Sacroiliac Joint Dysfunction

Lower Limb

Overview

Sacroiliac joint (SIJ) dysfunction is a common cause of lower back and buttock pain, resulting from altered biomechanics, inflammation, or hypermobility/hypomobility of the sacroiliac joint complex. It accounts for 15-30% of chronic lower back pain cases and presents with localized pain at or near the posterior superior iliac spine (PSIS), often with referred pain into the hip, thigh, or groin. Successful management requires addressing underlying postural, muscular, and biomechanical factors while considering the integral role of the SIJ in load transfer between the spine and lower limbs.

Pathophysiology

The sacroiliac joint is a synovial joint with significant load-bearing and shock-absorbing functions during gait and standing. SIJ dysfunction arises from three main mechanisms: (1) Hypermobility—excessive motion due to ligamentous laxity, muscle weakness (particularly gluteus medius, maximus, and deep core stabilizers), or hormonal factors (pregnancy-related relaxin); (2) Hypomobility—restricted motion due to muscular guarding, joint stiffness, or capsular restriction; (3) Inflammation—synovitis, capsulitis, or adjacent myofascial trigger points. Biomechanical faults in gait, posture, and load distribution increase stress through the SIJ, leading to pain, instability, and potential referred pain patterns into the lower limb via nociceptive and referred mechanisms.

Typical Presentation

Site

Unilateral or bilateral pain localized to the region of the posterior superior iliac spine (PSIS), sacral base, or lower lumbar region; may refer into the buttock, lateral hip, posterior or lateral thigh, and occasionally into the groin or lower abdomen

Quality

Deep, aching, or sharp localized pain; may be described as a 'clicking,' 'popping,' or 'catching' sensation; stiffness and heaviness are common descriptors

Intensity

Typically mild to moderate (3-6/10) at rest, exacerbated with activity; intensity varies with postural positions and activity level

Aggravating

Prolonged standing or sitting, asymmetrical loading (standing on one leg, carrying weight on one side), stair climbing, running, single-leg activities, transitional movements (sit-to-stand, rolling in bed), lateral bending, prolonged hip flexion, certain sleeping positions

Relieving

Lying down, SIJ belt application, postural support, relative rest, changing position frequently, activities requiring symmetrical bilateral loading, heat application

Associated

Stiffness and reduced mobility, hip flexor tightness, weak gluteal muscles, postural dysfunction, pelvic asymmetry, possible leg length discrepancy, limited hip internal rotation on affected side, pain with single-leg stance or loading, pain with hip abduction or external rotation testing, positive SIJ provocation tests (Patrick's test, FABER, Gillet's test, Thigh Thrust test)

Orthopaedic Tests

Test descriptions are written with AI assistance from standard clinical texts. Where a test lists Sources, its description has been checked against them; those sources are independent and do not endorse OsteoKit. Accuracy figures and grades (A–D) appear only when checked against the published study; tests without one are marked “No accuracy study”.

Further reading: full test procedures are described in standard clinical examination texts, e.g. Magee & Manske, Orthopedic Physical Assessment (7th ed.), and Cook & Hegedus, Orthopedic Physical Examination Tests: An Evidence-Based Approach (2nd ed.).

Grade D
A+ABCDLimited value: little effect on the diagnosis on its own
limited standalone value.

FABER Test (Flexion-Abduction-External Rotation)

Procedure

Patient supine. Place the ankle of the tested leg just above the opposite knee (figure-4 position). Stabilise the opposite side of the pelvis at the ASIS and apply gentle downward pressure to the bent knee.

Positive Finding

Reproduction of the patient's familiar pain over the sacroiliac joint or buttock on the tested side. Groin pain points to the hip instead.

Sensitivity / Specificity

76% (pooled, 3 studies, 319 patients)/32% (pooled)

Reference: Han CS, Hancock MJ, Sharma S, Sharma S, Harris IA, Cohen SP, et al. Low back pain of disc, sacroiliac joint, or facet joint origin: a diagnostic accuracy systematic review. EClinicalMedicine. 2023;59:101960.

