The Sacroiliac Distraction Test is a supine sacroiliac-region pain provocation test. It applies an outward or posterior-lateral force through the anterior pelvis to stress the anterior sacroiliac ligaments and related pelvic structures. A positive test is reproduction of the client’s familiar posterior pelvic, buttock or sacroiliac-region symptoms. The test may increase suspicion of sacroiliac-region involvement when combined with other positive SIJ provocation tests, but it does not confirm SIJ pain on its own.
The sacroiliac joint region can be challenging to assess because symptoms from the lumbar spine, hip, posterior pelvis and sacroiliac region can overlap. The Sacroiliac Distraction Test is commonly used as part of a sacroiliac joint provocation test cluster to explore whether controlled pelvic loading reproduces familiar symptoms.
During the test, the client lies supine while the professional applies a controlled force through the anterior superior iliac spines or anterior pelvic region. This produces a gapping or distraction stress across the anterior pelvis and sacroiliac region. The key clinical question is whether the test reproduces the client’s familiar symptoms, not whether the pressure simply feels uncomfortable.
This test should be interpreted with caution. A positive result may support assessment reasoning when it fits the client’s history, pain location and other SIJ provocation findings. It should not be used as a stand-alone diagnostic test or described as confirming a sacroiliac joint condition.
Test name: Sacroiliac Distraction Test
Also known as: SIJ Distraction Test, Pelvic Gapping Test
Body region: Sacroiliac joint region, anterior pelvis and posterior pelvic region
Purpose: Assess symptom response to anterior pelvic distraction or gapping stress
Commonly associated with: SIJ-region pain provocation assessment
Positive finding: Reproduction of familiar posterior pelvic, buttock or SIJ-region symptoms
Negative finding: No reproduction of familiar symptoms
Best used with: Thigh Thrust Test, Sacroiliac Compression Test, Sacral Thrust Test, Gaenslen Test, lumbar screen and hip assessment
Key limitation: A single positive test does not confirm SIJ pain.
The Sacroiliac Distraction Test is a passive pain provocation test performed with the client lying supine. The professional applies pressure to the anterior pelvis, usually over or near the anterior superior iliac spines, in a direction intended to distract or gap the anterior sacroiliac region.
Although the test is commonly described as an SIJ test, the applied force can also stress surrounding pelvic tissues, abdominal wall structures and hip-related regions. For this reason, the test should be understood as a symptom-provocation test rather than a structure-confirming test.
The Sacroiliac Distraction Test is used to assess whether anterior pelvic loading reproduces the client’s familiar posterior pelvic or sacroiliac-region symptoms. It may be useful when a client reports buttock-region pain, posterior pelvic pain or low back pain that appears to be influenced by pelvic loading.
The test is most useful as part of a cluster. When several SIJ provocation tests reproduce the client’s familiar symptoms, suspicion of sacroiliac-region involvement may increase. When multiple provocation tests are negative, suspicion may decrease, although this still depends on the overall presentation and test quality.
The Sacroiliac Distraction Test assesses:
Symptom response to anterior pelvic distraction
Familiar posterior pelvic or buttock pain reproduction
Tolerance to supine pelvic loading
Consistency of symptoms across SIJ provocation tests
Whether pelvic gapping stress appears relevant to the client’s symptoms
Client guarding, apprehension or irritability during pelvic loading
It does not assess pelvic alignment, leg length, sacroiliac joint position or joint motion with certainty.
This test may be useful for clients with posterior pelvic pain, buttock-region symptoms, low back pain with possible pelvic contribution, or symptoms that appear to change with load transfer through the pelvis.
It is most appropriate when the client can tolerate supine lying and controlled pressure through the anterior pelvis. The test may be less appropriate when supine lying is not tolerated, symptoms are highly irritable, or there are safety concerns such as recent trauma or suspected fracture.
