Physiotherapy for sacroiliac joint pain uses targeted exercises, hands-on manual therapy, and posture training to stabilise the pelvis and reduce stress on the sacroiliac (SI) joint. The sacroiliac joint connects the base of the spine to the pelvis, and when it moves too much or too little, pain develops in the lower back, buttock, and sometimes the leg. A physiotherapist identifies the root cause of SI joint dysfunction, then builds a treatment plan around core strengthening, joint mobilisation, stretching, and patient education to restore pain-free movement. This article covers how SI joint pain develops, how physiotherapy treats it, which exercises help most, and what to expect during recovery.

What Is Sacroiliac Joint Pain and What Causes It?

Sacroiliac joint pain is pain that starts where the sacrum, the triangular bone at the base of the spine, connects to the ilium, the large pelvic bone, on either side of the body. Every person has two sacroiliac joints. These two joints transfer force between the upper body and the lower limbs during walking, standing, and bending. The sacroiliac joint is a synovial joint with very limited motion, typically only a few degrees of rotation, according to a 2020 study published in the International Journal of Spine Surgery (Kiapour et al.). That limited motion is what makes the sacroiliac joint stable enough to absorb shock from each step you take.

Sacroiliac joint pain develops when the joint either moves too much (hypermobility) or too little (hypomobility). Hypermobility of the sacroiliac joint occurs when the ligaments holding the joint together become loose, often from injury, repetitive strain, or hormonal changes during pregnancy. Hypomobility of the sacroiliac joint results from stiffness caused by ageing, arthritis, or scar tissue from prior surgery. Both types of sacroiliac joint dysfunction produce pain in the lower back, buttock, and sometimes the groin or thigh.

Research published in Pain Practice (Szadek et al., 2024) reports that sacroiliac joint pain accounts for 15% to 30% of all mechanical low back pain cases. According to StatPearls (Dydyk et al., 2022), 88% of sacroiliac joint injuries result from repetitive microtrauma or acute trauma, 20% of cases are pregnancy-related, and 4% are idiopathic. Low back pain itself affected 619 million people globally in 2020, according to the Global Burden of Disease Study published in The Lancet Rheumatology, making it the leading cause of years lived with disability worldwide since 1990. The sacroiliac joint is a significant contributor to that global burden.

How to Tell If Pain Is Coming from the SI Joint

Pain coming from the sacroiliac joint typically presents as a deep, one-sided ache in the lower back or buttock that worsens with position changes like standing up from a chair, climbing stairs, or rolling over in bed. Sacroiliac joint pain often stays below the waistline and above the knee. The pain intensifies with prolonged sitting, standing on one leg, or forward bending. Tenderness near the posterior superior iliac spine (PSIS), the bony bump you can feel at the back of your pelvis, is a reliable indicator that the sacroiliac joint is the source of the discomfort.

Sacroiliac joint pain is notoriously difficult to diagnose because its symptoms overlap with several other conditions. A physiotherapist uses a cluster of provocation tests, including the distraction test, compression test, thigh thrust, sacral thrust, and Gaenslen’s test, to assess SI joint involvement. A 2008 study published in the Journal of Manual and Manipulative Therapy (Laslett) found that when three or more of these provocation tests are positive, the diagnostic sensitivity reaches 91% and specificity reaches 78%. No single test is reliable on its own, which is why the cluster approach matters.

What Can Be Mistaken for SI Joint Pain?

Sacroiliac joint pain can be mistaken for sciatica, lumbar disc herniation, piriformis syndrome, hip bursitis, lumbar facet syndrome, and even early-stage ankylosing spondylitis. The sharp, shooting quality of SI joint pain down the posterior thigh closely mimics radicular pain from a sciatica presentation. The key difference is that sacroiliac joint pain rarely extends below the knee, while true sciatica often radiates into the calf and foot. Sacroiliac joint pain also lacks the neurological deficits, such as numbness, tingling, or muscle weakness, that accompany nerve root compression. A thorough movement assessment separates SI joint dysfunction from these mimics, and that assessment is the first step in any physiotherapy treatment plan.

