The Sacroiliac Compression Test is a side-lying pain provocation test used to assess whether compression through the pelvis reproduces familiar sacroiliac-region symptoms. A positive test may increase suspicion that the sacroiliac region is relevant when the symptom is familiar and other SIJ provocation tests are also positive. However, the test does not confirm SIJ pain on its own. It is best interpreted as part of a cluster and recorded with detail in Measurz.

Introduction

The Sacroiliac Compression Test is commonly used in lumbar-pelvic assessment when a client reports posterior pelvic, buttock or sacroiliac-region symptoms. The test applies a compressive force through the pelvis while the client lies on their side. This loads the sacroiliac region and related posterior pelvic structures.

A useful result depends on whether the test reproduces the client’s familiar symptoms, not simply whether pressure feels uncomfortable. Because low back, pelvic and hip symptoms often overlap, the Sacroiliac Compression Test should be interpreted alongside history, pain behaviour, lumbar testing, hip assessment and other SIJ provocation tests.

Quick Summary

Test name: Sacroiliac Compression Test
Also known as: SIJ Compression Test, Approximation Test
Body region: Sacroiliac joint region and pelvis
Purpose: Assess symptom response to pelvic compression
Commonly associated with: SIJ-region pain provocation assessment
Positive finding: Reproduction of familiar posterior pelvic, buttock or SIJ-region symptoms
Negative finding: No familiar symptom reproduction
Best used with: Sacral Thrust, SIJ Distraction, Thigh Thrust, Gaenslen Test, FABER, lumbar screen and hip assessment
Key limitation: A single positive test does not confirm SIJ pain.

What Is the Sacroiliac Compression Test?

The Sacroiliac Compression Test is a passive provocation test performed in side lying. The professional applies downward or medial pressure through the upper iliac crest, compressing the pelvis and loading the sacroiliac region.

A positive finding occurs when this pressure reproduces the client’s familiar posterior pelvic, buttock or SIJ-region pain. The test should not be considered positive simply because the client feels pressure or general discomfort.

Why It Is Used

The test is used to explore whether pelvic compression reproduces familiar symptoms. It can support assessment reasoning when a client reports posterior pelvic pain, buttock-region symptoms or low back pain that may be influenced by pelvic loading.

The Sacroiliac Compression Test is particularly useful as part of an SIJ provocation cluster. When multiple provocation tests reproduce familiar symptoms, suspicion of SIJ-region involvement may increase. When several tests are negative, suspicion may decrease, depending on the client’s presentation and the quality of testing.

What It Assesses

The Sacroiliac Compression Test assesses:

• Symptom response to pelvic compression
• Familiar posterior pelvic or SIJ-region pain reproduction
• Tolerance to side-lying pelvic loading
• Consistency of symptoms across SIJ provocation tests
• Whether compression loading appears relevant to the presentation
• Side-to-side response when modified or repeated carefully

It does not assess pelvic alignment, leg length, joint position or sacroiliac “movement” with certainty.

Who It Is Useful For

This test may be useful for clients with posterior pelvic pain, buttock symptoms, low back pain with possible pelvic contribution, or symptoms aggravated by rolling, side lying, walking, stairs or load transfer tasks.

It is most appropriate when the client can tolerate side lying and controlled pressure through the pelvis. It may need to be modified or avoided when side lying is painful, symptoms are highly irritable, or there are safety concerns.

When to Use This Test

Use the Sacroiliac Compression Test when:

• The client reports posterior pelvic, buttock or SIJ-region symptoms
• You want to assess symptom response to pelvic compression
• Side lying is safe and tolerated
• The test will be interpreted with other findings
• You can clearly record whether symptoms are familiar
• You are using an SIJ provocation cluster

When Not to Use or When to Be Cautious

Use caution or avoid the test when there is recent trauma, suspected fracture, severe osteoporosis risk, inflammatory flare, severe pain irritability, pregnancy-related pelvic pain requiring positioning modification, recent surgery, inability to lie on the side, unexplained systemic symptoms or worsening neurological signs.

Stop the test if symptoms increase sharply, pain spreads significantly, neurological symptoms worsen, the client cannot tolerate side lying or the test cannot be performed safely.

