双流动性是否仍然在较小的杯子尺寸中提供更好的稳定性? 一个计算机建模的稳定性比较与22毫米对比28毫米的内部头在双流动性对比单轴承结构的双流动性
Amit Atrey1, Alessandro Navacchia2, Sarah E Ward1
1St. Michael's Hospital, University of Toronto, Toronto, ON, Canada.
概括
与标准轴承 (SB) 设计相比,双流动性 (DM) 结构显著提高了部植入物的稳定性. 在DM结构中,较小的内部头部尺寸不会影响稳定性,为减少修复手术提供了可行的选择.
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:
- 脱位是关节整形术 (THA) 后修复手术的主要原因.
- 双流动性 (DM) 植入物越来越多地用于减少脱位率.
- 与标准轴承 (SB) 植入物相比,使用较小的杯子中的较小头部的DM植入物的稳定性尚未得到充分理解.
研究的目的:
- 为了比较双流动性 (DM) 结构与标准轴承 (SB) 结构在较小的全关节整形 (THA) 杯中的稳定性.
- 为了评估DM结构中较小的内部头部尺寸 (22-mm vs. 28-mm) 对稳定性的影响.
- 评估植入物设计对运动范围和脱位阻力的影响.
主要方法:
- 计算机建模用于模拟三个主要杯尺寸 (48mm,50mm,52mm) 的稳定性.
- 标准轴承 (SB) 结构使用28mm,32mm和36mm头进行了测试.
- 双流动性 (DM) 构造与22mm和28mm内部头进行了测试,杯子位置,茎偏移和茎尺寸标准化.
主要成果:
- 与所有SB结构相比,DM结构显示出明显更大的跳跃距离 (改善稳定性) (p < 0.001).
- 在22毫米和28毫米的DM内头之间,在运动范围或跳跃距离上没有观察到统计学上显著的差异.
- 在所有测试的杯子尺寸中,DM构造的跳跃距离明显大于SB构造.
结论:
- 双流动性结构提供优越的稳定性比标准轴承结构在模拟的具有挑战性的位置.
- 在DM结构中,内部头的直径似乎不会影响整体植入物稳定性.
- DM植入物显示出增强稳定性的承诺,并可能降低全关节整形术的修订率.
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