Lower back pain can have many sources, but one commonly overlooked cause is the sacroiliac (SI) joint. If you’re experiencing pain in the lower back, buttocks, or upper legs, the SI joint may be the culprit. At [Synergy Spine and Pain Center], we specialize in identifying and treating SI joint dysfunction to help patients find lasting relief and get back to doing what they love.

The sacroiliac joints are located at the base of the spine, where the sacrum (the triangular bone at the bottom of your spine) connects with the iliac bones (pelvic bones). These joints play a critical role in transferring weight between your upper body and legs and provide stability during movement.

SI joint pain, also called sacroiliitis or SI joint dysfunction, can result from several factors, including:

• Injury or trauma (such as a fall or car accident)
• Pregnancy and childbirth* (due to ligament stretching and pelvic changes)
• Arthritis (especially osteoarthritis or ankylosing spondylitis)
• Repetitive stress from activities like running or heavy lifting
• Post-surgical changes, such as after a lumbar fusion

SI joint pain often mimics other lower back or hip conditions, making it challenging to diagnose without proper evaluation. Symptoms may include:

• Pain in the lower back, buttocks, hips, or groin
• Pain that worsens when sitting, standing, or climbing stairs
• Stiffness or reduced range of motion in the lower back
• Leg instability or a feeling that the leg may “give out”