The plumb line of the spine is the line from the first vertebra (ear) to the sacrum (hip). It shows the best alignment for the function and strength of the spine.
The plumb line also measures the front and back spinal curvature, three curvature systems, each having 30 degrees of curves, determining spine strength.
Any change to the degree of angles of the spine will change its position from the plumb line and, in turn, changes the pressure, strength, stability and function of the spine, and if not corrected, can lead to early degeneration and more significant risk to mechanical inflammation and injury.
Let us see an example of this.
A sacral dysfunction commonly causes an acute exaggerated curve to the lumbar spine, predisposing people to disc injuries and degenerative disease.
To offload the pressure on the sacrum due to pain, the body leans back, putting significant pressure on the lower back.
In the attempt to go back to the plumb line for spinal strength and visual balance, the head glides forward to the midline and causes other problems.
Another example is:
A facet joint dysfunction/inflammation can cause a reduction in the curvature of the lower spine (straightening of the spine).
This, in turn, causes your head to go forward, increasing pain and pressure on the lower back.
In the attempt of the body to correct its posture, pressure points develop in other areas and lead to dysfunction and pain.
Your body instinctively thrives on returning to the plumbline, sacrificing visual acuity and balance for pain and discomfort.
The most destructive process is when your head has moved in front of the plumb line.
For every 1 cm head in front past the plumb line, there is a further 2 kg of pressure onto your spine.
