Sacroiliac joint (SIJ) pain is one of the most commonly overlooked causes of lower back and leg pain. Many people experience sacroiliac joint dysfunction for months or even years, treating it as generic back pain or sciatica, without realizing that their symptoms stem from this specific joint. The sacroiliac joint is easy to miss because it’s located deep in the pelvis, and pain from this area can feel like it’s coming from many different places.
If you’re experiencing lower back pain, buttock pain, leg pain, or a combination of these symptoms, sacroiliac joint dysfunction could be the culprit. This guide explains what the sacroiliac joint is, why it causes pain, how to identify it, and most importantly, how physiotherapy can provide lasting relief.
What Is the Sacroiliac Joint?
The sacroiliac joint is where your sacrum (the base of your spine) connects to your ilium (part of your pelvis). You have two sacroiliac joints—one on each side of your lower spine. These joints are small but incredibly important; they transfer force from your upper body to your lower body and help stabilize your pelvis during movement.
The sacroiliac joints are designed to have minimal movement—they’re stiff, stable joints, not freely mobile ones. This stability is critical for proper force transfer and load management. When the sacroiliac joints become either too mobile (hypermobile) or too stiff (hypomobile), dysfunction and pain result.
Common Causes of Sacroiliac Joint Pain
Understanding what causes SIJ pain is the first step toward addressing it effectively.
1. Muscle Imbalances and Weakness
The sacroiliac joint relies on surrounding muscles—particularly the gluteus medius, piriformis, and deep core muscles—to maintain stability. When these muscles are weak or imbalanced, the joint becomes unstable, leading to excessive movement and pain.
Common causes of muscle weakness include:
- Sedentary lifestyle or prolonged sitting
- Lack of regular strength training
- Improper exercise technique
- Reduced activity following an injury
2. Postural Dysfunction
Poor posture creates abnormal stress patterns at the sacroiliac joint. Forward pelvic tilt, backward pelvic tilt, and lateral pelvic shift all create compensatory stress at the SIJ. Many people with desk jobs develop SIJ pain due to prolonged sitting and poor ergonomic positioning.
3. Biomechanical Issues
Anatomical or movement-related factors can predispose you to SIJ pain:
- Leg length discrepancy (one leg longer than the other)
- Hip tightness or restricted mobility
- Knee or ankle dysfunction that affects how force travels up the leg
- Asymmetrical movement patterns
4. Pregnancy and Postpartum
Pregnancy dramatically increases SIJ pain risk. The hormone relaxin softens ligaments throughout the body, including those stabilizing the sacroiliac joint. The added weight of pregnancy further stresses the joint. Many women experience SIJ pain during pregnancy and postpartum.
5. Direct Trauma or Injury
Falls, motor vehicle accidents, or direct impacts to the pelvis or sacroiliac region can damage the joint or surrounding structures, leading to pain and dysfunction.
6. Repetitive Activities
Sports and occupations involving repetitive twisting, bending, or unilateral loading (weight primarily on one side) can stress the sacroiliac joint excessively. Runners, golfers, and certain laborers are at higher risk.
7. Inflammatory Conditions
Conditions like ankylosing spondylitis and other autoimmune disorders can cause sacroiliac joint inflammation and pain.
8. Hypermobility and Ligament Laxity
Some people naturally have laxer (more flexible) ligaments, making their sacroiliac joints inherently more mobile than is optimal. This creates instability and pain with certain movements.
Symptoms of Sacroiliac Joint Pain
SIJ pain presents differently for different people, which is why it’s often misdiagnosed. Common symptoms include:
Lower Back Pain: Pain typically felt on one side of the lower back, often described as a sharp or stabbing sensation. The pain may be localized directly over the sacroiliac joint or more diffuse across the lower back.
Buttock Pain: Pain in the buttock region on the affected side. This is sometimes mistaken for piriformis syndrome or referred pain from the hip.
Leg Pain: Pain, numbness, or tingling that travels down one leg. Many people assume this is sciatica (nerve pain), but it can be referred pain from the sacroiliac joint.
Hip and Groin Pain: SIJ dysfunction can refer pain to the hip and inner groin region.
Stiffness: Difficulty moving first thing in the morning or after periods of inactivity. Stiffness typically improves with movement as you warm up.
Instability Sensation: A feeling that your pelvis or lower back is “unstable” or “shifting.” Some people describe it as their pelvis or leg “giving way.”
Pain with Specific Activities: Pain that worsens with:
- Climbing stairs
- Walking, especially uphill
- Running
- Jumping
- One-legged standing
- Bending to one side
- Lying on the affected side
- Getting in and out of a car
- Rolling over in bed
Asymmetrical Pain: Pain typically occurs on one side, distinguishing it from central lower back pain.
How SIJ Pain Is Diagnosed?
Diagnosis typically involves:
Clinical Evaluation: Your physiotherapist will perform special tests designed to stress the sacroiliac joint and reproduce your symptoms. These tests assess joint mobility (too much or too little movement), stability, and pain provocation.
Movement Assessment: Observing how you walk, bend, and move helps identify compensatory patterns and biomechanical dysfunction.
Postural Analysis: Assessing your standing posture and pelvic alignment reveals postural factors contributing to SIJ stress.
Palpation: Your physiotherapist will palpate (feel) the sacroiliac joint and surrounding structures to identify areas of tenderness or dysfunction.
Imaging: While X-rays and MRI are sometimes ordered, they’re often not necessary for diagnosis. Clinical assessment is usually sufficient, though imaging can rule out other conditions.