Interpretation

FABER stresses both the sacroiliac joint and the hip, so pain location matters. On its own it barely changes the chance that the sacroiliac joint is the pain source. Use it as one of the provocation tests, and examine the hip if the pain is in the groin. Pooled in a 2023 systematic review (Han et al.) of patients with persistent low back pain, using anaesthetic injections into the joint as the reference. Results varied a lot between studies. On its own this test barely changes the chance that the sacroiliac joint is the source of pain. Three or more positive provocation tests perform better (pooled 81% / 68%, 6 studies). FABER also stresses the hip, which helps explain its low specificity.

Sources

Grade D
A+ABCDLimited value: little effect on the diagnosis on its own
limited standalone value.

Sacroiliac Joint Compression Test

Procedure

Patient side-lying with the painful side up, hips and knees bent. Place both hands over the upper iliac crest and press straight down towards the floor, holding for up to 30 seconds.

Positive Finding

Reproduction of the familiar pain over the sacroiliac joint or buttock.

Sensitivity / Specificity

49% (pooled, 2 studies, 83 patients)/72% (pooled)

Reference: Han CS, Hancock MJ, Sharma S, Sharma S, Harris IA, Cohen SP, et al. Low back pain of disc, sacroiliac joint, or facet joint origin: a diagnostic accuracy systematic review. EClinicalMedicine. 2023;59:101960.

Interpretation

One of the standard sacroiliac provocation tests. A single positive test adds little; the result is more useful as part of a set of provocation tests. When none of the provocation tests reproduces the pain, the sacroiliac joint is an unlikely source. Pooled in a 2023 systematic review (Han et al.) of patients with persistent low back pain, using anaesthetic injections into the joint as the reference. Results varied a lot between studies. On its own this test barely changes the chance that the sacroiliac joint is the source of pain. Three or more positive provocation tests perform better (pooled 81% / 68%, 6 studies).

Sources

Grade D
A+ABCDLimited value: little effect on the diagnosis on its own
limited standalone value.

Thigh Thrust (Sacroiliac Joint Shear) Test

Procedure

Patient supine. Flex the hip on the tested side to 90° with the knee bent. Place one hand under the sacrum to stabilise it and apply a gentle, gradually increasing force down the length of the femur, towards the plinth.

Positive Finding

Reproduction of the familiar pain over the sacroiliac joint or buttock on the tested side.

Sensitivity / Specificity

54% (pooled, 5 studies, 415 patients)/54% (pooled)

Reference: Han CS, Hancock MJ, Sharma S, Sharma S, Harris IA, Cohen SP, et al. Low back pain of disc, sacroiliac joint, or facet joint origin: a diagnostic accuracy systematic review. EClinicalMedicine. 2023;59:101960.

Interpretation

One of the standard sacroiliac provocation tests. On its own a positive result barely changes the chance that the sacroiliac joint is the source. Use it within a set of provocation tests. Avoid in pregnancy or when there is hip pathology that makes the position painful. Pooled in a 2023 systematic review (Han et al.) of patients with persistent low back pain, using anaesthetic injections into the joint as the reference. Results varied a lot between studies. On its own this test barely changes the chance that the sacroiliac joint is the source of pain. Three or more positive provocation tests perform better (pooled 81% / 68%, 6 studies).

Sources

No accuracy study

Sacroiliac Joint Palpation (Tenderness over PSIS/ASIS)

Procedure

Patient prone. Palpate the posterior superior iliac spine, the long dorsal sacroiliac ligament just below it, and the sacral sulcus on both sides. Ask whether any point reproduces the familiar pain.

Positive Finding

Tenderness that reproduces the familiar pain over the sacroiliac region, especially just below the PSIS.

Interpretation

Tenderness in this region is common in many types of low back pain, so it does not identify the sacroiliac joint on its own. Pain that the patient locates to a point just below the PSIS is typical of sacroiliac pain and supports the provocation tests.

