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Fractures: Bone Repair

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 Repair

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 Remodeling

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...

Bone Formation by Intramembranous Ossification

Bone Formation by Intramembranous Ossification

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.
The process begins when mesenchymal cells in the embryonic skeleton gather together and differentiate into osteogenic cells, which then develop into...

Bone Disorders

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...

Bone Formation by Endochondral Ossification

Bone Formation by Endochondral Ossification

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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Related Experiment Video

Updated: May 23, 2026

Creating Rigidly Stabilized Fractures for Assessing Intramembranous Ossification, Distraction Osteogenesis, or Healing of Critical Sized Defects

Creating Rigidly Stabilized Fractures for Assessing Intramembranous Ossification, Distraction Osteogenesis, or Healing of Critical Sized Defects

Published on: April 11, 2012

Recent advances in osteogenesis imperfecta.

¹Department of Medicine, Faculty of Medical & Health Sciences, University of Auckland, Private Bag 92019, Auckland, New Zealand. t.cundy@auckland.ac.nz

Calcified Tissue International

|March 28, 2012

Summary

This summary is machine-generated.

Osteogenesis imperfecta (OI) is a group of genetic disorders causing bone fragility. Recent discoveries reveal new forms linked to collagen modification and bone homeostasis, impacting classification and treatment.

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

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

Published on: February 7, 2025

Area of Science:

Genetics
Orthopedics
Molecular Biology

Background:

Osteogenesis imperfecta (OI) is a group of inherited disorders characterized by bone fragility and recurrent fractures.
While most OI cases stem from mutations in type I collagen genes, recent research has identified recessive forms.
These rarer forms involve defects in collagen post-translational modification or bone matrix homeostasis.

Purpose of the Study:

To review recent discoveries in osteogenesis imperfecta.
To present an updated approach to the classification and diagnosis of OI.
To discuss the current use and unresolved questions regarding bisphosphonate therapy in OI patients.

Main Methods:

Literature review of recent genetic and clinical findings in osteogenesis imperfecta.
Analysis of diagnostic criteria and classification systems for OI.
Evaluation of current therapeutic strategies, focusing on bisphosphonates.

Main Results:

Identification of novel genetic causes for recessive forms of OI.
Refined understanding of the molecular mechanisms underlying collagen modification and bone matrix regulation in OI.
Ongoing debate regarding optimal bisphosphonate use, efficacy in milder phenotypes, and potential adverse effects.

Conclusions:

Recent advances have expanded the understanding of OI's genetic heterogeneity.
Updated classification and diagnostic approaches are crucial for managing diverse OI phenotypes.
Further research is needed to optimize bisphosphonate therapy and address safety concerns in OI treatment.