Kurzfassung

Spinal testing devices need a tool for calibration and comparison of accomplished studies. For this purpose the human spine is insufficient because of its morphologic and functional variety. The objective of this study was the development of a test body which simulates the functional spinal motion unit and provides a standard calibration.
The test body consist of aluminium mouldings simulating the vertebral bodies, rubber bumps simulating the intervertebral discs and cylindrical guide elements...Spinal testing devices need a tool for calibration and comparison of accomplished studies. For this purpose the human spine is insufficient because of its morphologic and functional variety. The objective of this study was the development of a test body which simulates the functional spinal motion unit and provides a standard calibration.
The test body consist of aluminium mouldings simulating the vertebral bodies, rubber bumps simulating the intervertebral discs and cylindrical guide elements with ball joints simulating the vertebral joints. The test body was tested multidirectional with a moment of 7.5 Nm and follower loads up to 800N.
The results showed similar load-deformation curves of the test body compared to a human lumbar cadaver spine. The follower load had no infIuence during extension-flexion, but an increasing follower load during lateral bending and rotation caused a decrease of ROM. The ROM during lateral bending and rotation is higher than the ROM of the human cadaver spine.
A test body before and after each testing is essential to control the measured values and to produce reliable, high-quality and laboratory-independent results. A general test body could improve the comparability of cadaver studies performed with different spinal testing devices.
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