There are three forms of abnormal spinal curvatures, each of which has a different cause. The angular curvature consists of a break, a separation of the articular processes between two vertebrae. A curvature known as Pott s disease, caries of the spine, supposed by pathologists to be of tuberculous origin. The curvature which has no knuckle, no sharp break nor vertebral caries, but, an increased curvature in the cervical, dorsal or lumbar, or in both of the latter two, from the vertebrae becoming wedge-shaped. Displaced vertebrae, by impinging or stretching, cause contraction of nerve tissue.
Tension is the condition of being stretched.
Tension, more or less than normal, causes an increase or decrease of vibration, which means a greater or less force of an impulse and a corresponding amount of heat. Nerve contraction increases vibration, irritation and heat. The force of an impulse is augmented by the greater speed in transit. The bounding back of an impulse is known as reflex action. Displaced bones cause pressure upon nerves and consequent tension and deranged function.