The lower back is one of the most vulnerable areas of the human body, it is also statistically the leading cause of disability in the UK above any other condition. There are a number of different clinical diagnoses for lower back pain, however it has been proven that the exact diagnosis through MRI may not be the real cause of the pain. The lower back is commonly put under unnecessary strain and tension due to other joints, both above and below, not behaving in the way that they should. If any other joints are compromised in their mobility and/or stability then the lower back will take up a lot of the slack.
If the pelvis has an excessive tilt (anteriorly), the hips will naturally tighten up which will cause the lower back to be forced into a big lordotic curve (arch position) causing compression of the vertebrae.
Due to the pelvis position there will be a lack of movement at the hips, in turn this will put a demand on the lower back to produce more movement. Most likely resulting in degeneration at the spine/disks.
Thoracic Spine Immobility
If there is reduced movement in the mid to upper part of the spine, much like the effect of tension through the hips, the lower back will be forced to produce more movement, breeding instability.