Biomechanical Assessment: A thorough biomechanical assessment can identify movement dysfunctions, muscle imbalances, and structural factors contributing to your SIJ pain. This helps your physiotherapist create a targeted treatment plan addressing root causes, not just symptoms.
Physiotherapy Treatment for Sacroiliac Joint Pain
Physiotherapy is highly effective for sacroiliac joint pain. Treatment typically follows a progressive approach addressing the root causes of your dysfunction.
Phase 1: Pain Management and Mobility (Weeks 1-4)
Goals: Reduce pain, improve mobility, and establish baseline strength.
Interventions:
- Education about your condition and activity modification strategies
- Manual therapy (joint mobilization, soft tissue release) to improve mobility and reduce pain
- Gentle range-of-motion exercises
- Initial core activation exercises
- Postural correction and awareness training
- Potentially SIJ bracing or taping to improve stability during healing
- Ice or heat therapy as appropriate
Phase 2: Stabilization and Strengthening (Weeks 5-12)
Goals: Restore muscular stability to the sacroiliac joint and improve movement patterns.
Interventions:
- Progressive core strengthening, focusing on deep stabilizers
- Gluteal strengthening (particularly gluteus medius and maximus)
- Hip strengthening and mobility work
- Pelvic stability training
- Progressive functional exercises
- Movement pattern retraining to eliminate compensations
- Addressing muscle imbalances
This phase is typically where most functional improvement occurs. Strength and conditioning work is particularly valuable during this phase, providing progressive resistance training that builds the muscular endurance and stability needed for pain-free function.
Phase 3: Return to Function (Weeks 12+)
Goals: Return to normal activities, sports, and fitness without limitation.
Interventions:
- Sport-specific or activity-specific training
- Progressive cardiovascular conditioning
- Return to running or high-impact activities (if applicable)
- Optimization of movement patterns during sports or occupational tasks
- Maintenance programs to prevent recurrence
Address Underlying Biomechanical Factors
Successful long-term management often requires addressing underlying biomechanical issues that created the SIJ dysfunction in the first place. This might include:
Postural Correction: Learning to maintain neutral pelvis alignment during daily activities prevents ongoing SIJ stress.
Movement Pattern Retraining: Correcting how you bend, walk, climb stairs, and perform other daily movements eliminates abnormal joint stresses.
Flexibility and Mobility Work: Addressing tight hip muscles, hamstrings, or lower back muscles that restrict proper movement and create compensatory SIJ stress.
Ergonomic Optimization: If your SIJ pain is work-related, ergonomic advice can help optimize your workspace and positioning to reduce ongoing stress on the joint.
A comprehensive biomechanical assessment can identify these underlying factors so your physiotherapist can address them systematically.
Managing Sacroiliac Joint Pain at Home
Between physiotherapy sessions, self-management is critical:
Activity Modification: Avoid or modify activities that provoke pain. As pain improves, gradually increase activity within your pain tolerance.
Core Exercises: Perform your prescribed exercises consistently—even 15 minutes daily is more effective than sporadic longer sessions.
Proper Posture: Maintain neutral pelvic alignment during sitting, standing, and movement. Be conscious of your posture throughout the day.
Postural Support: Using an SIJ belt or brace during activity can provide mechanical support and reduce pain.
Heat Therapy: Warm compresses or a warm bath can relieve pain and stiffness.
Avoid Prolonged Sitting: If your pain worsens with sitting, break up sitting time with frequent position changes and movement.
Sleep Position: Sleep on your unaffected side with a pillow between your knees to maintain neutral pelvic alignment and reduce stress on the joint.
Weight Management: Excess body weight increases stress on the sacroiliac joint; maintaining a healthy weight reduces joint loading.
When to Seek Professional Help?
You should seek physiotherapy if you’re experiencing:
- Lower back, buttock, or leg pain lasting more than 2-3 weeks
- Pain with specific movements like climbing stairs or walking
- Instability sensations or a “giving way” feeling
- Pain that’s not responding to self-care or over-the-counter medication
- Symptoms suggesting your pain may be SIJ-related rather than general back pain
Early intervention significantly improves outcomes. Orthopaedic physiotherapy specialists are trained to diagnose SIJ dysfunction accurately and provide effective treatment. For chronic pain that hasn’t responded to initial treatment, chronic pain management programs can provide additional strategies and support.
Prevention of Sacroiliac Joint Pain
Once you’ve experienced SIJ pain, preventing recurrence is important:
Maintain Strength: Continue regular strengthening exercises that maintain core and gluteal strength.
Stay Active: Regular physical activity maintains the muscle conditioning that protects the joint.
Practice Good Posture: Habitual postural awareness prevents abnormal joint stresses.
Address Biomechanical Issues: If your pain was caused by muscle imbalances or movement dysfunction, continue addressing these factors.
Manage Weight: Maintaining a healthy weight reduces joint loading.
Avoid Prolonged Immobility: Sedentary periods increase stiffness and dysfunction; frequent movement is protective.
Gradual Return to Activities: When returning to sports or activities after SIJ pain, progress gradually to avoid reinjury.
Conclusion
Sacroiliac joint pain is a treatable condition that responds very well to physiotherapy. By understanding the causes of your pain and engaging in targeted rehabilitation addressing both symptoms and underlying dysfunction, you can eliminate SIJ pain and return to your normal activities.
At Worli Physiotherapy, our specialists have extensive experience diagnosing and treating sacroiliac joint dysfunction. We combine manual therapy, targeted exercise prescription, and biomechanical assessment to address the root causes of your pain, not just the symptoms. Whether you’re experiencing acute SIJ pain or chronic dysfunction, we can help you recover and prevent recurrence. Contact us today to schedule your assessment and begin your journey toward pain-free movement.
