Each person has his own preference in movement or positional preference. This applies to each part of the spinal column, but also any joint in the body has a preference.
The easiest ones to recognize are the left- or right-handedness. But besides the handedness there are many small preference movements that have nothing to do with handedness. 

In a resting position, someone will take his or her preferred position. This person will stand or sit in a certain way; where does he sit down to look at the TV? How is the neck turned, or does he turn the whole body? Does this person lay down on the couch or does he sit upright? During a movement someone will be able to use his strength, speed and coordination at its best in his own preferred movement.

Let it be clear that other typologies can still be performed in a healthy situation!

Under normal circumstances a normal, healthy person can reach all the anatomical and physiological boundaries of the body, but there will always be a preference. If there is pathology, one will notice that the boundaries of the non-preferred typologies have decreased. At that moment there are less possibilities to make movements, with exception of the preferred movement and posture, the preferred typology.

Cartilage, ligaments and muscles adapt to the movement and posture which is most common. It is even possible that these structures made the preferences. The famous chicken-and-egg problem.

At a joint of the spine can be seen how this joint, in comparison with other, operates or has operated. At places where muscles and / or ligaments are / were attached, one can see if there have been a lot of tensile forces. Anatomical changes of cartilage, ligaments and muscles occur with repetitive movements and postures.

Alex Tiemes
Phone: +31 6 42241663
E-mail: aijinmo3dmt@gmail.com
Address: Breemarsweg 219
7553 HJ Hengelo, the Netherlands