Walsh W R, Hamdy R C, Ehrlich M G
Department of Orthopaedics, Rhode Island Hospital, Brown University School of Medicine, Providence.
Clin Orthop Relat Res. 1994 Sep(306):230-8.
Reports on the mechanical and physical properties of lengthened bone after completion of the lengthening process remain scarce. Varied results of torsional testing of lengthened bone have been reported. Furthermore, torsional testing provides information on the shear properties of the tissue but does not reflect the elastic properties obtained from tensile, compressive, or bending tests. The present study evaluated the mechanical properties of lengthened bone at various time points, using a uniaxial tension test. Physical properties (density and ash weight) were determined as well. Results indicate that the tensile properties of the lengthened bone increase with time after the completion of lengthening, but they remain significantly weaker than controls (50%) even after 12 weeks. Density and ash weight measurements also increased with time, correlating with the increase in the tensile mechanical properties.
关于延长过程完成后延长骨的力学和物理特性的报告仍然很少。已有关于延长骨扭转测试的不同结果的报道。此外，扭转测试提供了关于组织剪切特性的信息，但不能反映从拉伸、压缩或弯曲测试中获得的弹性特性。本研究使用单轴拉伸试验评估了延长骨在不同时间点的力学特性。还测定了物理特性（密度和灰重）。结果表明，延长骨的拉伸特性在延长完成后随时间增加，但即使在12周后仍显著弱于对照组（50%）。密度和灰重测量值也随时间增加，与拉伸力学特性的增加相关。
