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Related Concept Videos

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...
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 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...
Bone Remodeling01:40

Bone Remodeling

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.
Bone Formation by Endochondral Ossification01:24

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...
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...

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Related Experiment Video

Updated: Jul 19, 2026

Creating Rigidly Stabilized Fractures for Assessing Intramembranous Ossification, Distraction Osteogenesis, or Healing of Critical Sized Defects
07:35

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Osteogenesis imperfecta: new treatment options.

Guillaume Chevrel1, Rolando Cimaz

  • 1Department of Pediatrics, Edouard Herrriot Hospital, 5, place d'Arsonval, 69437 Lyon Cedex 03, France.

Current Rheumatology Reports
|November 10, 2006
PubMed
Summary

Osteogenesis imperfecta treatments for children and adults are evolving. While bisphosphonates show promise, especially in children, further research is needed for adult treatments and fracture rate reduction. Gene therapy offers a novel approach.

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Area of Science:

  • Orthopedics and Regenerative Medicine
  • Pediatric Endocrinology
  • Genetic Disorders

Background:

  • Osteogenesis imperfecta (OI) is a rare genetic disorder characterized by brittle bones.
  • Current management for OI involves rehabilitation therapy and orthopedic surgery.
  • Bisphosphonates represent a newer therapeutic class, with intravenous pamidronate studied mainly in pediatric cohorts.

Purpose of the Study:

  • To review current and emerging treatments for osteogenesis imperfecta in both pediatric and adult populations.
  • To evaluate the established efficacy of bisphosphonates and identify gaps in adult treatment protocols.
  • To introduce novel therapeutic strategies, including gene therapy, for OI.

Main Methods:

  • Literature review of classic and contemporary osteogenesis imperfecta treatments.
  • Analysis of existing data on bisphosphonate efficacy, particularly intravenous pamidronate in children.
  • Exploration of novel approaches such as gene replacement therapy using mesenchymal stem cells and COL1A1 gene inactivation.

Main Results:

  • Rehabilitation therapy and orthopedic surgery remain standard treatments for OI.
  • Intravenous pamidronate has demonstrated effects primarily in pediatric OI patients.
  • Established treatment protocols for adult OI patients are lacking, and further studies are required to confirm fracture rate reduction for various treatments in all age groups.

Conclusions:

  • Bisphosphonates are a significant advancement in OI treatment, particularly for children.
  • There is a critical need for more research into effective treatments for adult patients with OI.
  • Gene therapy, utilizing mesenchymal stem cells and gene inactivation techniques, presents a promising future direction for OI management.