Schmenz wrote:its not so much about realigning - its about neurology and proprioceptive balance. the "pop" doesnt matter so much - hence why low force chiro still works without the cavitation. each speed of adjustment has a different neurological signature. it just so happens that when you get the pop that signature has been shown to have different effects than without the "pop" (which is just a gas bubble anyway).
(sorry for making it non technical but i figure that would be easier to understand than if i start talking about 1a afferents and brain stem function - which i can if youd prefer)
(when i said the tibia could be rotated - i was using layman speak. its more likely that its neutral zone larger or smaller than normal and its instantaneous axis of rotation is not ideal creating aberrant muscle loading and the resultant pain pattern.)
There are pretty much 2 schools of chiro the old and the new. the old talk about bone out of place and that the bone puts pressure on the nerve and the adjustment restores innate. which was great in the 19th century when they didnt have the understanding we have now. the newer school is concerned more with neurological function and midline stability as controlled through the brainstem and follows more the evidence based practice model.
you are correct - with the exception of ribs, bones dont move out of place to the extent that most people imagine or that some practitioners would have you believe.
i will speak for myself now and say that what i look for is resistance to spring on palpation - if a joint feels "jammed" then there is too much gain in the system and it is not functioning correctly neurologically. the adjustment fires a specific neuron which feeds into the brainstem which effectively acts as a reset switch and restores the natural gain to that the joint can move to the extent it was designed to.
that is an over simplified version but i hope it might help to give you a greater understanding. without writing an essay and using examples it gives you the basic idea but is by no means the complete picture.
sorry for the hijack.
Would you please explain what you mean by "proprioceptive balance." Do you mean that there is some problem with proprioception that causes loss of balance? Do you mean that there is an abnormality in the proprioceptors?
What is the neurological signature? Can you point me to reports of the action potentials recorded by electrodes within the nerve cells?
What is the "neutral zone" of the tibia? Is this related to the engineering useage of "neutral zone", which is the part of a beam at which the strain is zero?
What is the "evidence based practice model"? Can you refer to a Cochrane review?
What is the "gain in the system"? What is the amplifier, what is the input, what is the output?