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Related Concept Videos

Temperature Dependent Deformation01:12

Temperature Dependent Deformation

In a nonhomogeneous rod made up of steel and brass, restrained at both ends and subjected to a temperature change, several steps are involved in calculating the stress and compressive load. Due to the problem's static indeterminacy, one end support is disconnected, allowing the rod to experience the temperature change freely. Next, an unknown force is applied at the free end, triggering deformations in the rod's steel and brass portions. These deformations are then calculated and added together...
Deformation of Member under Multiple Loadings01:11

Deformation of Member under Multiple Loadings

When a rod is made of different materials or has various cross-sections, it must be divided into parts that meet the necessary conditions for determining the deformation. These parts are each characterized by their internal force, cross-sectional area, length, and modulus of elasticity. These parameters are then used to compute the deformation of the entire rod.
In the case of a member with a variable cross-section, the strain is not constant but depends on the position. The deformation of an...
Plastic Deformation in Circular Shafts01:20

Plastic Deformation in Circular Shafts

When materials are subjected to forces that surpass their yield strength, they undergo a process known as plastic deformation. This results in a permanent alteration or strain in their structure. This concept can be specifically applied to circular shafts, where the deformation leads to a change in its shape. The precise evaluation of this plastic deformation requires understanding the stress distribution within the circular shaft, which is achieved by calculating the maximum shearing stress in...
Deformations in a Symmetric Member in Bending01:18

Deformations in a Symmetric Member in Bending

When analyzing the deformation of a symmetric prismatic member subjected to bending by equal and opposite couples, it becomes clear that as the member bends, the originally straight lines on its wider faces curve into circular arcs, with a constant radius centered at a point known as Point C. This phenomenon helps to understand the stress and strain distribution within the member more clearly.
When the member is segmented into tiny cubic elements, it is observed that the primary stress...
Plastic Deformations01:19

Plastic Deformations

Plastic deformation represents a fundamental concept in materials science, which explains the irreversible change in the shape of a material when it experiences stress beyond its elastic capability. This phenomenon is important in structural engineering, especially in designing and analyzing cantilever beams—structures that are securely fixed at one end and bear loads at the opposite end. When these beams are subjected to loads within their elastic range, they will return to their original...
Plastic Deformations01:14

Plastic Deformations

It is essential to understand how structural members behave under plastic deformation when the bending stress exceeds the material's yield strength. This state of deformation permanently alters the shape of the member, in contrast to the linear elastic behavior observed before yielding. The strain at any point in the member is expressed in terms of maximum strain. Notably, the neutral axis, which coincides with the centroid during elastic bending, shifts away from the centroid under plastic...

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Related Experiment Video

Updated: May 28, 2026

Micro/Nano-scale Strain Distribution Measurement from Sampling Moiré Fringes
06:56

Micro/Nano-scale Strain Distribution Measurement from Sampling Moiré Fringes

Published on: May 23, 2017

Quantifying the Erlenmeyer flask deformity.

A Carter1, P S Rajan, P Deegan

  • 1Department of Radiology, Addenbrooke's Hospital, University of Cambridge, Cambridge, UK. andrewcarter@yahoo.com.au

The British Journal of Radiology
|October 20, 2011
PubMed
Summary
This summary is machine-generated.

A new quantitative measurement for Erlenmeyer flask deformity in Gaucher's disease has been developed. This simple ratio on knee radiographs reliably identifies the bone modelling abnormality, aiding diagnosis and research.

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Area of Science:

  • Orthopedic radiology
  • Medical imaging analysis
  • Skeletal dysplasias

Background:

  • Erlenmeyer flask deformity is a common radiological finding in Gaucher's disease.
  • A standardized definition and reliable prevalence data for this deformity are lacking.
  • Subjective radiological assessment leads to variable interpretations.

Purpose of the Study:

  • To develop an easily applicable and objective definition for Erlenmeyer flask deformity.
  • To establish a quantitative method for identifying this specific bone modelling abnormality.

Main Methods:

  • Analysis of knee radiographs from patients with confirmed Gaucher's disease.
  • Measurement of femoral shaft diameter at specific intervals relative to the physeal scar.
  • Development of a quantitative ratio to define Erlenmeyer flask morphology.

Main Results:

  • A ratio > 0.57 (femoral shaft diameter 4 cm from physis to physeal baseline diameter) predicted Erlenmeyer flask deformity.
  • This ratio demonstrated 95.6% sensitivity and 100% specificity in the study cohort.
  • The method was reproducible and simple to apply to distal femur radiographs.

Conclusions:

  • A robust, quantitative measurement provides an objective definition for Erlenmeyer flask deformity.
  • This standardized method facilitates comparative studies and research into Gaucher's disease pathogenesis.
  • The quantitative approach overcomes limitations of subjective radiological interpretation.