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相关概念视频

Functional Classification of Joints01:09

Functional Classification of Joints

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Functional Classification of Joints
The functional classification of joints is determined by the amount of mobility between the adjacent bones. Joints are functionally classified as a synarthrosis or immobile joint, an amphiarthrosis or slightly moveable joint, or as a diarthrosis, a freely moveable joint. Fibrous and cartilaginous joints can be functionally classified as either synarthroses  or amphiarthroses, whereas all synovial joints are classified as diarthroses.
Synarthrosis
An...
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Structural Classification of Joints01:20

Structural Classification of Joints

4.4K
Joints, also known as articulations, are classified based on their structural characteristics, i.e., based on whether the articulating surfaces of the adjacent bones are directly connected by fibrous connective tissue or cartilage, or whether the articulating surfaces contact each other within a fluid-filled joint cavity. These differences serve to divide the joints of the body into three structural classifications.
A fibrous joint is where the adjacent bones are united by fibrous connective...
4.4K
Classification of Bones01:18

Classification of Bones

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The bones of the human skeletal system are of varied shapes, sizes, and functions. They can be classified based on their shape and function into four major classes: long bones, short bones, flat bones, and irregular bones. Some classifications include a fifth type, the sesamoid bones, as a separate class, whereas others categorize them under short bones.
Long and Short Bones
The appendicular skeleton, particularly the upper and lower limbs, is primarily made of long and short bones. The...
7.4K
Relative Motion Analysis using Rotating Axes01:25

Relative Motion Analysis using Rotating Axes

549
Consider a component AB undergoing a linear motion. Along with a linear motion, point B also rotates around point A. To comprehend this complex movement, position vectors for both points A and B are established using a stationary reference frame.
However, to express the relative position of point B relative to point A, an additional frame of reference, denoted as x'y', is necessary. This additional frame not only translates but also rotates relative to the fixed frame, making it...
549
Relative Motion Analysis using Rotating Axes-Problem Solving01:29

Relative Motion Analysis using Rotating Axes-Problem Solving

453
Consider a crane whose telescopic boom rotates with an angular velocity of 0.04 rad/s and angular acceleration of 0.02 rad/s2. Along with the rotation, the boom also extends linearly with a uniform speed of 5 m/s. The extension of the boom is measured at point D, which is measured with respect to the fixed point C on the other end of the boom. For the given instant, the distance between points C and D is 60 meters.
Here, in order to determine the magnitude of velocity and acceleration for point...
453
Eccentric Axial Loading in a Plane of Symmetry01:16

Eccentric Axial Loading in a Plane of Symmetry

299
Eccentric axial loading occurs when an axial load is applied away from the centroidal axis of a structural member. This scenario is common in engineering, where structural elements may not be directly aligned due to various design or functional requirements.
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相关实验视频

Updated: Sep 18, 2025

Biomechanical Changes Related to Low Back Pain: An Innovative Tool for Movement Pattern Assessment and Treatment Evaluation in Rehabilitation
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T4-L1-Hip轴对象化了使用连续测量的Roussouly分类.

Jeffrey Hills1, Camilo Molina2, Lawrence G Lenke3

  • 1University of Texas Health Science Center at San Antonio, San Antonio, Texas.

The Journal of bone and joint surgery. American volume
|June 25, 2025
PubMed
概括

连续的脊椎-骨盆角为脊柱对齐提供了一个比Roussouly分类更精确的方法. 这种方法可以提高手术规划的准确性,以实现腰对齐.

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In Vivo Quantification of Hip Arthrokinematics during Dynamic Weight-bearing Activities using Dual Fluoroscopy
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In Vivo Quantification of Hip Arthrokinematics during Dynamic Weight-bearing Activities using Dual Fluoroscopy
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科学领域:

  • 脊柱外科手术 脊柱外科手术
  • 放射性分析 放射性分析
  • 生物机械分析分析

背景情况:

  • 罗斯苏利分类对脊柱对齐进行了分类,但可能会限制脊柱外科手术中的精准医学.
  • 脊椎 - 骨盆角提供了连续的斜对齐测量,避免了错误分类的风险.

研究的目的:

  • 评估脊椎 - 骨盆角的实用性,以评估斜腰脊柱对齐.
  • 将连续测量的精度与Roussouly分类进行比较.

主要方法:

  • 对320名无症状成年人进行横截面研究,并进行全脊椎放射.
  • 收集的参数:盆腔发病率 (PI),交叉斜率,腰部,L1-盆腔角 (L1PA) 和T4-盆腔角 (T4PA).
  • 根据Roussouly类型分类的棘;使用后勤回归评估角度和Roussouly类型之间的关联.

主要成果:

  • 在Roussouly类型中,L1PA与PI有很强的相关性.
  • 使用PI,L1PA和T4PA的后勤回归模型准确估计了Roussouly类型 (精度为0.82,加权 κ为0.84).
  • 连续的脊椎 - 盆腔角度显示出对脊柱类型的强烈一致性和歧视.

结论:

  • T4-L1-Hip轴与Roussouly分类保持一致,但使用连续测量来提高精度.
  • 使用T4-L1-Hip轴的手术调整规划提供了比Roussouly分类更好的准确性和精度.