SKELETAL TRACKING WITH SKELETAL FIXATION

通过骨骼固定进行骨骼追踪

• 批准号: 6160830
• 负责人: J P HOLDEN
• 金额: --
• 依托单位: NATIONAL INSTITUTE OF ARTHRITIS AND MUSCULOSKELETAL AND SKIN DISEASES
• 依托单位国家: 美国
• 资助国家: 美国
• 起止时间: 至
• 项目状态: 未结题
• 来源: https://reporter.nih.gov/project-details/6160830
• 关键词: biomechanics; biomedical equipment development; body movement; clinical research; diagnosis quality /standard; ergonomics; gait; human subject; joints; knee; leg; limb bone; limb movement; patient monitoring device; skin

The fundamental measurements in gait analysis consist of joint motion and net joint kinetic estimates. The fact that such measurements are referenced to joints implies knowledge of the positions of the skeleton. Data on skeletal position are typically obtained by measuring the locations of targets attached to the surface of the body. Errors in these data are introduced by the movement of the targets relative to the skeleton, due to the combined effect of the target attachment technique and displacements of the skin surface relative to the bone. The magnitude and pattern of these "surface movement errors" in standard gait data remain unknown, due to difficulties in measuring the true skeletal motion. Available data suggest that surface movement errors may be of considerable magnitude. The purpose of this project is to investigate the magnitudes and patterns of the surface movement errors during walking. A principle objective necessary to achieve this goal was to develop and demonstrate a minimally invasive technique for making the measurements. The movement of surface mounted targets (SMT) on a shell at the mid-shank, and of bone mounted targets attached to the distal shank using a Percutaneous Skeletal Tracker (PST), were simultaneously measured during free-speed walking of three adult subjects having different body types. Surface movement errors in shank kinematic estimates were determined by expressing the segmental motion derived from the SMT relative to the PST-based segment coordinate system (SCS) located at the segment center of gravity. The greatest errors were along and around the shank longitudinal axis, with peak magnitudes of 10 mm of translation and 8 degrees of rotation in one subject. Estimates of knee joint center locations differed by less than 11 mm in each SCS direction. Differences in estimates of net knee joint forces and moments were most prominent during stance phase, with magnitudes up to 39 N in the shank mediolateral direction and 9 N.m about the mediolateral axis. The differences in kinetics were primarily related to the effect of segment position and orientation on the expression of joint forces and on the magnitude and expression of joint moments.

步态分析的基本测量包括关节运动和 净关节动力学估计。 事实上，这样的测量是 提及关节意味着了解骨骼的位置。 骨骼位置的数据通常通过测量 附着在身体表面的目标位置。 错误于 这些数据是通过目标相对于目标的运动引入的 骨架，由于目标附着技术的综合作用 以及皮肤表面相对于骨骼的位移。 这 标准步态中这些“表面运动误差”的大小和模式 由于难以测量真实的骨骼，数据仍然未知 运动。 现有数据表明，表面移动误差可能是 相当大的规模。 该项目的目的是调查 期间表面运动误差的大小和模式 步行。 实现这一目标所需的一个主要目标是 开发并展示一种微创技术 测量。 外壳上表面安装目标 (SMT) 的移动 中柄，以及使用连接到远端柄的骨安装目标 经皮骨骼追踪器 (PST)，同时进行测量 在三名身体不同的成年受试者自由步行期间 类型。 小腿运动学估计中的表面运动误差为 通过表达从 SMT 导出的分段运动来确定 相对于位于 段重心。 最大的错误发生在 柄纵轴，平移峰值幅度为 10 毫米 一门学科旋转 8 度。 膝关节中心的估计 每个 SCS 方向上的位置差异小于 11 mm。 差异 在净膝关节力和力矩的估计中最为突出 在站立阶段，小腿内侧的震级高达 39 N 方向和围绕中外侧轴 9 N.m。 差异在于 动力学主要与节段位置和 联合力的表达以及大小和方向的方向 联合矩的表达。