Can Physiotherapy Help with Sacroiliac Joint Dysfunction?

Yes, physiotherapy helps with sacroiliac joint dysfunction by strengthening the muscles that stabilise the pelvis, restoring normal joint mobility through manual therapy, and correcting the movement patterns that caused the dysfunction in the first place. A 2017 systematic review published in the Journal of Physical Therapy Science (Al-Subahi et al.) confirmed that physiotherapy interventions, including exercise, manipulation, and kinesio tape, are effective in reducing pain, decreasing disability, and restoring normal pelvic symmetry in patients with sacroiliac joint dysfunction.

A 2019 randomised controlled trial published in Pain Physician (Nejati et al.) found that combining exercise therapy with manipulation produced significant improvements in both pain and functional ability for SI joint dysfunction patients. More recently, a 2024 study in Frontiers in Physiology (Yan et al.) demonstrated that core stability exercises combined with Mulligan’s mobilisation with movement techniques significantly reduced SI joint pain and disability over a six-week treatment period. The evidence consistently supports physiotherapy as a first-line treatment for sacroiliac joint dysfunction.

What Does a Physiotherapy Assessment for SI Joint Pain Involve?

A physiotherapy assessment for sacroiliac joint pain involves a detailed process that identifies the specific cause and contributing factors of your SI joint dysfunction. The assessment typically follows these steps:

1. A thorough health history review covering your pain location, onset, aggravating activities, past injuries, pregnancy history, and daily movement habits.
2. A postural and gait analysis to identify asymmetries in how you stand, walk, and shift weight between your legs.
3. A cluster of SI joint provocation tests (distraction, compression, thigh thrust, sacral thrust, Gaenslen’s) to confirm the joint is the pain source.
4. A hip and lumbar spine range-of-motion assessment to rule out referred pain from adjacent structures.
5. Muscle strength testing of the glutes, core, hamstrings, and hip rotators to identify weakness contributing to SI joint instability.
6. A leg length measurement, since leg length discrepancy is a known risk factor for sacroiliac joint dysfunction according to StatPearls (Raj and Varacallo).

The results of this assessment determine whether your sacroiliac joint is hypermobile, hypomobile, or both, and that distinction shapes your entire treatment plan. A hypermobile SI joint needs strengthening and stabilisation. A hypomobile SI joint needs mobilisation and stretching. Many patients present with a combination, where one side is too stiff and the other compensates by becoming too loose.

What Is the Best Exercise to Relieve Sacroiliac Joint Pain?

The best exercise to relieve sacroiliac joint pain is the glute bridge, because it directly strengthens the gluteus maximus, the largest muscle supporting the sacroiliac joint, while simultaneously activating the deep core stabilisers. A 2018 study published in the International Journal of Sports Physical Therapy (Added et al.) found that gluteus maximus strengthening produced significant pain reduction and functional improvement in patients with sacroiliac dysfunction. The glute bridge is the foundation exercise that most physiotherapists prescribe first because it is safe, requires no equipment, and can be performed at any fitness level.

Beyond the glute bridge, a complete exercise rehabilitation programme for sacroiliac joint pain targets four muscle groups: the gluteus maximus and gluteus medius for pelvic support, the transversus abdominis and lumbar multifidus for deep core stability, the hamstrings for posterior pelvic control, and the hip rotators for rotational stability. The bird dog exercise strengthens both the back extensors and the glutes while training the core to maintain a neutral spine. The dead bug exercise isolates the deep abdominal muscles without loading the SI joint. The clamshell exercise targets the gluteus medius, which controls lateral pelvic stability during single-leg activities like walking and stair climbing. A 2014 study in the Journal of Physical Therapy Science (Yoo) showed that individual gluteus medius strengthening exercises improved sacroiliac joint stability in patients with SI joint pain.

