| All forms engineered by either nature or man for movement are designed with a pattern specific for the movement intended and its required work performance. Knees may bend but may not rotate, as wheels will rotate but should not bend.
Balance is an important factor which must be included in the design to give maximum efficiency to performance. An eccentric wheel will not roll smoothly and a knee which allows lateral movement is an invitation for ultimate disaster.
In addition to balance, concentricity of design and relativity in structural placement are imperative. A curvature of the spine which dislocates the pelvis will place the legs eccentric to the body and reduce ambulatory efficiency. A bent axle will develop erratic rolling conditions even if the wheel itself is perfectly round.
Improper tooth placement, be it natural or artificial will by damaging the relativity of the structure of the jaw, reduce the potential of the whole articular composite and its associated areas. It can be simply stated that any significant deviation from the physiological norm in the number, size and arrangement of teeth will impair the gnathostomatic system.
| 
