Your Back Hurts — But Is It Really Your Back?
You feel a deep, aching pain low in your back, off to one side.
The pain gets worse when you stand up from sitting or roll over in bed.
Sometimes it shoots into your buttock or down the back of your thigh.
Sitting for long meetings at your Vancouver office makes everything much worse.
You've tried lumbar back belts, but nothing seems to help the pain.
This might not be your back at all — it could be your sacroiliac joint.
⚠️ This guide is educational, not medical advice. Always consult your physician or physiotherapist for accurate diagnosis and treatment.
Where Is Your Sacroiliac Joint?
Your sacroiliac joint (SI joint) sits at the bottom of your spine.
Anatomy in plain terms:
- Your spine ends at the sacrum, a triangular bone at the base.
- The sacrum meets your pelvis at two joints, one on each side.
- These are the sacroiliac joints, connecting spine to pelvis.
- The joints allow only tiny movements — they're not designed for flexibility.
- Strong ligaments hold them together during walking and daily movement.
How to find your SI joints:
- Feel the bony bumps just below your waistline in the back.
- Trace down about 2 inches from those bumps.
- You'll find small dimples on either side of the tailbone area.
- Your SI joints sit right under those dimples in the lower back.
Signs Your Pain Is Actually SI Joint
Classic SI joint pain signs:
- Location — pain low in the back, off to one side of the spine.
- Rarely both sides — usually one SI joint at a time.
- Deep, aching quality — not sharp or burning like nerve pain.
- Standing up worsens it — transitioning from sit to stand hurts.
- Rolling over in bed hurts — nighttime movements cause sharp pain.
- Uneven surfaces bother you — walking on stairs is painful.
- Sitting cross-legged hurts — figure-4 positions reproduce the pain.
- Radiates to the buttock — pain travels into the glute area.
- May go down the leg — sometimes reaches the back of the thigh.
How SI joint pain differs from lumbar pain:
- Lumbar pain sits in the middle of the lower back.
- SI joint pain sits to one side below the belt line.
- Lumbar disc pain often radiates below the knee.
- SI joint pain rarely goes below the knee.
- Lumbar pain worsens with bending forward.
- SI joint pain worsens with weight shifting side-to-side.
What Causes SI Joint Pain
Cause 1: SI Joint Dysfunction
- The joint moves too much (hypermobile) or too little (hypomobile).
- Both cause pain and inflammation around the joint.
- Common after pregnancy, falls, or motor vehicle accidents.
Cause 2: Postpartum Pelvic Instability
- Pregnancy hormones relax pelvic ligaments to allow birth.
- Ligaments don't always return to normal tightness after delivery.
- SI joint pain persists for weeks or months after childbirth.
Cause 3: Pregnancy (Especially Third Trimester)
- Growing baby increases pressure on the pelvis and SI joints.
- Relaxin hormone loosens SI joint ligaments during pregnancy.
- Pain typically worsens in the second and third trimesters.
Cause 4: SI Joint Arthritis
- Aging causes cartilage wear at the SI joint surfaces.
- Chronic inflammation develops over years or decades.
- Common in Vancouver seniors and adults over 50.
Cause 5: Ankylosing Spondylitis
- Inflammatory condition affecting the SI joints often first.
- Progresses to affect the entire spine over time.
- Requires rheumatology evaluation and specific medical management.
Cause 6: Trauma or Injury
- Falls onto the buttock or hip damage SI joint ligaments.
- Motor vehicle accidents commonly injure the SI joint.
- Sports injuries during running, cycling, or contact sports.
Cause 7: Leg Length Discrepancy
- One leg shorter than the other stresses the SI joint on the longer side.
- Chronic uneven weight bearing causes chronic SI joint pain.
Cause 8: Repetitive Lifting or Twisting
- Occupational strain from lifting patients, boxes, or heavy loads.
- Vancouver nurses, warehouse workers, and construction workers common patients.