Exercise	Primary Target Muscle	Difficulty	Best For
Glute Bridge	Gluteus Maximus	Beginner	Building foundational pelvic support
Bird Dog	Erector Spinae + Core	Beginner to Intermediate	Improving spinal stability and coordination
Dead Bug	Transversus Abdominis	Beginner to Intermediate	Deep core activation without SI joint loading
Clamshell	Gluteus Medius	Beginner	Lateral pelvic stability during walking
Side Plank (from knees)	Obliques + Hip Abductors	Intermediate	Reducing lateral SI joint strain
Hip Thrust	Gluteus Maximus + Hamstrings	Intermediate to Advanced	Maximum glute strength for pelvic control

Sources: International Journal of Sports Physical Therapy (Added et al., 2018), Journal of Physical Therapy Science (Yoo, 2014), Frontiers in Physiology (Yan et al., 2024)

What Are the Worst Exercises for SI Joint Pain?

The worst exercises for sacroiliac joint pain are heavy barbell squats, deep lunges, sit-ups with full spinal flexion, high-impact running on hard surfaces, and any asymmetrical movement that forces one leg significantly farther forward or sideways than the other. These exercises place uneven or excessive shear force across the sacroiliac joint, aggravating an already irritated joint surface. Sit-ups and crunches flex the lumbar spine under load, which increases anterior pelvic tilt and compresses the SI joint. Running on concrete transmits repetitive impact directly through the pelvis with each stride. Heavy squats load the sacroiliac joint with hundreds of pounds of compressive and shear force simultaneously. A physiotherapist modifies or replaces these exercises with safer alternatives that build the same muscle groups without overloading the SI joint.

Does Sitting Worsen SI Joint Pain?

Yes, prolonged sitting worsens sacroiliac joint pain because a seated position places the pelvis in posterior tilt, reduces gluteal activation, and increases sustained compression across the SI joint. Sitting for more than 30 minutes without moving allows the muscles supporting the pelvis to deactivate, leaving the ligaments and joint capsule to absorb forces they are not designed to handle alone. The result is increased stiffness, inflammation, and pain that intensifies when you finally stand up. Patients with sacroiliac joint dysfunction often report that the transition from sitting to standing is the most painful moment of their day.

Small changes to your sitting habits make a measurable difference. Stand up and walk for 30 to 60 seconds every 20 to 30 minutes. Sit on a firm, flat surface rather than a soft couch that lets your pelvis sink unevenly. Place a small cushion or rolled towel behind your lower back to maintain a neutral lumbar curve. Avoid crossing your legs, because crossing shifts your pelvis asymmetrically and loads one sacroiliac joint more than the other. These adjustments reduce sustained SI joint compression and allow the surrounding muscles to remain active throughout the day.

What Is the Best Sleeping Position for SI Joint Pain?

The best sleeping position for sacroiliac joint pain is on your back with a pillow under your knees, because this position keeps the pelvis in neutral alignment and reduces tension on the SI joint ligaments. Side sleeping works well with a firm pillow between the knees to prevent the top leg from pulling the pelvis into rotation. Sleeping on your stomach is the worst position for SI joint pain because it forces the lumbar spine into extension and rotates the pelvis unevenly, placing prolonged asymmetric stress on both sacroiliac joints throughout the night.

What Not to Do with Sacroiliac Pain?

What not to do with sacroiliac pain includes avoiding prolonged static postures, skipping your prescribed exercises, lifting heavy objects with a rounded back, crossing your legs while sitting, and pushing through sharp pain during activity. Resting completely is also counterproductive. Complete rest weakens the muscles supporting the SI joint and increases stiffness, making the dysfunction worse over time. Controlled, guided movement prescribed by a physiotherapist is the most effective path to recovery.

Does Walking Aggravate SI Joint Pain?