Sources

Not a diagnostic test

Single-Leg Stance (Flamingo Test)

Procedure

Ask the patient to stand on one leg with the other hip and knee bent, for up to 30 seconds. Watch the pelvis from behind, then repeat on the other side.

Positive Finding

The pelvis drops on the side of the lifted leg, the trunk shifts over the stance leg, or the familiar sacroiliac or buttock pain appears.

Interpretation

A check of hip-abductor control and load tolerance, not a diagnostic test for the sacroiliac joint. A pelvic drop points to weak or inhibited gluteal muscles, which is useful for exercise planning.

Sources

⚠ Red Flags

  • •Signs of systemic inflammatory arthropathy (HLA-B27 positive, elevated inflammatory markers, polyarticular involvement)
  • •Severe night pain unrelieved by positional changes, suggesting malignancy or infection
  • •Progressive neurological deficit (bowel/bladder dysfunction, lower limb weakness, numbness in saddle distribution) indicating cauda equina compression
  • •Fever, malaise, or constitutional symptoms suggesting infection (osteomyelitis, septic arthritis)
  • •Significant trauma with neurological signs
  • •Progressive severe pain not responding to appropriate conservative management over 6-8 weeks with imaging findings suggestive of fracture or serious pathology

⚡ Yellow Flags

  • •Prolonged psychological distress or depression related to chronic pain
  • •High pain catastrophizing or fear-avoidance beliefs, particularly regarding movement
  • •Recent significant psychosocial stressors or life changes correlating with symptom onset
  • •Excessive healthcare utilization or 'doctor shopping' without compliance to treatment recommendations
  • •Secondary gain factors (litigation, workers' compensation) affecting treatment motivation
  • •Maladaptive pain behaviors or signs of hypervigilance to bodily sensations
  • •Poor self-efficacy regarding pain management and functional recovery

Osteopathic Techniques

Region

Sacrum (sacral rocking)

Technique

Articulation, sacrum (sacral rocking)
Grade C
Limited evidence: indirect or low-quality support only
Manual therapy reduced disability in SIJ pain (low certainty). Its effect on pain is uncertain.

Rationale

Gentle, rhythmic sacral movement timed with the breath. Used to restore sacroiliac motion.

How it's done, cautions & evidence

How it's done

Patient prone, both hands over the sacrum. The practitioner follows the sacrum with the breath and adds slight pressure at the end of each breath to exaggerate its motion. Continue for 2–3 minutes or until the tissues release, then re-check.

Cautions

Stop if it causes pain. Do not use with cancer near the sacrum, infection or inflammation, cauda equina syndrome, bone disease of the spine, or bony joint instability.

Evidence in Sacroiliac Joint Dysfunction

A 2024 review of trials in sacroiliac joint pain found manual therapy reduced disability (low certainty), but its effect on pain was uncertain (very low certainty). No trials tested sacral rocking on its own.

Region

Innominate and pubic symphysis

Technique

Muscle energy, pelvis (innominate and pubis)
Grade C
Limited evidence: indirect or low-quality support only
MET reduced pain and disability, about as much as other therapies. Small trials.

Rationale

Patient-powered correction of innominate and pubic restrictions. The most-studied manual option for SIJ pain.

How it's done, cautions & evidence

How it's done

The innominate (or pubis) is taken to its restricted barrier. The patient makes a short, gentle contraction against equal resistance (a few seconds), relaxes, and the new barrier is taken up. Repeat, then re-check pelvic landmarks. Check for pubic dysfunction first, with consent.

Cautions

Do not use if the contraction causes severe pain, with a fracture or unstable joint in the area, or after recent surgery.

Evidence in Sacroiliac Joint Dysfunction

A 2025 review found MET reduced pain and disability in sacroiliac joint dysfunction, with results similar to other therapies. A 2024 review of SIJ manual therapy found lower disability with low certainty.

