If your lower back pain spreads into your hips or buttocks, the problem might not actually be your spine—it could be your sacroiliac (SI) joints.
These small but powerful joints connect your spine to your pelvis, and when they’re irritated or out of balance, they can cause pain that feels frustratingly hard to pinpoint.
Ultimately, the SI joints play a vital role in your body’s movement and stability. They act as shock absorbers, helping transfer weight smoothly between your upper body and legs. When they’re working properly, you won’t notice them at all—but when that balance is disrupted, even simple actions like standing, walking, or sitting can become painful.
So, why does this pain happen in the first place? Here are the top reasons!
Pregnancy and Postpartum Changes
During pregnancy, your body releases hormones like relaxin that loosen ligaments throughout your body, preparing your pelvis for childbirth. While this increased flexibility serves an important purpose, it can destabilize the SI joints, causing them to move more than they should. This excessive movement often leads to inflammation and pain that may begin during pregnancy and persist long after delivery.
The weight gain and shifted center of gravity during pregnancy place additional stress on the SI joints. As your belly grows, your posture changes to accommodate the extra weight, often creating an exaggerated curve in your lower back that alters how forces transfer through your pelvis. These biomechanical changes can strain the SI joints beyond their normal capacity.
Even after childbirth, SI joint problems may continue or develop. The ligaments stretched during pregnancy don’t always return to their pre-pregnancy state, leaving the joints with less support than before. Additionally, the physical demands of caring for a newborn—carrying, feeding, and soothing—can perpetuate SI joint dysfunction if the underlying instability hasn’t been addressed.
Leg Length Discrepancy
When one leg is shorter than the other, even by just a quarter of an inch, it creates an uneven foundation that affects your entire skeletal system. This imbalance forces your pelvis to tilt, placing asymmetric stress on your SI joints with every step you take. Over time, this uneven loading can cause one or both SI joints to become inflamed and painful.
Leg length differences can be structural, meaning the bones in one leg are actually shorter, or functional, resulting from muscle imbalances, joint restrictions, or pelvic misalignment.
But here’s the kicker: the longer a leg length discrepancy goes unaddressed, the more your body adapts through compensatory patterns that can lock in SI joint dysfunction.
Your body might hike one hip, rotate your pelvis, or develop scoliotic curves in your spine to level your eyes and maintain balance. These adaptations, while helping you function in the short term, perpetuate the abnormal stress on your SI joints.
Traumatic Injury
A sudden impact or jarring force can damage the SI joint’s supporting ligaments, leading to instability and chronic pain. Common traumatic events include:
- Falling directly onto your buttocks
- Motor vehicle accidents where your foot forcefully hits the brake pedal
- Missing a step and landing hard on one leg
These incidents can ultimately stretch or tear the strong ligaments that normally limit SI joint movement.
Additionally, the effects of trauma might not appear immediately. Sometimes, the initial injury creates subtle instability that gradually worsens over weeks or months as you continue your normal activities. What starts as mild discomfort can progress to significant pain as the joint becomes increasingly unstable and inflamed.
Degenerative Changes
As you age, the cartilage within your SI joints naturally begins to wear down, similar to what occurs in other joints throughout your body. This degeneration can lead to bone-on-bone contact, inflammation, and the development of bone spurs around the joint margins.
Unlike the smooth, gliding movement of healthy joints, degenerative SI joints may catch, grind, or lock during movement.
For instance, arthritis in the SI joints often develops slowly over decades, with symptoms gradually worsening over time. The pain typically starts as morning stiffness that improves with movement, eventually progressing to more constant discomfort that limits your activities.
Previous injuries, repetitive stress, or inflammatory conditions can also accelerate this degenerative process.
Find Relief for Your SI Joint Pain Today!
Identifying the underlying cause of your SI joint pain allows for targeted treatment that addresses the root problem rather than just managing symptoms. If you’re experiencing lower back, hip, or buttock pain that hasn’t responded to conventional treatments, your SI joints might be the problem, and your Bessemer chiropractor is ready to help!
At Premier Chiropractic Center, our team can help you get back to feeling your best. Book your appointment with us today.
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