Walking does not usually aggravate sacroiliac joint pain when performed on flat, even surfaces at a moderate pace. Gentle walking is one of the first activities physiotherapists recommend because it promotes blood flow to the pelvic region, activates the gluteal muscles, and maintains joint mobility without excessive load. The key is keeping your stride length natural. Overstriding, walking too fast, or walking on hilly or uneven terrain places asymmetric force through the pelvis that can flare up an irritated SI joint.

Swimming and stationary cycling are excellent low-impact aerobic alternatives for patients whose sacroiliac joint pain flares with walking. Both activities maintain cardiovascular fitness and muscle endurance without the repetitive ground-reaction forces that walking and running produce. A physiotherapist recommends the appropriate activity level based on your specific presentation, because the right amount of movement accelerates healing while too much movement delays it.

What Causes Sacroiliitis to Flare Up?

Sacroiliitis flares up due to sudden increases in physical activity, prolonged sitting or standing, repetitive asymmetric loading, hormonal changes, cold weather, and emotional stress that increases muscle tension around the pelvis. Common triggers include:

• Lifting a heavy object from one side of the body, such as carrying a child on one hip
• Stepping off a curb or missing a stair, which jolts one SI joint with sudden force
• Sitting cross-legged or in a slouched position for hours
• Starting a new exercise programme too aggressively without proper progression
• Sleeping on a mattress that sags unevenly
• Returning to high-impact activity too soon after an injury or flare

Understanding your personal flare triggers is a critical part of long-term sacroiliac joint pain management. A physiotherapist helps you identify which activities and postures consistently provoke your symptoms, then builds a prevention strategy around modifying or eliminating those triggers. Prevention is always more effective than treatment after a flare has already started.

Is SI Joint Pain Common During Pregnancy?

Yes, sacroiliac joint pain is very common during pregnancy, affecting an estimated 20% of pregnant women at any given point during the antenatal period, according to a 2021 review published in Cureus. A study by Filipec et al. (2018) in the International Journal of Gynaecology and Obstetrics reported that the incidence of sacroiliac joint pain during pregnancy reaches 78.7%. Pregnancy hormones, particularly relaxin and oestrogen, increase ligament laxity throughout the pelvis to prepare for delivery. That increased laxity makes the sacroiliac joints less stable and more vulnerable to pain, especially during the second and third trimesters when the growing uterus shifts the body’s centre of gravity forward.

Most pregnancy-related sacroiliac joint pain resolves within four months after delivery. However, 8% to 10% of women with pelvic girdle pain continue to experience symptoms one to two years postpartum, according to research published in PubMed (2021). A more recent study cited in PMC (Haq et al., 2024) found that the prevalence of SI joint pain in postpartum women is 66.4%. Pelvic floor therapy and targeted physiotherapy during pregnancy and the postpartum period help stabilise the pelvis, reduce pain, and restore functional strength before compensatory movement patterns become chronic. Here in Markham, we see many new mothers who benefit from early intervention for SI joint dysfunction before it becomes a long-term issue.

Is Massage Good for Sacroiliac Joint Pain?

Yes, massage therapy is good for sacroiliac joint pain because it reduces muscle tension in the gluteals, piriformis, hip rotators, and lower back muscles that tighten around an irritated SI joint. Tight muscles pull unevenly on the pelvis and increase compression across the sacroiliac joint. Therapeutic massage releases that tension, improves circulation to the affected area, and reduces the guarding response that keeps muscles locked in spasm around the painful joint. Massage works best as a complement to physiotherapy, not a replacement. Releasing tight muscles makes it easier to perform the strengthening exercises that address the underlying instability.

Can Acupuncture Help SI Joint Pain?