Region

Sacroiliac joint (short lever)

Technique

Balanced ligamentous tension, pelvisNo trials found

Rationale

Passive and very gentle, for patients who cannot tolerate more direct techniques. Untested in SIJ dysfunction.

How it's done, cautions & evidence

How it's done

Patient supine, one hand under the sacroiliac joint and one on the ASIS. The innominate is guided through its motions to the point where the ligaments feel balanced, then held there until the tissues release. Passive and gentle.

Cautions

Do not use over a fracture, or with bone cancer or bone infection (osteomyelitis) that weakens the bone.

Evidence in Sacroiliac Joint Dysfunction

Searched 13 Oct 2026: no trials of balanced ligamentous tension or ligamentous articular strain in sacroiliac joint dysfunction.

Region

Gluteals, piriformis and lumbar paraspinals

Technique

Soft tissue, lumbar and gluteal
Grade D
Low evidence: expert consensus or could not be verified against literature
No SIJ-specific trials. Indirect evidence from low back pain only.

Rationale

Eases muscle guarding around the pelvis before or after joint techniques.

How it's done, cautions & evidence

How it's done

Hands-on soft-tissue work (kneading, stretching and sustained pressure) to the lumbar paraspinals, quadratus lumborum and gluteal muscles, usually prone or side-lying.

Cautions

Only minor side effects have been reported in trials.

Evidence in Sacroiliac Joint Dysfunction

Searched 13 Oct 2026: no trials of gluteal or lumbar soft tissue technique in sacroiliac joint dysfunction. Massage evidence comes from non-specific low back pain.

Sources

Rehabilitation Exercises

Piriformis Stretch (Supine Figure-4)

Range of MotionBeginner

Child's Pose with Pelvic Emphasis

StretchingBeginner

Hip Flexor Stretch (Lunge Position)

StretchingBeginner

Glute Bridges (Double Leg, Progressing to Single Leg)

StrengtheningBeginner

Clamshells (Gluteus Medius Activation)

StrengtheningBeginner

Side-Lying Hip Abduction

StrengtheningBeginner

Dead Bug (Core Stability and Pelvic Control)

PosturalBeginner

Quadruped (Bird-Dog) Exercise

PosturalIntermediate

Single-Leg Stance with Pelvic Stability Focus

BalanceIntermediate

Monster Walks (Lateral Band Walking with Hip Abduction)

StrengtheningIntermediate

Sidelying Clam to Leg Lift Combination

StrengtheningIntermediate

Plank Hold with Pelvic Stability

PosturalAdvanced

Referral Criteria

  • •Signs or suspicion of systemic inflammatory arthropathy (rheumatoid arthritis, ankylosing spondylitis, psoriatic arthritis)—refer to rheumatology for serological testing and imaging
  • •Progressive neurological deficit or cauda equina syndrome signs—urgent referral to neurosurgery or emergency medicine
  • •Signs of serious spinal infection (fever, elevated inflammatory markers, imaging evidence)—urgent referral to infectious disease or spinal surgeon
  • •Fracture or structural abnormality identified on imaging—refer to orthopedic surgeon or spine specialist for evaluation
  • •Failure to respond to conservative management after 6-8 weeks with significant functional limitation—refer to pain management specialist, physiatrist, or orthopedic spine specialist
  • •Pelvic or visceral pathology (unexplained pelvic pain, bowel/urinary symptoms not clearly musculoskeletal)—refer to gynecology, urology, or gastroenterology as appropriate
  • •Significant psychological or psychosocial barriers to recovery (depression, catastrophizing, fear-avoidance)—refer to mental health professional or pain psychologist
  • •Hip pathology suspected (positive FABER with anterior groin pain, imaging evidence of labral tears or osteoarthritis)—refer to orthopedic hip specialist
  • •Persistent pelvic floor dysfunction affecting continence or sexual function—refer to pelvic floor physical therapist or urogynecologist
  • •Post-traumatic SIJ dysfunction with suspected ligamentous rupture or instability requiring stabilization—refer to orthopedic or spine surgeon