How SI Belts Work
The mechanism:
- The belt wraps around the pelvis at the level of the SI joints.
- Compression pushes the joint surfaces together like a natural ligament.
- Stability increases during walking, standing, and daily activities.
- Reduced joint movement allows inflamed tissues to heal properly.
- Muscle guarding around the joint relaxes with external support.
What SI belts accomplish:
- Reduce pain during weight-bearing activities.
- Increase stability for the pelvis and lower back.
- Support healing by limiting excessive joint movement.
- Improve function — walking, standing, and daily activities.
- Complement physiotherapy by supporting the joint during rehab.
- Bridge to recovery for postpartum women and injury patients.
SI belts are narrow — they sit right at the SI joint level, not around the entire lower back.
Introducing the Medi Lumbamed Sacro
Key features:
- Narrow profile — sits precisely at the SI joint level for targeted support.
- Adjustable compression — hook-and-loop closure allows customized tension.
- Breathable fabric — comfortable for all-day wear under clothing.
- Anatomical fit — designed to match the natural curve of the pelvis.
- Low profile — invisible under most clothing throughout the day.
- German engineering — medi is a leader in medical compression garments.
Best for:
- Sacroiliac joint dysfunction with acute or chronic pain.
- Postpartum pelvic pain and SI joint recovery periods.
- Pregnancy-related pelvic pain in the second and third trimesters.
- SI joint arthritis causing daily activity limitations.
- Post-trauma SI joint sprains requiring support during healing.
- Athletes returning to activity after SI joint injuries.
How the Lumbamed Sacro compares to generic SI belts:
- Medical-grade construction with clinical-quality materials.
- Recommended by Vancouver physiotherapists and orthopedic specialists.
- Longer-lasting than budget SI belts sold in general pharmacies.
- Precise sizing options for optimal therapeutic effect.
When to Use an SI Belt
Scenario 1: New Diagnosis of SI Joint Dysfunction
- Physiotherapist confirms SI joint as the pain source.
- Wear the SI belt during all weight-bearing activities.
- Combine with physiotherapy exercises for best results.
Scenario 2: Postpartum Pelvic Pain
- Pelvic pain persists 6-12 weeks after childbirth.
- Wear the SI belt during standing and walking activities.
- Continue for 6-12 weeks or until symptoms resolve completely.
Scenario 3: Pregnancy Pelvic Girdle Pain
- Second or third trimester pelvic pain limits daily activity.
- Wear the SI belt during walking and standing periods.
- Confirm safe use with your obstetrician or midwife first.
Scenario 4: Chronic SI Joint Arthritis
- Long-term SI joint pain from arthritic changes.
- Wear the SI belt during activities that trigger pain.
- Combine with anti-inflammatory management and exercise.
Scenario 5: Post-Injury Recovery
- Recent fall or accident causing SI joint sprain.
- Wear the SI belt during initial healing phase.
- Gradually reduce use as pain and stability improve.
Scenario 6: Athletic Return to Activity
- Runner or hiker recovering from SI joint injury.
- Wear the SI belt during exercise for stability.
- Progressively reduce as strength and coordination return.
When NOT to Use an SI Belt
- Pain not from SI joint — lumbar disc issues need different treatment.
- Severe fracture or unstable pelvis — requires medical stabilization instead.
- Skin problems at the belt area — wait for skin healing first.
- Circulation problems — compression may worsen circulation issues.
- Very early pregnancy — first trimester compression not recommended usually.
- Cognitive impairment — patients who can't manage the belt safely.
- Improper diagnosis — confirm SI joint pain before purchase.
How to Wear an SI Belt Correctly
Correct positioning:
- Position the belt below the waistline — not at the waist.
- The belt should sit at the level of the SI joint dimples.
- The top edge should sit at the base of the buttocks.
- Compression should feel snug but not painful during wear.
Common positioning errors:
- Too high — belt sits at the lumbar spine, not the SI joint.
- Too low — belt sits on the buttocks, providing no SI support.
