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Related Concept Videos

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,...
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...
Method of Sections: Problem Solving I01:27

Method of Sections: Problem Solving I

Consider a symmetrical roof truss structure, composed of vertical, diagonal, and horizontal members. The length of each horizontal member is 4 m. The lengths of the vertical members FB and HD are 4 m, while the length of member GC is 6 m. The loads acting at joints F, G, and H are 2 kN, while those at joints A and E are 1 kN.
Introduction to Structures01:30

Introduction to Structures

A structure is defined as a system of interconnected members designed to support or transfer forces and successfully withstand the loads acting on them. The internal forces of a structure can be determined by decomposing the structure and analyzing the free-body diagrams of the individual members or of a combination of members. This helps in understanding the structural elements' behavior and ensuring that the structure is stable and can withstand the subjected loads.
There are three main...
Method of Joints01:30

Method of Joints

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.
Since plane truss members are in the same plane, each joint is subjected to a coplanar and concurrent force system. To apply the method of joints, the first step is to...
Internal Loadings in Structural Members: Problem Solving01:28

Internal Loadings in Structural Members: Problem Solving

When designing or analyzing a structural member, it is important to consider the internal loadings developed within the member. These internal loadings include normal force, shear force, and bending moment. Engineers can ensure that the structural member can support the applied external forces by calculating these internal loadings.
To illustrate this, let's consider a beam OC of 5 kN, inclined at an angle of 53.13° with the horizontal and supported at both ends. Determine the internal loadings...

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Related Experiment Video

Updated: May 30, 2026

In Vivo Quantification of Hip Arthrokinematics during Dynamic Weight-bearing Activities using Dual Fluoroscopy
07:43

In Vivo Quantification of Hip Arthrokinematics during Dynamic Weight-bearing Activities using Dual Fluoroscopy

Published on: July 2, 2021

[Utility of hip structure analysis].

Junichi Takada1, Kousuke Iba, Toshihiko Yamashita

  • 1Kitago Orthopaedic Clinic.

Nihon Rinsho. Japanese Journal of Clinical Medicine
|July 22, 2011
PubMed
Summary
This summary is machine-generated.

Hip structure analysis reveals age-related changes in femur geometry, independent of bone density. Treatments for osteoporosis significantly improve hip strength more than bone density, suggesting a novel approach to fracture risk reduction.

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Imaging of the Microstructural Failure Mechanism in the Human Hip
08:43

Imaging of the Microstructural Failure Mechanism in the Human Hip

Published on: September 29, 2023

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Last Updated: May 30, 2026

In Vivo Quantification of Hip Arthrokinematics during Dynamic Weight-bearing Activities using Dual Fluoroscopy
07:43

In Vivo Quantification of Hip Arthrokinematics during Dynamic Weight-bearing Activities using Dual Fluoroscopy

Published on: July 2, 2021

Imaging of the Microstructural Failure Mechanism in the Human Hip
08:43

Imaging of the Microstructural Failure Mechanism in the Human Hip

Published on: September 29, 2023

Area of Science:

  • Orthopedics and Bone Health
  • Gerontology
  • Medical Imaging Analysis

Background:

  • Dual-energy X-ray absorptiometry (DXA) enables Hip Structure Analysis (HSA) to assess proximal femur geometry.
  • Understanding age-related geometric changes in the proximal femur is crucial for fracture risk assessment.

Purpose of the Study:

  • To analyze age-related trends in proximal femur geometry using Hip Structure Analysis (HSA) in Japanese women.
  • To investigate the relationship between geometric strength (section modulus) and bone mineral density (BMD) changes.
  • To evaluate the impact of osteoporosis treatments on proximal femur geometry.

Main Methods:

  • Utilized conventional DXA scans for Hip Structure Analysis (HSA) to measure proximal femur geometry.
  • Analyzed cross-sectional geometric parameters, specifically section modulus, at different femur regions (neck, intertrochanter, shaft).
  • Compared geometric changes with bone mineral density (BMD) and assessed treatment effects in osteoporotic women.

Main Results:

  • Section modulus decline at the narrow neck occurred after 50-59 years; at the intertrochanter, it decreased after 70-74 years.
  • Section modulus at the shaft remained stable throughout life, indicating it's an uncommon fracture site.
  • In Japanese women, reduced geometric strength (section modulus) was not solely dependent on decreased BMD.
  • Osteoporotic women treated with risedronate, alendronate, or raloxifene showed significant improvements in proximal femur geometry.
  • The percentage increase in section modulus was greater than the percentage increase in BMD following treatment.

Conclusions:

  • Hip Structure Analysis (HSA) provides insights into age-related geometric changes in the proximal femur, distinct from BMD.
  • Improvements in geometric strength following osteoporosis treatment exceed BMD gains, suggesting a mechanism beyond BMD for fracture risk reduction.
  • These findings highlight the importance of geometric properties in understanding bone strength and fracture prevention.