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This is a lateral shift. A lateral shift of the low back (lumbar spine) joints. It's not a hip, pelvis, SI, or IT band issue. They're not always as obvious as this, so orthopedic clinicians must remove the patient's shirt to see it. It is not observable in lying; the patient must be standing. It is corrected (often painfully) by moving the low back joints in the opposite direction first. Usually that entails side glides against the wall or in free standing, and sometimes I need to assist as the clinician. Once the patient has free movement in both directions side to side, we restore extension and flexion of the low back. These are not that common, but I will typically see a few patients a month with a lateral shift. 
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 Centralization is a very important concept, and is well-documented in many research studies. Problems in the spine often cause pain/numbness/tingling in the extremities (legs, feet, arms, hands) as affected nerves carry symptoms along the distribution of the nerve. Centralization is when symptoms move toward the spine. This is a GOOD thing - even if the spine pain is temporarily more intense (before it goes away for good). By the same token, peripheralization is not a good thing. We don't want pain that is moving farther away from the spine into the periphery (extremities). Keep in mind that centralization also applies when left or right low back pain or left or right neck pain moves to the center of the low back or neck.
Not all patients will experience centralization. Some extremity pain just goes away without moving to the spine first. If you are receiving treatment or are just monitoring or treating yourself, remember to avoid things that peripheralize your symptoms and to perform the activities or movements that centralize your symptoms. When I treat patients with spine or extremity symptoms, I use specific movements to elicit centralization - and prevent peripheralization. If you experience centralization, you know you're on the right track! --Laura  When we bend forwards, the front of the vertebrae come together, moving disc material backwards. When we move backwards, the opposite occurs: the back of the vertebrae move together, pushing disc material forwards. Movement of the nucleus (the inside of the disc) within the annulus (the outer part of the disc) is normal - to an extent. Unfortunately, it is quite common for the nucleus to be pushed outside its normal limits, resulting in injury. This is typically referred to as a disc protrusion, a disc herniation, or a bulging disc. When discs move out of place, in most cases they bulge backwards or backwards and to the side. In rarer instances, the disc will move to the side, forwards, or forwards and to the side.
Why do discs bulge? The imbalance of forces on our discs throughout our lives is largely to blame. Did you know we bend forwards about 4,000 times per day? And about how many times do we bend backwards? I would say rarely, if ever. Considering that sitting in a slouched posture is also bending the spine forwards, we tend to spend a great deal of time with our spines bent forwards. This not only creates a severe imbalance of forces on the disc, it also overstretches all the supports that are designed to keep this from happening. Is it any surprise then that one day the disc will move far enough to hit something it shouldn't and cause symptoms, signaling to the person that there is an injury? This is why many patients do not report a traumatic event that created their back or leg pain. (Or, in the neck, their neck or arm pain.) Generally, the injury was years in the making, and then one day the disc went farther than usual and hit pain-sensitive structures, such as a nerve. Keeping this anatomy and biomechanics in mind, it follows that to fix an injured disc, patients will RARELY need to perform exercises that bend their spines forwards. (Examples include touching your toes, child's pose, downward dog, crunches, single or double knee to chest, or the figure four stretch.) INSTEAD, most patients need exercises that bend their spines backward, such as standing back bends or lying extension exercises such as cobras or upward dog. Ultimately it is my job to diagnose the patient's injury and then choose the SPECIFIC exercise for that patient that allows him/her to get back on track. -- Laura I realize I sound like a broken record, but I can't stress this enough: just because something is identified on an x-ray, MRI, or CT scan, does not mean it is causing a problem! Because so many people WITHOUT symptoms have abnormalities, it's clear we can't use imaging to diagnose orthopedic pathology. Instead, patients need a clinical exam in which the structures of the body are stressed in order to determine what the root of the pain/numbness/tingling/etc. is. This chart has some great statistics! Say you're over 40, for example: there's a 68% chance some of your disks are degenerated, a 45% chance some disks have shrunk in height, a 50% chance some disks are bulging, and a 33% chance some disks are protruded. These spinal changes are therefore quite normal as we age and are not necessarily correlated with symptoms. -- Laura   Ever wonder why so many people have their discs move out of place? There's almost double the amount of pressure going through the discs in the low back with slouched sitting compared to standing - not to mention really slouched sitting. And with the amount of sitting most Americans do, all that force can be a recipe for disaster. -- Laura
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