- Too tight — restricts breathing and causes discomfort.
- Too loose — provides no therapeutic compression to the joint.
Daily wear schedule:
- Wear during standing, walking, and activities that trigger pain.
- Remove during rest, sleeping, and prolonged sitting.
- Total wear time typically 4-8 hours daily during pain periods.
- Progressive weaning as symptoms improve over weeks.
Sizing at Yaletown
How SI belts are sized:
- Measure around the pelvis at the level of the SI joint dimples.
- Below the belt line — around the widest part of the hips.
- Measure with normal clothing on for accurate everyday sizing.
- Bring a tape measure to Yaletown for professional fitting help.
Common Medi Lumbamed Sacro sizes:
- Size 1 — smaller pelvis measurements.
- Size 2 — medium pelvis measurements.
- Size 3 — larger pelvis measurements.
- Size 4 — extra-large pelvis measurements.
- Bariatric sizing available on special order.
We are open 7 days a week at 1255 Pacific Boulevard, Vancouver, BC for fittings.
Complementary Treatments
Physiotherapy exercises:
- Core strengthening reduces SI joint stress during activity.
- Glute strengthening supports the pelvis during movement.
- Manual therapy addresses joint stiffness and muscle tightness.
Movement patterns:
- Avoid crossing legs while sitting for prolonged periods.
- Sleep with a pillow between the knees during side-lying.
- Get up from sitting slowly and evenly, not favoring one side.
Lifestyle modifications:
- Weight loss reduces pelvic strain in overweight patients.
- Ergonomic seating at work supports proper pelvic position.
- Regular walking maintains general pelvic health.
Medical management:
- Anti-inflammatory medications provide short-term pain relief.
- Physiotherapist referral for structured rehabilitation program.
- SI joint injections for severe or persistent pain cases.
When to See a Doctor
- Numbness or weakness in the legs or feet.
- Bladder or bowel changes — urgent medical concern.
- Fever with back pain — possible infection requiring urgent care.
- Unexplained weight loss with new back pain.
- No improvement after 4 weeks of consistent SI belt use.
- Progressive worsening despite proper treatment.
- History of cancer with new back pain.
- Recent significant trauma requires urgent evaluation.
Common Questions
Will BC extended health insurance cover the Medi Lumbamed Sacro?
Many plans cover orthopedic supports with a physician's written prescription documenting need.
How long until an SI belt helps my pain?
Most patients notice pain reduction within 1-2 weeks of consistent use.
Can I wear an SI belt during pregnancy?
Yes — the Medi Lumbamed Sacro works well during the second and third trimesters.
Can I sleep with my SI belt on?
No — remove the SI belt before sleeping to allow natural circulation.
Do I need a prescription to buy an SI belt?
No — Yaletown sells the Medi Lumbamed Sacro without a prescription requirement.
Can I exercise with an SI belt on?
Yes — many patients wear the SI belt during walking and light exercise.
Will the SI belt weaken my core muscles?
Modern SI belts don't significantly weaken core muscles when used properly.
How long should I need to wear an SI belt?
Most SI joint dysfunction patients wear the belt for 6-12 weeks during recovery.
Can men wear the Medi Lumbamed Sacro?
Yes — the Medi Lumbamed Sacro suits both men and women effectively.
What if the SI belt doesn't help my pain?
Return to your physician or physiotherapist for reassessment.
Get Fitted at Yaletown Today
The Medi Lumbamed Sacro provides German-engineered support for lasting comfort.
Visit Yaletown Medical Supplies for professional sizing and expert guidance today.
Call (236) 466-2141 or visit 1255 Pacific Boulevard, Vancouver, BC.
Written by Ozgur Alacaba, Turkish-licensed Pharmacist (2004-2026) and Owner of Yaletown Medical Supplies. Not registered with CPBC.
Yaletown Medical Supplies | 1255 Pacific Boulevard, Vancouver, BC | Open 7 days a week