Sacroiliac Joint Pain: What Causes It and How Physiotherapy in Calgary Can Help (2026 Update)

Primary Keyword: SI joint pain physiotherapy Calgary  ·  Secondary: sacroiliac joint pain Calgary, pelvic girdle pain physio, postpartum SI pain MacLeod Trail, South Calgary SIJ treatment.

Author: Colin Bouma, PT, FCAMPT  ·  Updated for 2026

Sacroiliac (SI) joint pain is one of the most over-diagnosed and over-explained conditions in physiotherapy. Most patients arrive having been told their SI joint is "out of alignment," that one side of their pelvis is "rotated," or that their leg length is uneven and that is why their back hurts. Most of that is not what the evidence actually says.

I am Colin Bouma, an FCAMPT-certified physiotherapist (the highest manual therapy designation in Canada) practising on MacLeod Trail SW. This is the 2026 update to one of our most-read posts, rebuilt around what current research — including a 2021 JOSPT systematic review and meta-analysis on SI joint diagnosis — actually shows. The honest version is more useful than the popular one.

What the SI Joint Actually Is

The sacroiliac joints connect your sacrum (the triangular bone at the base of your spine) to the two ilia (the wings of your pelvis). They are large, irregular joints supported by some of the densest ligaments in the body. They transfer load between your spine, pelvis, and legs and absorb shock during walking and running (Vleeming et al., 2008).

How much motion do they actually have? A few degrees of rotation and a few millimetres of translation under load — meaningful for shock absorption, not enough to "subluxate" or "go out" in the way many patients have been told. Imaging studies using radiostereometric analysis have shown that manipulation does not measurably change the position of the sacrum relative to the ilium, even when patients' symptoms improve. The "putting the joint back in" narrative is theatre, not mechanism.

What Can Actually Cause SI Joint Pain

•      Pregnancy and postpartum hormonal and load changes — pelvic girdle pain is one of the most well-defined SI-region conditions.

•      Traumatic injury — falls, motor vehicle collisions, sudden axial loading.

•      Inflammatory conditions — ankylosing spondylitis and other spondyloarthropathies cause genuine sacroiliitis and warrant rheumatologic input.

•      Post-surgical changes — lumbar fusions, especially long fusions to the sacrum, increase load on the SI joints.

•      Mechanical overload — chronic asymmetric loading, sudden activity changes, or returning to high-impact activity after deconditioning.

•      Sometimes — no clear trigger, just a sensitized joint that responds to load.

Diagnosing SI Joint Pain: What Actually Works

The gold standard for diagnosing SI joint pain is an image-guided diagnostic injection that anaesthetizes the joint — if the pain disappears, the joint is the source. Most patients never need this. Clinically, the most useful tool is the cluster of pain provocation tests described by Laslett: distraction, thigh thrust, compression, sacral thrust, and Gaenslen's. Three or more positive tests have reasonable diagnostic value for SI joint pain (Laslett, 2008).

A 2021 JOSPT systematic review and meta-analysis confirmed that test clusters perform meaningfully better than individual tests, but the certainty of evidence is low and the post-test probability of SI joint pain even with a positive cluster is modest (Saueressig et al., 2021). Translation: the cluster helps but is not a slam dunk. Good clinical reasoning matters more than any single test.

What the Evidence Does Not Support

•      Palpation and motion testing for "alignment." Inter-rater reliability for palpating SI joint position and motion is poor. Clinicians often disagree about which side is "out." The thing being measured is not measurable with the tools being used.

•      The "subluxation" / "out of alignment" model. When patients' symptoms improve after manipulation, the joint's position has not actually changed. The mechanism of benefit is more likely neurological (modulating pain processing, reducing muscle guarding) than mechanical realignment.

•      Routine "leg length discrepancy" as a primary driver. Mild leg length differences are extremely common and usually do not cause pain. True structural differences of 2 cm or more occasionally matter; smaller "functional" differences attributed to pelvic torsion rarely do.

•      Generic "pelvic alignment" techniques as treatment. Useful when used as one short-term modality to reduce sensitivity and let you move — not as a recurring "you're out again, let's pop you back" service.

