SI joint fusion is a minimally invasive procedure for persistent sacroiliac (SI) joint dysfunction. The SI joints connect your lower spine to your pelvis, and they absorb force from walking and lifting. When one of these joints becomes unstable or inflamed, pain typically appears in specific patterns. These symptoms help you recognize those patterns:
Radiating Discomfort
SI joint pain rarely stays in one spot, and it typically travels to nearby areas. Irritated nerves and tight muscles carry the discomfort outward. Major areas include the following, although the pattern varies from person to person:
- The groin on the affected side
- The outer or back of the thigh
- The hip, which sometimes mimics hip arthritis
- The back of the knee in some cases
This spreading pain resembles sciatica from a herniated disc. Both conditions cause leg discomfort, but their treatments differ. A provider may perform hands-on tests to see if SI joint fusion is right for you.
Increasing Lower Back Pain
Since each SI joint works independently, pain typically begins on only one side. You may feel it just below your waistline, near the dimple above your buttock. The ache starts as mild stiffness, and it grows stronger over weeks or months.
Some people notice pain after a fall, and others feel it during or after pregnancy. Arthritis may also play a role as the joint cartilage wears down with age. A difference in leg length adds uneven stress to one joint. Repetitive activities like running also strain the joint over time.
Certain movements may make one-sided pain worse. If you climb stairs, stand from a chair, or roll over in bed, the pain may spike. Track these triggers for a week, and share your notes with a provider. Pain that steadily increases over several months points toward a joint problem.
Worsening Pain in Buttocks
SI joint dysfunction frequently spreads pain into the buttock on the affected side. Many people mistake this pain for a pulled muscle because the area feels deep and sore. Muscle strains usually improve in a few days, but SI joint pain tends to linger or worsen. The ache may also flare after you stand for long periods.
Sitting on the affected side typically intensifies the ache, especially when you sit on hard surfaces. Some people shift their weight to one hip, and this habit strains nearby muscles. A soft cushion may reduce pressure during long car rides or workdays.
Lying Down for Relief
Many people with SI joint dysfunction feel better when they lie down. Standing loads the joint with body weight, and lying flat removes much of that pressure. Rest eases symptoms temporarily, but it does not correct an unstable joint. Certain positions offer more relief than others:
- On your back with a pillow under your knees
- On your unaffected side with a pillow between your knees
- Off your painful side during sleep
Schedule SI joint fusion
During SI joint fusion, a surgeon places small implants across the joint to limit motion. Doctors typically recommend it after physical therapy, medication, or injections fail to control symptoms. A medical team can review your history and imaging, and they can discuss your treatment options with you. Book a consultation online or call a spine specialist today.