Acupuncture helps sacroiliac joint pain by stimulating the nervous system, reducing local inflammation, and promoting the body’s natural pain-relief mechanisms. Many physiotherapy clinics incorporate acupuncture or dry needling as part of a multimodal treatment plan for SI joint dysfunction. Laser therapy is another adjunct modality that accelerates tissue healing and reduces inflammation at the cellular level. Combining manual therapy, exercise, acupuncture, and laser therapy addresses sacroiliac joint pain from multiple angles simultaneously, which produces faster and more durable results than any single treatment alone.

How Long Does It Take for Sacroiliac Joint Pain to Heal?

Sacroiliac joint pain takes four to eight weeks to heal with consistent physiotherapy for most patients, though chronic or complex cases take longer. Mild sacroiliac joint irritation from a single incident often responds within two to four weeks of guided treatment. Chronic SI joint dysfunction that has been present for months or years requires a longer rehabilitation programme, typically eight to twelve weeks or more, because the compensatory movement patterns and muscle imbalances take time to correct. According to SI-BONE, a research-focused orthopaedic organisation, most patients notice improvement within the first several physiotherapy sessions and continue improving until they achieve pain-free function.

Will I Ever Get Rid of My Sacroiliac Joint Pain?

Yes, most people get rid of sacroiliac joint pain with the right combination of physiotherapy, exercise, and lifestyle modification. The sacroiliac joint responds well to conservative treatment when the underlying cause, whether it is muscle weakness, ligament laxity, postural dysfunction, or a movement pattern issue, is identified and addressed directly. A 2025 systematic review and meta-analysis published in ScienceDirect confirmed that physiotherapy interventions are effective in managing pain and restoring functional disability in sacroiliac joint dysfunction patients. The patients who achieve the best long-term outcomes are those who continue their home exercise programme after their physiotherapy sessions end.

How Long Is Too Long for SI Joint Pain?

Sacroiliac joint pain that persists beyond six months despite consistent conservative treatment warrants further evaluation. At that point, your physiotherapist or physician may recommend diagnostic imaging, corticosteroid injections into the SI joint, or referral to a pain specialist or orthopaedic surgeon. Radiofrequency ablation, which disables the nerve fibres carrying pain signals from the SI joint, is another option for patients who respond to diagnostic injections but do not achieve lasting relief from physiotherapy alone. The important point is that prolonged SI joint pain does not mean the condition is untreatable. It means the treatment approach needs to be reassessed and potentially escalated.

Can SI Joint Pain Come Back After Physiotherapy?

Sacroiliac joint pain can come back after physiotherapy, if the factors that caused the original dysfunction, such as weak glutes, poor core stability, prolonged sitting habits, or repetitive asymmetric loading, return. This is why the maintenance phase of physiotherapy is just as important as the active treatment phase. Your physiotherapist prescribes a home exercise programme specifically designed to maintain the strength and stability gains achieved during your in-clinic sessions. Patients who perform their home exercises consistently, typically three to four times per week, experience significantly lower recurrence rates than patients who stop exercising after their pain resolves.

Home-based physiotherapy plays a growing role in long-term sacroiliac joint pain management. A home programme includes the core strengthening exercises, stretches, and postural habits you learned during your physiotherapy sessions, adapted so you can perform them independently without equipment. Home physiotherapy works because sacroiliac joint stability depends on daily muscle activation patterns, not just occasional in-clinic treatments. The exercises you do between sessions account for far more cumulative training volume than the sessions themselves. At our Markham clinic, we build every treatment plan with a home programme component from the very first visit, because lasting recovery happens between appointments, not just during them.

Biomechanical factors like leg length discrepancy, foot pronation, and gait asymmetry also contribute to SI joint pain recurrence. Custom orthotics correct alignment issues from the ground up, redistributing forces through the pelvis more evenly and reducing the mechanical stress that triggers sacroiliac joint flares. Chiropractic care can complement physiotherapy by addressing spinal and pelvic alignment through adjustments that restore joint position. A multidisciplinary approach that combines physiotherapy, exercise rehabilitation, orthotics, and manual therapy produces the most complete and durable recovery from sacroiliac joint dysfunction.