What Actually Helps SI Joint Pain

1.     Education and reassurance. Understanding that your SI joint is not unstable, fragile, or chronically "out" is one of the most powerful interventions in the literature.

2.     Progressive loading. Hip strength (especially gluteus medius and maximus), trunk endurance, posterior chain capacity. The pelvis tolerates load better when the muscles around it are strong.

3.     Movement variety. Avoid prolonged static postures that aggravate symptoms (long single-leg standing, asymmetric sitting). Change positions often.

4.     Targeted manual therapy. As an adjunct to reduce sensitivity and improve tolerance to loading — not as a stand-alone treatment.

5.     Pelvic belts in specific contexts. Genuinely useful for some patients with pregnancy-related pelvic girdle pain and post-traumatic instability. Not a universal tool.

6.     Image-guided injection for select cases. Reasonable when conservative care is not progressing and the diagnosis needs confirming — best done by a physician with imaging guidance.

Pregnancy and Postpartum Pelvic Girdle Pain

Pregnancy-related pelvic girdle pain (PGP) is the closest thing to a true "SI joint" syndrome in the population we see. The European guidelines, developed by Vleeming and colleagues, recommend individualized exercise, education and reassurance, and adjuncts like a pelvic belt where appropriate (Vleeming et al., 2008). Most PGP improves within 3-6 months postpartum, though a meaningful minority persist longer and benefit from structured rehab. For postpartum patients, integration of pelvic floor assessment alongside SI care matters — they are commonly linked.

When SI Joint Pain Needs Medical Attention

•      Bilateral, persistent SI/buttock pain with morning stiffness lasting more than 30 minutes — possible spondyloarthropathy, especially in younger adults; consider rheumatology referral.

•      SI pain following recent significant trauma (fall, MVA) — image to rule out fracture.

•      Pain with fever, unexplained weight loss, or a history of cancer.

•      Progressive neurological symptoms — numbness, weakness, bowel or bladder changes.

•      Severe postpartum pain that is not improving by 6 months — warrants assessment beyond standard PGP recovery.

How We Treat SI Joint Pain at Our Calgary Clinic

7.     Real assessment. Pain provocation cluster, screening for lumbar and hip contributors, neurological screen, red-flag screen, and an honest conversation about what current evidence supports.

8.     Education that calibrates expectations. You will leave understanding what the SI joint does and does not do, and why "out of alignment" language has been retired by current research.

9.     Progressive loading. Targeted strength for the hips, trunk, and posterior chain, scaled to where you are. Two to three sessions a week, designed to fit your life.

10.  Manual therapy and gentle SI-region work as needed. To reduce sensitivity so you can load and move — not as recurring "realignment."

11.  Pregnancy-specific care. Targeted PGP rehab, pelvic belt fitting when indicated, coordination with pelvic-floor physiotherapy if needed.

12.  Outcome tracking. Pain scores, functional measures, return to activity — measured, not guessed.

Why Choose Our Clinic on MacLeod Trail?

We are at 8989 MacLeod Trail SW, serving Haysboro, Kingsland, Fairview, Acadia, and the surrounding South Calgary neighbourhoods. We treat a lot of SI-region pain — postpartum patients, runners, lifters, post-MVA patients, and adults who have been told for years that their pelvis is "out" and who deserve a more honest framework. As an FCAMPT-certified clinician, I bring advanced manual therapy and clinical-reasoning training to every assessment.

Book an SI Joint Assessment

If your low back, buttock, or pelvic pain has been bothering you for more than a few weeks, has not improved with the standard "pop it back in" approach, or is interfering with your activity, get assessed with a current framework. Most patients see meaningful change inside the first three to four sessions when the plan is matched to the actual problem.

This article is for general educational purposes only. It is not medical advice, does not replace individualized assessment by a qualified healthcare professional, and does not create a physiotherapist–patient relationship. Always consult a regulated healthcare provider before starting a new exercise program or making changes to your care.

Bibliography

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.2008.16.3.142

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

Vleeming, A., Albert, H. B., Östgaard, H. C., Sturesson, B., & Stuge, B. (2008). European guidelines for the diagnosis and treatment of pelvic girdle pain. European Spine Journal, 17(6), 794–819. https://doi.org/10.1007/s00586-008-0602-4