The DIERS formetric 4D analysis system permits rapid static and dynamic (functional) optical measurement of the human back and spine. The procedure is radiation-free and operates without contact. Numerous clinical parameters for objective analysis of body statics, posture, scoliosis, and all forms of spinal deformities can be shown. The new 4D technology leads into functional clinical measurement technology, to increase measurement precision (4D averaging) and to avoid postural variances. The formetric system has been in development for more than 25 years at various universities and institutes in cooperation with our customers. The development began with the objective of reducing the high x-ray load on patients being followed for scoliosis and developing a procedure which offers a replacement for x-rays. Over the years, the application spectrum was greatly expanded. New applications such as control measurements of shoe inlay function or testing equalisation of leg length inequality were developed, and new target groups such as dentists, osteopaths etc. were opened up.?? The 4D technology which was developed in cooperation with leading European universities and is registered for a patent is currently in use in the DIERS formetric 4D and allows functional analysis and locomotion studies of the spine, shoulder, pelvis etc.