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Related Concept Videos

Bone Disorders01:29

Bone Disorders

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...
Fractures: Bone Repair01:27

Fractures: Bone Repair

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 procedure...
Bone Remodeling and Repair01:31

Bone Remodeling and Repair

Osteoclasts are cells responsible for bone resorption and remodeling. They originate from hematopoietic progenitor cells present in the bone marrow. Numerous progenitor cells fuse to form multinucleated cells, each with 10-20 nuclei. A single osteoclast has a diameter of 150 to 200 µM. These cells have ruffled borders that break down the underlying bone tissue and release minerals such as calcium into the blood in bone resorption. Osteoclasts cling to bones with their ruffled edges during bone...
Osteoclasts in Bone Remodeling01:31

Osteoclasts in Bone Remodeling

Osteoclasts are cells responsible for bone resorption and remodeling. They originate from hematopoietic progenitor cells present in the bone marrow. Numerous progenitor cells fuse to form multinucleated cells, each with 10-20 nuclei. A single osteoclast has a diameter of 150 to 200 µM. These cells have ruffled borders that break down the underlying bone tissue and release minerals such as calcium into the blood in bone resorption. Osteoclasts cling to bones with their ruffled edges during bone...
Stress-Strain Diagram - Brittle Materials01:24

Stress-Strain Diagram - Brittle Materials

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...
Flail Chest-I01:24

Flail Chest-I

Overview of Flail Chest
Flail chest is a severe and potentially life-threatening condition characterized by the fracture of three or more adjacent ribs in multiple places. It is most commonly caused by direct impacts and trauma, such as motor vehicle accidents or injuries from a steering wheel impact. It can also occur due to falls in elderly individuals with osteoporosis, or assaults involving sharp objects.
Pathophysiology
The pathophysiology of flail chest is complex, involving fractures of...

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Related Experiment Video

Updated: May 23, 2026

Fragility Assessment of Bovine Cortical Bone Using Scratch Tests
08:36

Fragility Assessment of Bovine Cortical Bone Using Scratch Tests

Published on: November 30, 2017

Bone fragility: current reviews and clinical features.

Paolo Tranquilli Leali1, Carlo Doria, Alexandros Zachos

  • 1Orthopaedic Department, University of Sassari, Sassari, Italy.

Clinical Cases in Mineral and Bone Metabolism : the Official Journal of the Italian Society of Osteoporosis, Mineral Metabolism, and Skeletal Diseases
|March 31, 2012
PubMed
Summary

Bone fragility, leading to fractures, stems from altered material and structural bone properties, not just reduced bone mass. Studying metabolic bone diseases reveals how collagen, mineral content, and remodeling impact bone strength.

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Area of Science:

  • Biomedical Engineering
  • Orthopedics
  • Metabolic Bone Diseases

Background:

  • Bone strength is crucial for preventing fractures and depends on bone mass and shape.
  • Reduced bone strength, or fragility, is linked to decreased bone mass, density, and compromised structural integrity.
  • Mechanical load on weakened bone, especially with reduced connectivity, increases fracture risk.

Purpose of the Study:

  • To reframe bone fragility not solely as a loss of bone mass.
  • To investigate the role of material and structural properties in determining bone fragility.
  • To understand how metabolic bone diseases elucidate these properties and their impact on bone strength.

Main Methods:

  • Analysis of factors contributing to bone strength, including mass and shape.
  • Examination of the relationship between reduced bone properties and fracture occurrence.
  • Study of metabolic bone diseases to understand material composition and structural changes.

Main Results:

  • Bone fragility is attributed to alterations in material composition and structural integrity, not just reduced bone quantity.
  • Metabolic bone diseases provide insights into how specific components (collagen, minerals) and processes (remodeling) affect bone structure and strength.
  • Abnormalities in material composition and structure resulting from these diseases lead to increased bone fragility.

Conclusions:

  • Bone fragility is a complex condition resulting from changes in bone's material and structural characteristics.
  • Understanding the interplay of collagen, mineral content, and remodeling is key to comprehending bone strength.
  • Metabolic bone diseases serve as critical models for studying the mechanisms underlying bone fragility and fracture risk.