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Related Concept Videos

Fatigue01:21

Fatigue

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Fatigue occurs when materials rupture under repeated or fluctuating loads, even at stress levels far below their static breaking strength. It typically results in brittle failure, even for ductile materials. It is a critical consideration in designing machines and structural components subjected to repetitive or varying loads. The nature of these loadings can range from fluctuating loads like unbalanced pump impellers causing vibrations to repeatedly bending a thin steel rod wire back and forth...
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Fractures: Bone Repair01:27

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Treatment for a fracture is based on the type of break, the bone affected, and the patient's age.
Minor fractures with no bone displacement are treated by immobilizing the fractured bone using a cast or splint. However, in the case of fractures with displaced bones, the broken bones are repositioned before immobilization to ensure successful healing without deformation and loss of function. The realignment of fractured bone ends is performed through a process called reduction. If the...
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Bone Disorders01:29

Bone Disorders

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Aging and its effect on bone remodeling is the most common cause of bone disorders. In young and healthy people, bone deposition and resorption happen at an equal rate to maintain optimal bone health.
Bone deposition is also affected by the levels of sex hormones like estrogen and testosterone that promote osteoblast activity and bone matrix synthesis. When the level of these hormones decreases due to aging, it causes a reduction in bone deposition. As a result, bone resorption by osteoclasts...
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Stress-Strain Diagram - Brittle Materials01:24

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Brittle materials, including glass, cast iron, and stone, exhibit unique characteristics. They fracture without considerable change in their elongation rate, indicating that their breaking and ultimate strength are equivalent. Such materials also show lower strain levels at the point of rupture. The failure in brittle materials predominantly results from normal stresses, as evidenced by the rupture created along a surface perpendicular to the applied load. These materials do not display...
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Thermal Stress01:09

Thermal Stress

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If the temperature of an object is changed while it is prevented from expanding or contracting, the object is subjected to stress. The stress is compressive if the object expands in the absence of constraint and tensile if it contracts. This stress resulting from temperature change is known as thermal stress. It can be quite large and can cause damage. To avoid this stress, engineers may design components so they can expand and contract freely. For instance, on highways, gaps are deliberately...
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Disorders of the Skeletal Muscle01:28

Disorders of the Skeletal Muscle

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The clinical conditions affecting the skeletal muscle tissue are broadly categorized as musculoskeletal and neuromuscular disorders.
Musculoskeletal disorders
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Subject-specific Musculoskeletal Model for Studying Bone Strain During Dynamic Motion
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[Stress fractures].

Eric Thein1, Jaad Mahlouly1

  • 1Service d'orthopédie-traumatologie, Département de l'appareil locomoteur, CHUV, 1011 Lausanne.

Revue Medicale Suisse
|December 17, 2019
PubMed
Summary
This summary is machine-generated.

Stress fractures are bony overuse injuries caused by an imbalance in bone repair. Diagnosis relies on patient history and MRI, with prevention being crucial due to lengthy treatments and complication risks.

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Area of Science:

  • Orthopedics
  • Sports Medicine
  • Geriatrics

Background:

  • Stress fractures are bony overuse lesions resulting from an imbalance between bone regeneration and resorption.
  • Two types exist: fatigue fractures (young, active individuals) and insufficiency fractures (elderly with low bone density).

Purpose of the Study:

  • To provide a comprehensive overview of stress fracture types, diagnostics, and prevention.
  • To highlight the importance of early diagnosis and multidisciplinary prevention strategies.

Main Methods:

  • Review of existing literature on stress fracture pathophysiology, classification, and management.
  • Emphasis on diagnostic modalities, particularly Magnetic Resonance Imaging (MRI).

Main Results:

  • Stress fractures stem from an imbalance favoring bone resorption over regeneration.
  • Fatigue fractures occur in active individuals due to increased stress, while insufficiency fractures affect the elderly with reduced bone density under physiological stress.
  • MRI is the preferred imaging modality for diagnosis.

Conclusions:

  • Thorough patient history and MRI are essential for diagnosing stress fractures.
  • Prevention is paramount due to the time-consuming nature of treatment and potential complications.
  • A multidisciplinary approach is necessary for effective stress fracture prevention.