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Related Concept Videos

Method of Joints: Problem Solving I01:30

Method of Joints: Problem Solving I

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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,...
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Consider a truss structure with frictionless joints fixed to a wall and roller support. If a force of 150 N is applied to joint A, the forces in each member of the truss can be determined using the method of joints.
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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.
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Understanding the scalar formulation of the moment of a force and applying it correctly through problem-solving is crucial in designing and analyzing mechanical systems. Here are the steps for problem-solving with the moment of a force:
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Bones of the Lower Limb: Femur and Patella01:16

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The femur is the body's longest and strongest bone spanning the thigh region. Its head articulates with the acetabulum of the hip bone to form the hip joint. A minor indentation on the medial side of the femoral head, called the fovea capitis, serves as the site of attachment for the ligament of the head of the femur. This weak ligament spans the femur and acetabulum and supports the hip joint. The narrowed region below the head is the neck of the femur. The inclination angle between the...
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Related Experiment Video

Updated: Aug 14, 2025

Addressing Practical Issues in Atomic Force Microscopy-Based Micro-Indentation on Human Articular Cartilage Explants
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The stiff proximal interphalangeal joint - an unsolved problem?

Martin Richter1

  • 1Department of Hand Surgery, Helios-Klinikum Bonn/Rhein-Sieg, Germany.

The Journal of Hand Surgery, European Volume
|January 13, 2023
PubMed
Summary

Proximal interphalangeal joint stiffness can impair hand function. Understanding its causes is key to surgical strategies, though complete restoration remains a challenge in hand surgery.

Keywords:
Joint contracturearthrolysisproximal interphalangeal jointtenolysis

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Area of Science:

  • Hand surgery
  • Orthopedic surgery
  • Anatomy

Background:

  • The proximal interphalangeal (PIP) joint is crucial for hand function.
  • Anatomical complexities of the PIP joint frequently lead to stiffness due to structural damage.
  • PIP joint stiffness significantly impacts hand function and daily activities.

Purpose of the Study:

  • To emphasize the importance of accurate assessment and understanding of PIP joint stiffness pathogenesis.
  • To highlight the need for tailored surgical strategies based on the underlying causes of stiffness.
  • To acknowledge that complete restoration of PIP joint function after injury remains an unsolved problem in hand surgery.

Main Methods:

  • Review of anatomical structures and pathogenetic mechanisms of PIP joint stiffness.
  • Analysis of surgical strategies for addressing PIP joint stiffness.
  • Evaluation of outcomes and limitations in restoring pre-injury range of motion.

Main Results:

  • PIP joint stiffness is a common complication following injury, affecting hand function.
  • Accurate diagnosis of the specific damaged structures and pathogenetic pathways is essential for effective treatment.
  • Current surgical approaches may not always achieve full restoration of joint mobility.

Conclusions:

  • Understanding the pathogenesis of PIP joint stiffness is critical for optimizing surgical interventions.
  • Tailoring surgical strategies to the specific injury is necessary for improving outcomes.
  • Restoring pre-injury function in severe cases of PIP joint stiffness remains a significant challenge in hand surgery.