Equipment Required

The Sacroiliac Compression Test requires:

• Firm treatment table
• Optional pillow between knees
• Optional head support
• Pain rating scale
• Symptom-location recording method
• Measurz app for structured documentation
• Optional video for technique review

Within Measurz, this test can be recorded with other SIJ provocation tests, lumbar ROM, hip ROM and functional assessments. MAT and Measurz workflows help professionals capture the details that matter: side tested, position, force direction, symptom reproduction, pain score and interpretation confidence.

Step-by-Step Protocol / Practice

Setup

Explain the test and clarify baseline symptoms. Ask the client to identify their current pain intensity and location before testing begins.

Client position

The client lies on their side, typically with the symptomatic side facing up. Hips may be flexed slightly for comfort, and knees may be bent. A pillow can be placed between the knees if needed, but any modification should be recorded.

Examiner/professional position

Stand behind the client, facing the pelvis. Position yourself so pressure can be applied smoothly through the upper iliac crest.

Hand placement

Place both hands over the upper iliac crest of the top side of the pelvis. Avoid pressing through the ribs or soft tissue only.

Stabilisation

Keep the client relaxed and aligned in side lying. Avoid excessive trunk rotation, hip rolling or shoulder movement.

Movement or force direction

Apply a slow, controlled downward or medial compressive force through the iliac crest toward the table. The pressure should be firm enough to load the pelvis but not sudden or excessive.

Instructions

Ask:

“Tell me if this reproduces your familiar pain.”
“Where do you feel the symptom?”
“Is this the same pain you usually experience?”
“Does the pain stay local or spread?”

Positive finding

A positive finding is reproduction of familiar posterior pelvic, buttock or SIJ-region symptoms during compression.

Negative finding

A negative finding is no reproduction of familiar symptoms.

Stopping criteria

Stop if symptoms increase sharply, pain spreads, neurological symptoms worsen, the client guards strongly, side lying is not tolerated or the response is unclear and further pressure is not appropriate.

Safety notes

Do not bounce or thrust suddenly. Do not interpret general pressure discomfort as a positive test. Record the symptom location and whether the pain was familiar.

Positive and Negative Test Interpretation

A positive Sacroiliac Compression Test may increase suspicion that pelvic compression and the sacroiliac region are relevant to the client’s symptoms. The result is more meaningful when it reproduces familiar posterior pelvic or buttock pain and when other SIJ provocation tests are also positive.

A positive result does not confirm SIJ pain, SIJ dysfunction or a specific tissue source. Symptoms may also be influenced by lumbar referral, hip-related pain, soft tissue sensitivity, general irritability or pressure intolerance.

A negative test means pelvic compression did not reproduce familiar symptoms during the test. This may reduce suspicion when combined with other negative SIJ provocation tests, but it does not fully exclude SIJ-region involvement.

Sensitivity, Specificity and Diagnostic Accuracy

In Laslett et al. (2005), the Sacroiliac Compression Test was evaluated as one of several SIJ pain provocation tests against diagnostic injection response. Commonly cited values for the individual Sacroiliac Compression Test are approximately:

• Sensitivity: 69%
• Specificity: 69%
• Positive likelihood ratio: approximately 2.2, calculated from the reported sensitivity and specificity
• Negative likelihood ratio: approximately 0.45, calculated from the reported sensitivity and specificity

These values indicate limited stand-alone diagnostic value. A positive result may slightly increase suspicion, but it does not confirm SIJ pain. A negative result may slightly reduce suspicion, but it does not exclude SIJ-region involvement.

Systematic review evidence suggests that clusters of SIJ provocation tests are generally more useful than individual tests. However, more recent meta-analysis has also cautioned that even positive provocation clusters may not provide enough certainty to confidently identify the SIJ as the source of pain. This supports using the test as part of broader assessment reasoning rather than as a stand-alone decision-making tool.

Reliability and Validity

The reliability of the Sacroiliac Compression Test depends on consistent client positioning, hand placement, force direction and symptom criteria. Results may vary if the professional applies pressure differently, if the client is positioned differently, or if familiar pain is not clearly distinguished from pressure discomfort.

Validity is limited when the test is used alone. The test compresses the pelvis and may stress the sacroiliac region, but it may also provoke symptoms from surrounding tissues or adjacent regions. Its validity improves when interpreted with other provocation tests, history and functional findings.

