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首页> 外文期刊>Journal of Biomechanics >Damage evolution in acetabular reconstructs under physiological testing in a saline environment
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Damage evolution in acetabular reconstructs under physiological testing in a saline environment

机译：生理环境下生理盐水下髋臼重建物的损伤演变

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Damage development in cemented acetabular reconstructs has been studied under a combined cyclic loading block representative of routine activities in a saline environment. A custom-made environmental chamber was designed and installed on the Portsmouth hip simulator to allow testing of acetabular reconstructs in a wet condition for the first time. Damage was monitored and detected by scanning at selected loading intervals using micro-focus computed tomography (μCT). The preliminary results show that, although, as in dry cases, debonding at the bone-cement interface defined the failure of the cement fixation, the combination of mechanical loading and saline environment significantly affected the damage initiation and development, with drastically reduced survival lives of the reconstructs. Debonding was found to be initiated at the bone-cement interface near the rim of the acetabular cup, or DeLee zone I, in wet condition, as opposed to initiation in DeLee zone II near the dome region in dry cases. The survival time of the reconstruct in wet condition is less than 10% of that in dry condition under a given applied hip contact force.
机译：在联合循环载荷块下，研究了在胶合髋臼重建物中的损伤发展，该载荷代表了在盐环境中的常规活动。设计了一个定制的环境舱，并将其安装在朴茨茅斯的髋部模拟器上，以便首次在潮湿条件下测试髋臼重建体。通过使用微焦点计算机断层扫描（μCT）在选定的加载间隔进行扫描来监控和检测损坏。初步结果表明，尽管在干燥情况下，骨水泥界面处的脱粘定义了水泥固定的失败，但机械载荷和盐环境的结合显着影响了损伤的发生和发展，大大降低了患者的生存期。重建。发现在潮湿条件下，脱粘是在髋臼杯边缘或DeLee I区附近的骨水泥界面处开始的，而在干燥情况下，是在圆顶区域附近的DeLee II区中开始的。在给定的髋部接触力下，在潮湿条件下重建体的存活时间少于干燥条件下的存活时间的10％。

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