Kemper Andrew R, McNally Craig, Duma Steffany M
Virginia Tech-Wake Forest Center for Injury Biomechanics, Blackburg, VA.
Biomed Sci Instrum. 2009;45:12-7.
The purpose of this study was to determine if the removal of the periosteum or the application of a strain gage has any significant effect on the structural response of human ribs. A total of 32 three-point bending tests were performed on 16 matched whole rib sections obtained from the left and right sides of five male human thoraces. For one test group, matched specimens were tested to determine the effect of removing the soft tissue and periosteum versus leaving it intact. For a second test group, matched specimens were tested to determine the effects of placing a strain gage on the tension side of the specimen versus no strain gage attachment. The specimens were tested using a servo-hydraulic material testing machine (MTS) at a displacement rate of 17.78 cm/s with a fixed testing span of 10.16 cm. Prior to testing, a microCT was used to obtain a detailed cross-sectional image of each specimen at the point of the impactor blade contact. There were no statistical differences in area moment of inertia (p=0.60), distance to the neutral axis (p=0.29), peak moment (p=0.14), peak impactor displacement (p=0.13), estimated peak stress (p=0.42), or estimated peak strain (p=0.15) between specimens with the periosteum and those without the periosteum. There were no statistical differences in area moment of inertia (p=0.76), distance to the neutral axis (p=0.20), peak moment (p=0.81), peak impactor displacement (p=0.91), estimated peak stress (p=0.59), or estimated peak strain (p=0.29) between specimens with a strain gage and those without a strain gage. In summary, neither the removal of the periosteum nor the application of a strain gage has any significant effect on the structural response of human ribs in dynamic three-point bending.
本研究的目的是确定去除骨膜或应用应变片是否会对人肋骨的结构响应产生任何显著影响。对从五名男性人类胸廓左右两侧获取的16对匹配的完整肋骨节段进行了总共32次三点弯曲试验。对于一个试验组，对匹配的标本进行测试，以确定去除软组织和骨膜与保持其完整的效果。对于第二个试验组，对匹配的标本进行测试，以确定在标本的受拉侧放置应变片与不粘贴应变片的效果。使用伺服液压材料试验机（MTS）以17.78 cm/s的位移速率和10.16 cm的固定测试跨度对标本进行测试。在测试之前，使用微型计算机断层扫描（microCT）在冲击器刀片接触点获取每个标本的详细横截面图像。有骨膜的标本和无骨膜的标本在惯性矩面积（p = 0.60）、到中性轴的距离（p = 0.29）、峰值弯矩（p = 0.14）、峰值冲击器位移（p = 0.13）、估计峰值应力（p = 0.42）或估计峰值应变（p = 0.15）方面没有统计学差异。有应变片的标本和无应变片的标本在惯性矩面积（p = 0.76）、到中性轴的距离（p = 0.20）、峰值弯矩（p = 0.81）、峰值冲击器位移（p = 0.91）、估计峰值应力（p = 0.59）或估计峰值应变（p = 0.29）方面没有统计学差异。总之，去除骨膜或应用应变片对人肋骨在动态三点弯曲中的结构响应均无显著影响。
