权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Measurement of instantaneous center of rotation and its application to the analysis of joint motion

瞬时旋转中心测量及其在关节运动分析中的应用

基本信息

批准号：
63550301
负责人：
ISHIDA Akimasa
金额：
$ 1.47万
依托单位：
Tokyo Medical and Dental University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1988
资助国家：
日本
起止时间：
1988 至 1989
项目状态：
已结题

项目摘要

1 Development of an algorithm for ICR calculation The instantaneous center of rotation (ICR) can be calculated using following quantities : position of one point on a moving segment and angle of the segment. So far only quantities at two consecutive times were used to calculate ICR. Therefore ICR data have been less reliable. In this investigation, we proposed new algorithm for ICR calculation based on smoothing technique. That is, to determine velocity and angular velocity of a segment, we adopted numerical low-pass differentiation. Then we analyzed error of this method and discussed optimal sampling interval of position data. We compared this method with other methods by computer simulation and verified high accuracy of our method.2 ICR measurement system We made an ICR measurement system composed of a position sensor and a personal computer. The error of this system was within +3mm.3 Application to the tempolomandibular joint motion We applied this measurement system to temporomandibular joint motion. Loci of ICR at habitual opening and closing were measured. These loci were located under the condyle. According to the relationship between location of ICR and sliding at joint surface, it is shown that sliding is inevitable at the tempolomandibular joint. Moment arms of masticatory muscles around the ICR increased as two times of those around a fixed point, the condyle.

1 ICR 计算算法的开发瞬时旋转中心 (ICR) 可以使用以下量来计算：移动段上一点的位置和段的角度。到目前为止，仅使用连续两次的数量来计算 ICR。因此 ICR 数据不太可靠。在这项研究中，我们提出了基于平滑技术的 ICR 计算新算法。也就是说，为了确定线段的速度和角速度，我们采用数值低通微分。然后分析了该方法的误差并讨论了位置数据的最佳采样间隔。我们通过计算机模拟将该方法与其他方法进行了比较，验证了该方法的高精度。2 ICR测量系统我们制作了一个由位置传感器和个人计算机组成的ICR测量系统。该系统的误差在±3mm以内。3在颞下颌关节运动中的应用我们将该测量系统应用于颞下颌关节运动。测量了习惯性打开和关闭时 ICR 的位点。这些位点位于髁突下方。根据ICR位置与关节面滑动的关系，表明颞下颌关节滑动是不可避免的。 ICR 周围咀嚼肌的力矩臂增加了固定点（髁突）周围咀嚼肌力矩臂的两倍。