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Mel Siff
12-11-1998, 08:38 AM
In a message dated 12/11/98, nvb@hawaiian.net wrote:

Ton, please do not stifle thought on your BioMech list. Is bandwidth that

tight? Is it only in the USA where net time is a basic monthly $20 and you

guys are paying by the minute?



The extremities obviously pale in their importance to awesome structures and

biomechanics of the neuro-spine. Please allow the minds of many to control
the discourse. Private email does not foment knowledge expansion.

***Maybe we could reach a compromise by working strictly within the scope of
biomechanics, namely that discussion is relevant if it concentrates on applied
mechanics and not epidemiological aspects of spinal manipulation.

Discussion could then focus on the correctness of concepts such as non-
pathological subluxations, chronic misalignment of components of the vertebral
complex, relative degrees of deformation of the different soft tissues
involved, hysteresis effects and manipulation, reduction of stress and strain
on the inteverebral discs by manipulation, possible fluid dynamic effects on
the fluidic components of the spinal complex, nerve stretching, theories
about torsion and herniation of discs, claims that use of brief application of
manual loading can mechanically alter collagenous tissue, claims about the
alleged precision of alignment of spinal segements relative to one another,
and so forth.

Possibly the whole issue might be placed in the context of overall spinal
stabilisation and mobilisation, e.g. with regard to modelling the processes of
lifting or the effects of exercise loads on the spine during different
movements. In other words, this would add the dimension of examining the
effects of active loading imposed by exercise versus the passive loading of
the spine imposed by therapeutic manipulation.

The spine still poses many unsolved mysteries and is worthy of further
discussion, but I agree with Ton and others when they express concern that the
discussion at times has tended to veer seriously out of mainstream
biomechanics and even into some unnecessarily personal encounters.

Dr Mel C Siff
Littleton, CO, USA
mcsiff@aol.com

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