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Related Concept Videos

Structural Classification of Joints01:20

Structural Classification of Joints

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...
Functional Classification of Joints01:09

Functional Classification of Joints

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 immobile...
Three-Dimensional Analysis of Strain01:29

Three-Dimensional Analysis of Strain

Three-dimensional strain analysis is crucial for understanding how materials deform under stress, particularly in elastic, homogeneous materials. This method employs principal stress axes to simplify complex stress states into more understandable forms. Subjected to stress, a small cubic element within a material either expands or contracts along these axes, transforming into a rectangular parallelepiped. This transformation effectively illustrates the material's deformation. The principal...
Three-Dimensional Force System01:30

Three-Dimensional Force System

In mechanical engineering, a three-dimensional force system is a system of forces acting in three dimensions, with forces applied along the x, y, and z coordinate axes. The three-dimensional force system is an important concept in mechanical engineering, as it allows engineers to understand and analyze the behavior of objects and structures in three dimensions. By understanding the forces acting on a system, engineers can design more efficient and effective mechanical systems that can withstand...
Method of Joints: Problem Solving I01:30

Method of Joints: Problem Solving I

The method of joints is a commonly used technique to analyze the forces in structural trusses. The method is based on the principle of equilibrium, which assumes that the truss members are connected by frictionless pins. The forces at each joint can be determined by considering the equilibrium of the forces acting on that joint. Consider a truss structure with two forces of 20 N and 10 N acting at joints C and D, respectively. The method of joints can be used to determine the forces FCB, FDC,...
Development of the Limb Synovial Joints01:07

Development of the Limb Synovial Joints

Joints form during embryonic development in conjunction with the formation and growth of the associated bones. The embryonic tissue that gives rise to all bones, cartilage, and connective tissues of the body is called mesenchyme.
The mesenchymal stem cells differentiate into chondrocytes that form the hyaline cartilage, and later the cartilaginous model of the bone. This model further transforms into a bone. This process is known as endochondral ossification.
During development, the limbs...

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Four-Dimensional CT Analysis Using Sequential 3D-3D Registration
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Published on: November 23, 2019

Statistical analysis of the three dimensional joint complex.

Thomas M Greiner1, Kevin A Ball

  • 1Department of Health Professions, University of Wisconsin, La Crosse, WI, USA. greiner.thom@uwlax.edu

Computer Methods in Biomechanics and Biomedical Engineering
|November 18, 2008
PubMed
Summary
This summary is machine-generated.

This study introduces the axis triangle technique for analyzing joint rotations using 3D data. This novel multivariate method overcomes limitations of isolated univariate analyses, offering a comprehensive approach to joint function assessment.

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Area of Science:

  • Biomechanics
  • Geometric Morphometrics
  • Statistical Analysis

Background:

  • Three-dimensional data capture is common, but statistical methods for multivariate joint data are underdeveloped.
  • Current methods often use isolated univariate statistics, failing to account for linked joint descriptors.

Purpose of the Study:

  • To propose a new analytical perspective for multivariate joint data.
  • To develop a method that integrates joint axis orientations and motions for comprehensive analysis.

Main Methods:

  • Adapted geometric morphometrics techniques.
  • Converted joint axis orientation and motion data into a 3D 'axis triangle' shape.
  • Applied conventional multivariate statistical analyses to the axis triangle.

Main Results:

  • The axis triangle provides a unified 3D representation of joint rotation data.
  • Multivariate statistical analyses are feasible using this geometric approach.
  • The technique links rotational axis orientations with motion patterns.

Conclusions:

  • The axis triangle technique offers an encompassing method for analyzing joint rotations.
  • This approach represents a significant advance over current univariate methods.
  • It enables a more comprehensive understanding of joint function by considering linked rotational data.