在现代双移动性植入物中,乙体外和内设计对后部水平脱位距离的影响
Nathaniel T Ondeck1, Drake G LeBrun1, Shammodip Roy2
1Adult Reconstruction Joint Replacement Service, Hospital for Special Surgery, New York, NY, USA.
概括
双流动性植入物设计显著影响后部水平脱位距离 (PHDD). 升高的边缘设计 (MDM) 显示出更高的PHDD,与半球设计相比降低了脱位风险.
科学领域:
- 整形外科手术 整形外科手术
- 生物医学工程 生物医学工程
- 植入物设计 植入物设计
背景情况:
- 后侧水平脱距离 (PHDD) 是评估部植入物脱风险的关键3D测量.
- 双流动性 (DM) 结构提供了不同的设计,以提高关节的稳定性.
- 了解影响PHDD的设计因素对于优化植入物性能至关重要.
研究的目的:
- 确定与增加的后侧水平脱位距离 (PHDD) 相关联的双流动性 (DM) 乙状骨杯的特定设计因素.
- 评估和比较三种不同的DM植入物设计的PHDD值:MDM,OR3O和G7.
主要方法:
- 使用计算机辅助设计 (CAD) 虚拟植入三种DM形杯类型 (MDM,OR3O,G7) 进入3DCT衍生骨盆模型.
- 每个设计模拟的多样化的acetabular轮边缘积累和大腿骨头中心定位.
- 计算每种植入物尺寸和设计的有效头径和PHDD值.
主要成果:
- 与半球OR3O和G7设计相比,MDM设计具有正边积累,在所有外大小中显示出明显更高的PHDD值.
- 与MDM类似的产品显示PHDD比OR3O大16.429.0%,比G7.7大15.230.5%.
- 在G7设计中,媒介化的股骨头中心 (OR3O) 的潜在好处被更大的有效头部直径与外直径的比率所抵消,从而导致可比的PHDD值.
结论:
- 乙骨杯的设计参数显然会影响双流动性 (DM) 植入物中的PHDD值.
- 升高的轮设计与PHDD增加有关,可能会提高稳定性.
- 虽然媒介化的股骨头中心可以改善PHDD,但其效果可能会被其他设计因素 (如头径比) 否定.
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