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Related Concept Videos

Bone Remodeling01:40

Bone Remodeling

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Bone remodeling is a continuous and balanced process of bone resorption by osteoclasts and bone formation by osteoblasts. In adults, it helps maintain bone mass and calcium homeostasis. While mechanical stress can stimulate turnover as part of the normal maintenance and reparative process, several hormones also regulate bone remodeling.
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Osteoclasts in Bone Remodeling01:31

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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...
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Bone Formation by Intramembranous Ossification01:29

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Intramembranous ossification is one of the two processes involved in the development of bones within an embryo. The flat bones of the face, most of the cranial bones, and the clavicles are formed via this process. During intramembranous ossification, the bones develop directly from sheets of undifferentiated mesenchymal connective tissue.
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Bone Formation by Endochondral Ossification01:24

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Bone formation, or ossification, begins around the sixth to seventh week of embryonic development. Most bones develop from a cartilaginous template through the process of endochondral ossification. Cartilage formation begins when clusters of mesenchymal cells differentiate into chondrocytes. These chondrocytes proliferate rapidly and secrete an extracellular matrix that becomes encased in a membrane called the perichondrium. The resulting cartilage model provides a template that resembles the...
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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.
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Bone Cells and Tissue01:30

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Bones contain a relatively small number of cells entrenched in a matrix of organic and inorganic components. Although bone cells compose only a small amount of the bone volume, they are crucial to its function. Four types of cells are found within the bone tissue— osteoblasts, osteocytes, osteogenic cells, and osteoclasts.
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Related Experiment Video

Updated: Jan 2, 2026

Improved Methodology for Studying Postnatal Osteogenesis via Intramembranous Ossification in a Murine Bone Marrow Injury Model
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Improved Methodology for Studying Postnatal Osteogenesis via Intramembranous Ossification in a Murine Bone Marrow Injury Model

Published on: February 7, 2025

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[Bone Replacement and Bone Formation].

Christian Heiß, Markus Rupp, Gero Knapp

    Zeitschrift Fur Orthopadie Und Unfallchirurgie
    |December 4, 2019
    PubMed
    Summary
    This summary is machine-generated.

    Autologous cancellous bone grafting is the gold standard for bone defects. Future bone replacement materials will combine existing substances with growth factors and ions for enhanced bone healing.

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    Area of Science:

    • Orthopedic surgery and biomaterials science.
    • Focuses on bone defect treatment and bone regeneration strategies.

    Background:

    • Autologous cancellous bone grafting is the current gold standard for bone defects due to its osteoinductive, osteoconductive, and osteointegrative properties.
    • Bone replacement materials, particularly calcium phosphates (ceramics and cements), are gaining importance in orthopedics and trauma surgery.

    Purpose of the Study:

    • To discuss the strategic considerations for surgeons when selecting bone defect replenishment methods.
    • To explore the future development of bone replacement materials for improved orthopedic and trauma surgical outcomes.

    Main Methods:

    • Review of current standards and practices in bone grafting and bone substitute utilization.
    • Analysis of the properties required for effective bone defect management.
    • Discussion on the potential of future composite materials incorporating growth factors and bioactive ions.

    Main Results:

    • Autologous cancellous bone grafting fulfills all essential requirements for bone defect treatment.
    • Calcium phosphates are key bone replacement materials currently available.
    • No established standards exist for the indication and use of bone replacement materials.

    Conclusions:

    • Surgeons must develop preoperative strategies to determine the necessity and type of bone substitute for defect repair.
    • Future bone replacement materials will likely be advanced composites designed to enhance osteoinduction, osteoconduction, osteointegration, and osteogenesis.
    • The development of standardized guidelines for bone replacement material application is crucial.