Use the Sacroiliac Distraction Test when:
The client reports posterior pelvic, buttock or SIJ-region symptoms
You want to assess symptom response to anterior pelvic loading
Supine positioning is safe and tolerated
The result will be interpreted with other SIJ provocation tests
You can clearly ask whether the reproduced pain is familiar
You are documenting the result as part of a broader lumbar-pelvic assessment
Use caution or avoid the test when there is recent trauma, suspected fracture, severe osteoporosis risk, inflammatory flare, severe pain irritability, recent abdominal or pelvic surgery, pregnancy-related pelvic pain requiring modified positioning, unexplained systemic symptoms, worsening neurological signs, or inability to tolerate supine pressure.
Stop the test if symptoms increase sharply, pain spreads significantly, neurological symptoms worsen, the client guards strongly, the client cannot tolerate the position, or the test response becomes unsafe or unclear.
The Sacroiliac Distraction Test requires:
Firm treatment table
Optional pillow under the knees for comfort
Pain rating scale
Symptom-location recording method
Measurz app for structured documentation
Optional video for technique review and education
Within Measurz, this test can be recorded alongside Sacroiliac Compression, Sacral Thrust, Thigh Thrust, Gaenslen, lumbar ROM, hip ROM and functional movement findings. MAT and Measurz workflows can help professionals capture the details that matter, including position, force direction, pain score, symptom location, familiar pain response and interpretation confidence.
Explain the test before beginning. Tell the client that you will apply controlled pressure through the front of the pelvis and that they should report any change in symptoms, especially whether the test reproduces their familiar pain.
Record baseline symptoms before testing, including pain score, location, symptom quality and whether symptoms are currently present.
The client lies supine on a firm table. The legs are usually relaxed and extended, although a small pillow under the knees may be used if needed for comfort. Any modification should be documented because it may alter pelvic loading.
Stand beside the client at pelvic level. Position your body so pressure can be applied smoothly, symmetrically and without sudden force.
Place the heels of both hands over the anterior superior iliac spine region or the anterior pelvis. Hand placement should be comfortable and respectful, with clear communication and appropriate consent.
Ensure the client remains relaxed and centred on the table. Avoid excessive trunk rotation, hip movement or asymmetrical pressure unless a modified test is intentionally being used and documented.
Apply a slow, controlled posterior-lateral or outward pressure through the anterior pelvis. The force should create a gapping or distraction stress through the anterior pelvic ring and sacroiliac region.
Do not bounce or thrust suddenly. Pressure should be progressive and stopped if symptoms become excessive.
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 symptom stay local, spread or change?”
“Is this pressure discomfort, or does it feel like your usual symptom?”
A positive finding is reproduction of the client’s familiar posterior pelvic, buttock or SIJ-region symptoms during the test.
A negative finding is no reproduction of familiar symptoms during the test.
Stop if symptoms increase sharply, pain spreads significantly, neurological symptoms worsen, the client guards strongly, the client reports distress, or the test cannot be performed safely.
Avoid excessive pressure, especially in highly irritable presentations. Do not interpret general anterior pelvic pressure discomfort as a clear positive result. The test is more meaningful when it reproduces the client’s familiar posterior pelvic or buttock-region symptoms.
A positive Sacroiliac Distraction Test may increase suspicion that the sacroiliac region is relevant to the client’s symptoms, particularly when it reproduces familiar posterior pelvic or buttock pain and other SIJ provocation tests are also positive.
A positive result does not confirm SIJ pain, SIJ dysfunction or a specific tissue source. The test can load multiple structures, and symptoms may be influenced by lumbar referral, hip-region sensitivity, anterior pelvic pressure sensitivity, soft tissue irritation or general pain irritability.
A negative test means anterior pelvic distraction 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 sacroiliac-region involvement. Interpretation is stronger when the result is consistent with history, pain location, lumbar screen, hip assessment and other SIJ provocation tests.
In Laslett et al. (2005), the Sacroiliac Distraction Test was evaluated as one of six SIJ provocation tests against a reference standard of intra-articular anaesthetic SIJ injection response. Reported individual values for the Distraction Test were:
Population: People with buttock pain with or without low back pain referred for SIJ assessment
Test variation: Supine pelvic distraction provocation test
Reference standard: Intra-articular SIJ anaesthetic block response
Sensitivity: 0.60
Specificity: 0.81
Positive likelihood ratio: 3.20
Negative likelihood ratio: 0.49
Key limitation: False positives occurred, and the test was more useful as part of a cluster than as an isolated test.
