once. A tight hip capsule, mild muscle strain, hip flexor tendinopathy, or even normal anatomic variation can all produce discomfort during the maneuver without any bony impingement or labral tear being present. Young athletes, who often have tight hips from their sport, are particularly prone to testing positive without having an actual structural problem. This is why clinicians treat a positive FADIR as a reason to investigate further with imaging, not as a diagnosis in itself.

When the Pain Is Not Coming from the Joint at All

One underappreciated complication is that conditions completely unrelated to the hip joint can trigger a positive FADIR test. A study examining patients with groin pain of neurological origin, including nerve entrapment and lumbar radiculopathy, found that half of those patients also had a positive FADIR test.⁸ That is a significant finding because it means a clinician relying heavily on the FADIR result could send a patient down the wrong diagnostic path, pursuing hip joint imaging and potentially even hip surgery when the actual pain generator is a compressed nerve in the spine or pelvis.

This overlap makes the clinical context surrounding the test crucial. Where exactly the pain is felt during the maneuver, whether it matches the patient’s usual complaint, whether neurological signs like numbness or radiating pain are present, and what the rest of the examination reveals all factor into how a positive FADIR should be interpreted. The test gives a clinician a starting clue, not an answer.

How Reliable Is the Test Between Different Examiners?

Even before worrying about accuracy, there is a more basic question: do two different clinicians performing the test on the same person get the same result? Reliability research has found that this is a weak spot. One study measuring both intrarater reliability (the same examiner testing the same person twice) and interrater reliability (two different examiners testing the same person) reported intrarater reliability for the FADIR test at 0.75 and interrater reliability at just 0.40.⁹

A score of 0.75 for the same examiner is considered acceptable in clinical testing, but 0.40 between different examiners is poor. What this means in practice is that whether your FADIR test is positive could depend partly on who is performing it. The angle of hip flexion, how far the leg is adducted, the speed of the movement, and the amount of overpressure applied all vary from clinician to clinician. Because the test relies on whether pain is provoked, and because pain perception is subjective, subtle differences in technique can flip the result. Standardizing the technique, for example by using a smartphone goniometer to match joint angles, has been proposed to improve consistency, but this is not yet common in everyday clinical practice.

Using FADIR Results to Decide on Surgery

For patients who do have confirmed FAI syndrome and are considering hip arthroscopy, the FADIR test serves a different role: tracking whether surgery helped. A five-year follow-up study of patients who underwent hip arthroscopic surgery found that 36% still had a positive FADIR test at the five-year mark, which was a significant improvement compared to the rate before surgery.¹⁰ However, patients who still tested positive at five years reported significantly worse outcomes on hip-related quality-of-life scores compared to those whose FADIR had normalized.

That finding suggests the FADIR test has some value as a crude outcome marker after surgery. A persistently positive test years later may indicate residual impingement, incomplete labral healing, or the development of early joint degeneration. It is not definitive on its own, but when a post-surgical patient reports ongoing groin pain and the FADIR is still positive, it raises the question of whether additional imaging or intervention is needed.

Combining Tests for Better Accuracy

Because the FADIR test on its own has lopsided accuracy, catching many true cases but also flagging many false ones, the current clinical approach is to combine it with other tests. Research has shown that pairing impingement tests with range-of-motion assessments can improve overall diagnostic accuracy for FAI syndrome.¹¹ The logic is straightforward: the FADIR test is good at catching cases (high sensitivity), while other tests can help rule out false alarms (higher specificity). A reduced internal rotation range of motion, measured with the patient lying flat, is one of the most commonly paired findings with a positive FADIR.¹²

In practice, a typical clinical pathway might look like this: a patient comes in with groin or anterior hip pain. The clinician runs the FADIR test, the FABER test, checks internal rotation range of motion, and performs a scour test. If the FADIR and one or more additional tests are positive, and internal rotation is limited compared to the other side, there is stronger reason to order an MRI or MR arthrogram. If only the FADIR is positive and everything else looks normal, the clinician might monitor symptoms or explore non-articular causes before jumping to advanced imaging.

FADIR for Labral Tears Specifically

While the FADIR test is most commonly discussed in the context of FAI, it is also used to screen for labral tears as a standalone pathology. Here the evidence is mixed but revealing. One study evaluating clinical tests for labral tears found the FADIR test had a sensitivity of 43% and specificity of 56%, which are both mediocre.¹³ The positive predictive value, however, was 93%, meaning that when the test was positive in a population where labral tears were common, the patient almost always had one. The flip side was a negative predictive value of only 6%, meaning a negative test was nearly useless for ruling tears out.

Those numbers reflect the population studied. When you test people who are already in a sports medicine clinic with hip pain, the base rate of labral tears is high, which inflates positive predictive value. In a general or asymptomatic population, the same test would produce very different predictive numbers even with identical sensitivity and specificity. This is a common statistical reality in diagnostic testing that makes headlines about any single test’s “accuracy” somewhat misleading without knowing who was tested.

What Actually Happens Inside the Joint During the Maneuver

The cadaveric pressure data mentioned earlier deserves a closer look because it explains both why the test works and why it over-triggers. The FADIR position generated an average intracapsular pressure of about 27 mmHg in the lateral compartment, with a wide spread between specimens.¹⁴ The FABER position, by contrast, actually produced slightly negative pressure in the same compartment, meaning it decompresses that part of the joint rather than loading it. This mechanical difference is why the two tests are often used as a pair: the FADIR stresses the anterior-superior labrum and joint margin, while the FABER stresses the posterior and sacroiliac structures.

The wide variability in pressure measurements across specimens also helps explain why some people with perfectly normal hips report discomfort during the test. If your hip capsule happens to be stiffer than average, or if the examiner pushes a bit harder, the pressure spike may be enough to provoke pain even without any structural pathology. This is part of why the test’s interrater reliability is low and why experienced clinicians weigh the quality and location of the pain, not just its presence, when interpreting the result.

Who Should Get This Test and Who Should Be Skeptical of the Results

The FADIR test makes the most sense for people who have activity-related groin or anterior hip pain, especially pain that worsens with prolonged sitting, deep squatting, or pivoting movements. In that clinical context, a positive FADIR combined with limited internal rotation and at least one other positive provocative test gives a clinician reasonable grounds to pursue imaging. For athletes in sports that involve repetitive hip flexion and rotation, like hockey, soccer, martial arts, and dance, the test is a standard part of the hip exam.

Where skepticism is warranted is when the FADIR test is used as a standalone screening tool in populations without symptoms. The youth hockey study demonstrated this clearly: in young athletes with no hip complaints, the test produced more misleading results than useful ones.¹⁵ Screening asymptomatic people for structural hip changes with the FADIR test is not supported by the current evidence, and acting on a positive result in someone without pain risks unnecessary anxiety and imaging.

Equally, a negative FADIR test in someone with significant hip symptoms should not be reassuring. Given the test’s variable sensitivity and its low negative predictive value for labral tears, a negative result does not meaningfully reduce the probability that something is wrong. If the clinical story points toward hip pathology and the FADIR is negative, most clinicians will still pursue imaging based on the overall picture.