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Related Concept Videos

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
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Method of Joints: Problem Solving I01:30

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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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Method of Joints: Problem Solving II01:30

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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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Development of the Limb Synovial Joints01:07

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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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Structural Classification of Joints01:20

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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.
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A three-dimensional force system refers to a scenario in which three forces act simultaneously in three different directions. This type of problem is commonly encountered in physics and engineering, where it is necessary to calculate the resultant force on the system, which can then be used to predict or analyze the behavior of the object or structure under consideration.
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Estimation of Contact Regions Between Hands and Objects During Human Multi-Digit Grasping
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Three-dimensional finger joint angles by hand posture and object properties.

Kyung-Sun Lee1, Myung-Chul Jung2

  • 1a Department of Industrial Safety Management , Suncheon Jeil College , Suncheon , Republic of Korea.

Ergonomics
|October 17, 2015
PubMed
Summary
This summary is machine-generated.

This study identified 3D finger joint angles during object manipulation. Hand posture and object size significantly influenced joint angles, crucial for understanding ergonomics and hand health.

Keywords:
Pinchinggraspingobject shapeobject sizeobject weight

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Area of Science:

  • Biomechanics
  • Human Factors Engineering
  • Ergonomics

Background:

  • Three-dimensional finger joint angles are critical for understanding hand function in ergonomics.
  • Knowledge of these angles is important for designing handheld devices and preventing musculoskeletal hand disorders.

Purpose of the Study:

  • To determine three-dimensional finger joint angles for various hand postures.
  • To investigate the influence of object properties (size, shape, weight) on finger joint angles.

Main Methods:

  • Utilized a VICON motion capture system to measure finger joint angles in 10 participants.
  • Participants performed pinching and grasping tasks with objects of varying sizes, shapes, and weights.

Main Results:

  • Hand posture and object size were the most significant factors affecting joint flexion angles.
  • Object shape had a limited effect, primarily on the metacarpophalangeal (MCP) joints of the index and little fingers.
  • Larger flexion angles were observed during five-finger grasps, and joint angles increased linearly with decreasing object size.

Conclusions:

  • Provides fundamental data on thumb and finger joint angles during object interaction.
  • Offers insights applicable to the design of ergonomic tools and the prevention of hand injuries.