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Related Concept Videos

Line Loss01:10

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The different configurations of source-load connections include wye (star) and delta connections. The relationship between line and phase voltages and currents varies depending on the configuration. When the source is supplying power, it is transmitted through the wires to the load, and during this transmission, some power is absorbed by the wires, leading to line loss.
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Reducing Line Loss01:18

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In a three-phase circuit, line loss is an indicator of energy dissipated as heat due to the resistance of transmission lines. To address this, incorporating transformers into the system—a step-up transformer at the source and a step-down transformer at the load—is a strategic solution. Two three-phase transformers are introduced to improve this.
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Stress analysis under multiple loading conditions is intricate, necessitating a comprehensive grasp of normal and shearing stresses. Consider a small cube at point O, subjected to stress on all six faces, visible or not. Normal stress components σx, σy, σz act perpendicularly to the x, y, and z axes. Shearing stress components τxy and τxz are exerted on faces perpendicular to these axes.
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Language, whether spoken, signed, or written, consists of specific components: lexicon and grammar. The lexicon is the vocabulary of a language, comprising its words. Grammar is the set of rules used to convey meaning through the lexicon. For example, English grammar adds “-ed” to most verbs to indicate past tense. Words are formed by combining phonemes, which are the basic sound units of a language. Different languages have different sets of phonemes (e.g., “ah” vs.
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Periprosthetic acetabular bone loss using a constrained acetabular component.

Hiroshi Ito1, Takeo Matsuno

  • 1Department of Orthopaedic Surgery, Asahikawa Medical College, Midorigaoka Higashi 2-1-1-1, 078-8510, Asahikawa, Japan. itobiro@asahikawa-med.ac.jp

Archives of Orthopaedic and Trauma Surgery
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Summary

Constrained acetabular components in hip revision surgery can lead to recurrent dislocation and significant bone loss. This highlights the potential risks associated with these devices, necessitating careful consideration in patient selection and surgical technique.

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Area of Science:

  • Orthopedic Surgery
  • Biomedical Engineering
  • Materials Science

Background:

  • Total hip arthroplasty (THA) is a common procedure for hip joint diseases.
  • Constrained acetabular components are used in revision THA to improve stability.
  • However, their long-term effects and potential complications require further investigation.

Observation:

  • Two cases of recurrent dislocation after THA with constrained acetabular components were identified.
  • These patients presented with significant postoperative periprosthetic acetabular bone loss.
  • The migrated acetabular component was implicated as the cause of bone loss.

Findings:

  • Mechanical impingement at the bone-prosthesis interface may increase stress and lead to bone resorption.
  • Sharp screw ends and the metal shell of the component may contribute to acetabular bone erosion.
  • Recurrent dislocation and substantial bone loss were observed complications.

Implications:

  • The use of constrained acetabular components carries a potential risk of severe complications, including bone loss.
  • These findings suggest a need for caution when selecting and implanting constrained acetabular components.
  • Further research is warranted to understand the biomechanics and failure modes of these devices to improve patient outcomes.