These values suggest that the Sacroiliac Distraction Test has better specificity than sensitivity in that study. A positive finding may increase suspicion, but not enough to confirm SIJ pain on its own. A negative finding does not reliably exclude SIJ-region involvement.
Laslett et al. also reported that composites of provocation tests performed better than individual tests. In that study, three or more positive tests out of six had reported sensitivity of 0.94 and specificity of 0.78. Two or more positive tests from four selected tests — distraction, thigh thrust, compression and sacral thrust — had sensitivity of 0.88 and specificity of 0.78.
More recent systematic review evidence has recommended caution, noting that positive SIJ provocation clusters may not provide enough certainty to confidently rule in the SIJ as the pain source. This supports using the Sacroiliac Distraction Test as part of broader assessment reasoning rather than a stand-alone decision-making tool.
The Sacroiliac Distraction Test has more practical value when performed consistently and interpreted as part of a provocation test cluster. Reliability may be influenced by hand placement, force direction, amount of pressure, client relaxation, symptom irritability and whether the examiner clearly distinguishes familiar pain from general pressure discomfort.
Validity is limited when the test is used alone. Although it applies stress to the pelvic ring and sacroiliac region, the test does not isolate the SIJ from all surrounding structures. A positive result indicates symptom reproduction during pelvic distraction loading, not confirmation of a single pain source.
Common errors include:
Applying force too quickly or aggressively
Pressing over an uncomfortable anterior pelvic area without clarifying symptom relevance
Treating pressure discomfort as a positive test
Failing to ask whether the symptom is familiar
Using the test in isolation
Not recording force direction or position
Ignoring lumbar or hip-related symptom contributors
Continuing when symptoms worsen sharply
Assuming the result confirms SIJ dysfunction
Limitations include variable technique, moderate individual diagnostic accuracy, symptom overlap between lumbar, hip and pelvic sources, and reliance on client symptom reporting.
The Sacroiliac Distraction Test can help professionals assess whether anterior pelvic loading reproduces familiar symptoms. It is most useful when included in a structured SIJ provocation cluster and when the result is interpreted alongside the client’s history and functional presentation.
For education and retesting, the test helps reinforce the importance of recording symptom behaviour rather than simply labelling a test positive or negative. When recorded well in Measurz, the result can be compared across sessions and shared more clearly within a professional team.
In Measurz, record:
Test name: Sacroiliac Distraction Test
Client position
Knee or hip support used
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
Whether symptoms spread, centralised or changed
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, assessment reasoning, team consistency and reporting quality.
Sacroiliac Compression Test
Sacral Thrust Test
Thigh Thrust Test
Gaenslen Test
Yeoman Test
FABER Test
Standing Flexion Test
Seated Flexion Test
Stork Test
Lumbar ROM Assessment
Hip ROM Assessment
It is used to assess whether anterior pelvic distraction reproduces familiar posterior pelvic, buttock or sacroiliac-region symptoms.
No. A positive result may increase suspicion when it matches the client’s symptoms and other SIJ provocation tests, but it does not confirm SIJ pain on its own.
A positive finding is reproduction of the client’s familiar posterior pelvic, buttock or SIJ-region pain during anterior pelvic distraction.
A negative result means the test did not reproduce familiar symptoms. It does not fully exclude sacroiliac-region involvement.
Familiar pain is more meaningful than general pressure discomfort because it better matches the client’s presenting symptoms.
No. It is best interpreted as part of an SIJ provocation cluster and a broader lumbar, hip and functional assessment.
Record position, hand placement, force direction, pain score, symptom location, familiar pain response, confidence and related findings.
The Sacroiliac Distraction Test is a supine SIJ-region provocation test.
A positive finding is reproduction of familiar posterior pelvic or buttock-region symptoms.
The test has moderate individual diagnostic value and should not be used alone.
It is more useful when interpreted as part of a provocation cluster.
Measurz should capture force direction, symptom response, pain score, familiar pain and related findings.
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