Frequently Asked Questions

What Kind of Doctor Should I See for Sacroiliac Pain?

The kind of doctor you should see for sacroiliac pain is a physiotherapist or a chiropractor, both of whom are primary care practitioners in Canada and can assess, diagnose, and treat SI joint dysfunction without a referral. A family physician can also evaluate sacroiliac pain and refer you for imaging or specialist consultation. For persistent cases that do not respond to conservative treatment, a physiatrist (physical medicine and rehabilitation specialist), orthopaedic surgeon, or pain management specialist provides additional diagnostic and treatment options including injections, radiofrequency ablation, and in rare cases, surgical fusion.

Can Physio Fix SI Joint Pain?

Yes, physio can fix sacroiliac joint pain in the majority of cases. A 2017 systematic review in the Journal of Physical Therapy Science confirmed that physiotherapy interventions significantly reduce pain, decrease disability, and restore pelvic symmetry in patients with sacroiliac joint dysfunction. Most patients respond well to a programme of manual therapy, targeted strengthening, and patient education from a qualified physiotherapist without needing injections or surgery.

How Does SI Joint Pain Differ from Sciatica?

Sacroiliac joint pain differs from sciatica in that SI joint pain stays in the lower back, buttock, and upper thigh, rarely extending below the knee, while sciatica follows the sciatic nerve pathway down the leg into the calf and foot. Sciatica also produces neurological symptoms like numbness, tingling, or weakness in the affected leg. Sacroiliac joint pain does not cause neurological deficits because the dysfunction is in the joint itself, not in a spinal nerve root.

What Exercises Should I Avoid with Sacroiliac Joint Dysfunction?

Exercises to avoid with sacroiliac joint dysfunction include heavy barbell squats and deadlifts, deep forward lunges, traditional sit-ups and crunches, high-impact running, plyometric jumps, and any movement that spreads the legs far apart in an asymmetric pattern. These exercises place excessive shear, compression, or rotational force on the sacroiliac joint. Replace them with controlled, symmetrical strengthening exercises like glute bridges, bird dogs, and side planks from the knees.

How Many Physiotherapy Sessions Do I Need for SI Joint Pain?

Most patients with sacroiliac joint pain need six to twelve physiotherapy sessions spread over four to eight weeks. Mild cases may resolve in fewer sessions, while chronic or complex cases may require a longer programme. Your physiotherapist re-evaluates your progress at regular intervals and adjusts the treatment plan based on your response. After the active treatment phase, a transition to a home exercise programme maintains your gains long-term.

Can SI Joint Pain Come Back After Physiotherapy?

Sacroiliac joint pain can come back after physiotherapy, if the contributing factors such as weak core muscles, poor posture habits, or repetitive strain are not maintained. Patients who continue their prescribed home exercise programme three to four times per week after completing physiotherapy experience significantly lower recurrence rates than those who stop exercising once their pain resolves.

Putting It All Together

Sacroiliac joint pain is one of the most common and most overlooked sources of low back pain. The sacroiliac joint accounts for up to 30% of mechanical low back pain cases, yet it is frequently misdiagnosed as sciatica, hip bursitis, or a lumbar disc problem. Physiotherapy addresses sacroiliac joint dysfunction at its source by identifying whether the joint is too mobile or too stiff, strengthening the muscles that stabilise the pelvis, restoring normal joint mechanics through manual therapy, and teaching you the movement habits and exercises that keep the pain from returning.

Recovery from sacroiliac joint pain is achievable for the vast majority of patients. The combination of targeted exercise, hands-on treatment, lifestyle modification, and a consistent home programme produces durable results that survive the demands of daily life, work, and sport. If sacroiliac joint pain has been limiting how you move, sit, sleep, or exercise, a physiotherapy assessment is a practical place to start. Our team at KC Rehab is here to help you move better and stay that way.