The need of data on the behaviour of the lumbar spine during the loading of the pelvis using an inflatable seat led to the necessity of the lumbar vertebrae to be instrumented. For the configuration of the test consisting of a seated human subject, the posterior instrumentation was not possible. Thus, the instrumentation technique applied consisted of the installation of boxes including the sensors (angular speed, accelerometers) on the anterior part of the vertebra body of L2, L3, and L5.

This paper deals with the following subjects:​ principle of the instrumentation of the lumbar spine, dissection and instrumentation of the vertebrae, checking of the position of the sensors boxes in comparison to the spine axes using X-rays, and 3D articulated arm recording of the initial position of the sensors when the subject is positioned.

In conclusion, the technique of instrumentation allowed measurement data to be acquired and curves characterizing the behaviour of the lumbar spine according to level of the instrumented vertebrae to be plotted.