A spine deformity occurs when your spine varies by more than 10 degrees from ‘healthy’ curvature. But, what does this mean exactly?
Contrary to popular belief, your spine isn’t 100% straight and vertical. The spinal shape has curvatures, but the end result is that it is vertical! Our spine consists of a series of gentle arcs. Our lumbar spine, or lower back, swoops slightly to the back, and our thoracic spine, or upper back, bends subtly forward. The backward curve of your lower back is known as lordosis and the forward stoop that runs between our shoulder blades is known as kyphosis. Lordosis and kyphosis are spinal curvature deformities. Both are abnormal curvatures of the spine.
But, when viewed head-on, our backbone should look like a straight pillar. Hence, it is also called the ‘vertebral column’.
Moreover, the curves and straight stretches of your spine make symmetry possible. Your head sits directly over your pelvis because the lordosis of your lower back and the kyphosis of your upper spine balance each other out. If one of these curves becomes greater or lesser than the other, then problems can occur. We refer to this as sagittal imbalance, because the head and pelvis no longer fall within the same, or sagittal, plane.
Too much swaying backwards can be thought of as ‘lordosis’, and too much forward stooping in the upper back is ‘kyphosis’.
Likewise, when the spine tilts away from the midline of the body, doctors refer to this problem as coronal imbalance or scoliosis. Unevenness in the ‘coronal’ plane (the view from head-on) causes asymmetry in the trunk of the body. This can include uneven hips and shoulders or one-sided bulging of the ribs.