collage_object

geometric Diameter

The Geometric diameter - a factor stiffening the thoracic cavity - increased prestress
If well designed, the application of forces to a tensegrity structure will deform it into a slightly different shape in a way that supports the applied forces. Knowing the action of global tension-compression vectors within the thorax cavity, makes it much easier to restore sagittal balance. The thoracic cavity is defined by a CTR unit circle with the diameter of two units, reaching from T1 to T10, with origin at T5.  A change in  C7-T5 mobility proportions will influence the y- and x-axis, respectively. The circle will change and become elliptical.

 Diameters - Tension type

Dorso-ventral = x-axis  shorter
Cranio- caudal = y-axis longer
Elliptical along y-axis

TENSION TYPE ELLIPTICAL ALONG THE Y-AXIS.
SEGMENTAL MOBILITY RELATED TO THE TENSION TYPE.

Negative Poisson's ratio
Our analysis of  relationship between mobility and structure suggests an arrangement  within the thoracic cavity, having a negative Poisson's ratio. When loaded, the structures become thicker perpendicular to the applied force. Such arrangement is expected to have mechanical properties such as high energy absorption and resistance. In this case securing blood circulation through the aortic arc.

Diameters Compression type 

Dorso-ventral = x-axis longer
Cranio-caudal = y-axis shorter
Elliptical along x-axis

COMPRESSION TYPE ELLIPTICAL ALONG THE X-AXIS.
SEGMENTAL MOBILITY RELATED TO THE COMPRESSION TYPE.