Hartmann Frank, Gercek Erol, Dietz Sven-Oliver, Hely Hans, Rommens Pol Maria
Department of Trauma Surgery, Center for Musculoskeletal Surgery, Mainz, Germany.
Biomed Tech (Berl). 2011 Apr;56(2):99-105. doi: 10.1515/BMT.2011.004. Epub 2011 Feb 10.
Spinal testing devices need a tool for calibration and comparison of accomplished studies. The objective of this study was the development of a polysegmental test body, which simulates several functional spinal motion units and provides a standard calibration.
The test body consists of aluminum moldings simulating the vertebral bodies, rubber discs 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 800 N.
The results showed sigmoid load-deformation curves of the test body similar to a human lumbar cadaver spine, but with a higher range of motion (ROM). The follower load had no influence during extension-flexion, but an increasing follower load during lateral bending and rotation caused increased friction and restoring forces with a decrea-sed ROM.
The polysegmental test body does not show the same mechanical behavior like a polysegmental human cadaver spine in all directions of motion, but it provides reproducible values without requiring preconditioning as proposed for human specimen.
This test body could improve the comparability of cadaver studies performed with different spinal testing devices by standardization of the test set-ups.
脊柱测试设备需要一种用于校准和比较已完成研究的工具。本研究的目的是开发一种多节段测试体，该测试体可模拟多个功能性脊柱运动单元并提供标准校准。
测试体由模拟椎体的铝制模制件、模拟椎间盘的橡胶盘以及带有模拟椎间关节的球形接头的圆柱形导向元件组成。测试体在7.5 Nm的力矩和高达800 N的跟随载荷下进行多方向测试。
结果显示测试体的S形载荷-变形曲线与人类腰椎尸体脊柱相似，但运动范围（ROM）更大。跟随载荷在屈伸过程中没有影响，但在侧屈和旋转过程中跟随载荷增加会导致摩擦力和恢复力增加，同时ROM减小。
多节段测试体在所有运动方向上并不表现出与多节段人类尸体脊柱相同的力学行为，但它提供了可重复的值，且无需像人类标本那样进行预处理。
该测试体可通过测试设置的标准化提高使用不同脊柱测试设备进行的尸体研究的可比性。
