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Related Concept Videos

Three-Dimensional Force System:Problem Solving01:30

Three-Dimensional Force System:Problem Solving

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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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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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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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Design Example: Resistive Touchscreen01:14

Design Example: Resistive Touchscreen

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A device engineer plays a crucial role in designing user interfaces for mobile devices. One such interface is the resistive touchscreen, which fundamentally consists of two metallic layers: a flexible upper layer and a rigid lower layer, separated by a narrow gap. The high resistance between these two layers is a key characteristic of this design.
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When an object's velocity changes over time, the total distance traveled can be determined by summing small displacement intervals over short increments. This approach approximates the true distance through numerical summation and the use of integral calculus. An estimate of the total displacement can be obtained by measuring velocity at regular intervals and multiplying each value by the corresponding time step.If a runner accelerates over the first three seconds of a race, speed measurements...
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Related Experiment Video

Updated: May 2, 2026

A Structured Rehabilitation Protocol for Improved Multifunctional Prosthetic Control: A Case Study
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A Structured Rehabilitation Protocol for Improved Multifunctional Prosthetic Control: A Case Study

Published on: November 6, 2015

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Computer-simulated TOUCH prosthesis cup malposition and solutions.

Kevin Knappe1, Mareike Schonhoff2, Sebastian Jaeger2

  • 1Department of Orthopaedics, Heidelberg University Hospital, Heidelberg, Germany.

Hand Surgery & Rehabilitation
|May 3, 2024
PubMed
Summary
This summary is machine-generated.

Revision of total joint replacement cups for trapeziometacarpal osteoarthritis is critical. Computer simulations show that using a size 10 conical cup, potentially with bone grafting, offers the best revision option for misplaced or tilted cups.

Keywords:
Arthroplasty of the basal joint of the thumbCMC 1 prosthesisEndoprosthetic joint replacement, computer aided designFirst carpometacarpal joint arthritisHand osteoarthritisIntraoperative cup revisionTrapeziometacarpal joint arthritisTrapeziometacarpal osteoarthritisTrapeziometacarpal prosthesis

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Area of Science:

  • Orthopedic Surgery
  • Biomedical Engineering
  • Implant Design

Background:

  • Total joint replacement is increasingly common for advanced trapeziometacarpal joint osteoarthritis.
  • Dual-mobility prostheses offer good short-to-medium term functional results.
  • Correct cup placement is vital for stability and preventing dislocation.

Purpose of the Study:

  • To simulate and analyze intraoperative revision options for misaligned total joint replacement cups.
  • To determine the best cup type and size for revision based on defect area and bone contact.

Main Methods:

  • Computer-aided design (CAD) models of existing spherical and conical cups (sizes 9mm and 10mm) were utilized.
  • Simulations analyzed revision outcomes for tilted or misplaced cups.
  • Defect area and bony contact area were key metrics for evaluating revision strategies.

Main Results:

  • A size 9 conical cup could be replaced by a size 9 spherical cup if well-centered.
  • A size 9 spherical cup required a size 10 cup for revision.
  • For tilted or misplaced size 9 cups, a size 10 conical cup, sometimes with bone grafting, provided the largest bony contact area.

Conclusions:

  • Computer simulations provide guidance for intraoperative cup revision in total joint replacement.
  • Revision strategies depend on cup size, shape, and type of misalignment.
  • Further validation with anatomic specimens is recommended before clinical application.