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Videos de Conceptos Relacionados

Plastic Deformations01:19

Plastic Deformations

439
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...
439
Plastic Deformations01:14

Plastic Deformations

412
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...
412
Temperature Dependent Deformation01:12

Temperature Dependent Deformation

373
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...
373
Deformations in a Symmetric Member in Bending01:18

Deformations in a Symmetric Member in Bending

482
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...
482
Deformation of Member under Multiple Loadings01:11

Deformation of Member under Multiple Loadings

453
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...
453
Deformation in a Circular Shaft01:10

Deformation in a Circular Shaft

877
One of the distinctive characteristics of circular shafts is their ability to maintain their cross-sectional integrity under torsion. In other words, each cross-section continues to exist as a flat, unaltered entity, simply rotating like a solid, rigid slab. To understand the distribution of shearing stress within such a shaft, consider a cylindrical section inside this circular shaft. This section has a length of L and a radius of R, with one end fixed. The radius of the cylindrical section is...
877

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Video Experimental Relacionado

Updated: Jan 22, 2026

Spinal Cord Lateral Hemisection and Asymmetric Behavioral Assessments in Adult Rats
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Deformidad de la columna en adultos

Bassel G Diebo1, Neil V Shah1, Oheneba Boachie-Adjei2

  • 1Department of Orthopaedic Surgery and Rehabilitation Medicine, State University of New York, Downstate Medical Center, New York, NY, USA.

Lancet (London, England)
|July 16, 2019
PubMed
Resumen

La deformidad espinal adulta, común en adultos mayores, incluye la escoliosis iatrogénica y degenerativa. Si bien la atención no quirúrgica es primaria, los resultados quirúrgicos son favorables, aunque persisten las disparidades mundiales en la atención.

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Área de la Ciencia:

  • Ortopedia y Cirugía de la Columna
  • Medicina para la edad avanzada
  • Radiología

Sus antecedentes:

  • La deformidad espinal en adultos afecta a la columna torácica o toracolumbar, especialmente en personas mayores de 65 años.
  • Las causas comunes incluyen flatback iatrogénico y escoliosis degenerativa, con un creciente interés en la atención médica debido al aumento de la prevalencia.
  • Las deformidades espinales de la adolescencia pueden persistir en la edad adulta.

Objetivo del estudio:

  • Revisar la evolución de los datos y los conocimientos sobre la deformidad espinal en adultos en las últimas décadas.
  • Para resaltar las estrategias actuales de evaluación y tratamiento de la deformidad espinal en adultos.
  • Abordar las disparidades mundiales en la evaluación y el tratamiento de la deformidad espinal en adultos.

Principales métodos:

  • Examen físico centrado en la marcha y la postura.
  • Evaluación radiográfica integrada con índices de estratificación del riesgo.
  • Revisión de la evidencia y el conocimiento sobre la deformidad espinal en adultos durante varias décadas.

Principales resultados:

  • El tratamiento no quirúrgico es el enfoque inicial, pero las intervenciones quirúrgicas producen resultados favorables.
  • La prevalencia es alta en la población de más de 65 años.
  • Existen importantes disparidades mundiales en los enfoques de evaluación y tratamiento.

Conclusiones:

  • La deformidad espinal en adultos es una preocupación creciente, especialmente en la población de edad avanzada.
  • Una combinación de evaluación clínica e imágenes es crucial para la planificación del tratamiento.
  • Se justifica una mayor investigación sobre las disparidades mundiales en la atención sanitaria para la deformidad espinal en adultos.