Common Errors and Limitations

Common errors include:

• Pressing too suddenly or aggressively
• Testing in poor side-lying alignment
• Failing to ask whether the pain is familiar
• Treating general pressure discomfort as a positive result
• Using the test alone to make a conclusion
• Not recording side tested or position used
• Ignoring lumbar or hip-related symptoms
• Failing to compare with other SIJ provocation tests

Limitations include moderate individual accuracy, overlapping pain sources, variation in technique and reliance on client symptom reporting.

Practical Applications

The Sacroiliac Compression Test can help professionals understand whether pelvic compression reproduces the client’s familiar symptoms. It is especially useful when included in a structured SIJ provocation cluster.

The test can also be useful for education and retesting. When recorded clearly in Measurz, future professionals can see exactly how the test was performed, what symptoms were reproduced and whether the response changed over time.

How to Record This in Measurz

In Measurz, record:

• Test name: Sacroiliac Compression Test
• Side tested or symptomatic side up
• Client position
• Hip and knee position
• Use of pillow or support
• Hand placement
• Force direction
• Result: positive, negative, unclear or unable to test
• Pain score before, during and after
• Symptom location
• Symptom quality
• Whether the symptom was familiar
• Guarding or compensations
• Irritability
• Reason for stopping
• Confidence in result
• Related SIJ provocation findings
• Lumbar, hip and functional assessment notes
• Retest date if relevant

Recording these details improves repeatability, communication, client education, team consistency and assessment reasoning.

Related Tests / Internal Links

• Sacral Thrust Test
• Sacroiliac Distraction Test
• Thigh Thrust Test
• Gaenslen Test
• Yeoman Test
• FABER Test
• Standing Flexion Test
• Seated Flexion Test
• Stork Test
• Lumbar ROM Assessment
• Hip ROM Assessment

FAQs

What is the Sacroiliac Compression Test used for?

It is used to assess whether pelvic compression reproduces familiar posterior pelvic or sacroiliac-region symptoms.

Does a positive Sacroiliac Compression Test confirm SIJ pain?

No. It may increase suspicion when combined with other findings, but it does not confirm SIJ pain on its own.

What is a positive Sacroiliac Compression Test?

A positive finding is reproduction of the client’s familiar posterior pelvic, buttock or SIJ-region symptoms during compression.

What is a negative Sacroiliac Compression Test?

A negative result means pelvic compression did not reproduce familiar symptoms during the test.

Why should it be used in a cluster?

Individual SIJ provocation tests have limited stand-alone accuracy. A cluster provides stronger assessment information than one isolated test.

What should be recorded in Measurz?

Record side, position, force direction, pain score, symptom location, familiar pain response, confidence and related findings.

Key Takeaways

The Sacroiliac Compression Test is a side-lying SIJ-region provocation test.
A positive result is reproduction of familiar posterior pelvic or buttock-region pain.
A single positive test does not confirm SIJ pain.
The test is more useful as part of a provocation cluster.
Measurz should capture test setup, force direction, pain score, symptom location and confidence in interpretation.

References

Laslett, M. (2008). Evidence-based diagnosis and treatment of the painful sacroiliac joint. Journal of Manual & Manipulative Therapy, 16(3), 142–152. https://doi.org/10.1179/jmt.2008.16.3.142E

Laslett, M., Aprill, C. N., McDonald, B., & Young, S. B. (2005). Diagnosis of sacroiliac joint pain: Validity of individual provocation tests and composites of tests. Manual Therapy, 10(3), 207–218. https://doi.org/10.1016/j.math.2005.01.003

Saueressig, T., Owen, P. J., Diemer, F., Zebisch, J., & Belavy, D. L. (2021). Diagnostic accuracy of clusters of pain provocation tests for detecting sacroiliac joint pain: Systematic review with meta-analysis. Journal of Orthopaedic & Sports Physical Therapy, 51(9), 422–431. https://doi.org/10.2519/jospt.2021.10469

Szadek, K. M., van der Wurff, P., van Tulder, M. W., Zuurmond, W. W. A., & Perez, R. S. G. M. (2009). Diagnostic validity of criteria for sacroiliac joint pain: A systematic review. The Journal of Pain, 10(4), 354–368. https://doi.org/10.1016/j.jpain.2008.09.014

van der Wurff, P., Buijs, E. J., & Groen, G. J. (2006). A multitest regimen of pain provocation tests as an aid to reduce unnecessary minimally invasive sacroiliac joint procedures. Archives of Physical Medicine and Rehabilitation, 87(1), 10–14. https://doi.org/10.1016/j.apmr.2005.09.023