圣关节运动阻力的实验性表征
Ryota Toyohara1, Niels Hammer2,3,4, Toshiro Ohashi1
1Faculty of Engineering, Hokkaido University, Sapporo, Japan.
Bio-medical materials and engineering
|August 7, 2023
概括
圣关节 (SIJ) 的关节表面形态抵抗运动,特别是在下部方向. 这种设计支持双脚行走,但 misalignment 可能会增加潜风险.
科学领域:
- 生物力学 生物力学
- 整形外科 整形外科 整形外科
- 人类解剖学 人类解剖学
背景情况:
- 人的关节 (SIJ) 在双脚移动时承受着相当大的压力.
- 它的突前有不规则的特点,可能会阻碍关节的运动.
- 了解SIJ机制对于解决相关的疼痛和功能障碍至关重要.
研究的目的:
- 调查SIJ关节表面拓对在生理负荷下运动阻力的影响.
- 确定关节对齐如何影响剪切阻力和重新定位能力.
主要方法:
- 从患者的CT数据创建SIJ表面的3D打印模型.
- 定制的实验设置测量了多个方向和位置的剪切阻力.
- 在卸载剪切力后评估了重置性.
主要成果:
- SIJ的剪切阻力与施加力的方向有显著的变化.
- 下面的方向表现出最高的剪切阻力.
- 关节表面对齐极大地影响了抵抗力和关节行为.
结论:
- 在SIJ的关节表面形态似乎优化为直立双脚行走.
- 偏离最佳对齐可能会增加SIJ外置的风险.
- 进一步研究SIJ生物力学可以为SIJ疼痛的治疗提供信息.
相关概念视频
01:05Static and Kinetic Frictional Force
One of the simpler characteristics of sliding friction is that it is parallel to the contact surfaces between systems, and is always in a direction that opposes the motion or attempted motion of the systems relative to each other. If two systems are in contact and moving relative to one another, then the friction between them is called kinetic friction. For example, kinetic friction slows a hockey puck sliding on ice.
However, if two systems are in contact and are stationary relative to one...
However, if two systems are in contact and are stationary relative to one...
00:57Power Expended by a Constant Force
The relationship between work done and the time taken to do it can be explained using the concept of power. For example, several sprinters in a race may have the same velocity when they reach the finish line, therefore doing the same amount of work, but the winner does it in the least amount of time. Thus, power is defined as the rate of doing work. Since work can vary as a function of time, the average power is defined as the work done during a time interval, divided by the time interval.