Take a very fresh red onion and pull off all the “flaky” outside dry skin to leave you with a shiny smooth red surface.
Now, slice off the top of the onion [ slice off quite a bit ] so that the top is flat.
Now, do the same thing to the bottom of the onion.
You want to be left with a fairly “flat” onion.
Now, carefully scoop out the centre of the onion. Scoop out a circular chunk.
You should now be left with a hollow onion, flat at the top and bottom, and with a hole in the middle.
This is similar to the ANNULUS FIBROSIS.
In reality, you wouldn’t be able to see the hole like this, as there would be some layers of the “onion” on the top and bottom.
We had to cut the top and bottom off so that you could see the hole.
The NUCLEUS PULPOSUS sits in this hole.
Now take the onion and feel it with your fingers.
If the onion is nice and moist, you should be able to bend the rings of the onion a little.
Do you feel that it has some flexibility in it ?
This is how a healthy disk should be. The rings should be able to flex as the NUCLEUS PULPOSUS pushes against it.
Why is the NUCLEUS PULPOSUS squeezing against it ? Because it is reacting to forces applied to it [ e.g. you are lifting a box, or bending over to pick something up ].
Now, leave the onion for about two weeks or so in a very dry area, and come back and look at the onion.
Feel the onion again. Try to bend the rings.
What happens ? The rings are not as flexible as before, in fact if it has dried out enough, the rings can break and tear.
This can happen with a disk and is called a disk tear.
Basically the mechanical properties [ flexibility and strength etc ] of the disk have changed [ become worse ].
Why ? because fluid [ mainly water ] has escaped from the disk.
Now, in our bodies, major temperature changes are rare, so what can cause the disk to loose water ?
The answer is pressure.
But I have said previously that our backs are designed to withstand large amounts of pressure.
That is true, but only with a back that still has the shape that God intended it to be.
So what could cause it to change shape ?
I’ll be answering that question and many others soon
It is extremely important, and is the basis of why I think and will prove that muscular imbalances/ sacro-iliac joint dysfunctions are the ROOT cause of the vast majority of sciatic back pain.