Objective to evaluate the new designed spinal internal fixator (CYL) with the biomechanical study.

目的作者设计一种新型脊柱内固定器，该生物力学测试对该器械进行评价。

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Objective To evaluate four kinds of spinal internal fixator with the biomechanical study and clinical application.

目的通过生物力学测试和临床应用，对四种脊柱内固定器进行评价。

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