Sorry AWAQ, but your statement is WRONG.
X-rays, MRI's are a tool used to diagnose a patient's medical problem whether it is a spine problem or anything else.
Without knowing if there is an underlying medical condition existing, knowing how the body works does no good.
A doctor can understand how the body works quite well, but without added tools such as x-rays, MRI's CT scans, used when needed, that understanding of how the body works is useless.
Depending on the circumstances and the patient's symptoms, further tests are needed for a proper diagnosis.
Nothing is medicine is cut and dried, but, you are trying to make it out to be such and stating blanket statements that mean nothing.
Fran