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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...
Bone Formation by Intramembranous Ossification01:29

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...
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 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...
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 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...

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Related Experiment Video

Updated: Jun 6, 2026

Minimally Invasive Treatment for Thoracolumbar Burst Fracture Using Sagittal Alignment Screws and A Trauma Reduction Device
04:19

Minimally Invasive Treatment for Thoracolumbar Burst Fracture Using Sagittal Alignment Screws and A Trauma Reduction Device

Published on: November 8, 2024

Challenges to bone formation in spinal fusion.

Jeremy J Reid1, Jared S Johnson, Jeffrey C Wang

  • 1Department of Orthopaedic Surgery, David Geffen School of Medicine, University of California, Los Angeles, USA.

Journal of Biomechanics
|November 13, 2010
PubMed
Summary

Spinal fusion (arthrodesis) success depends on balancing biology and surgical technique. Ongoing research explores new materials, stem cells, and growth factors to improve bone formation and fusion rates.

Related Experiment Videos

Last Updated: Jun 6, 2026

Minimally Invasive Treatment for Thoracolumbar Burst Fracture Using Sagittal Alignment Screws and A Trauma Reduction Device
04:19

Minimally Invasive Treatment for Thoracolumbar Burst Fracture Using Sagittal Alignment Screws and A Trauma Reduction Device

Published on: November 8, 2024

Area of Science:

  • Orthopedic Surgery
  • Regenerative Medicine
  • Biomaterials Science

Background:

  • Spinal arthrodesis is increasingly common, but pseudarthrosis remains a clinical challenge.
  • Understanding spinal fusion requires integrating biological factors, surgical techniques, and biomechanics.

Purpose of the Study:

  • To review current research in spinal fusion, focusing on biological and technical advancements.
  • To foster collaboration between researchers modeling bone hierarchy and clinicians.

Main Methods:

  • Review of current literature on spinal fusion.
  • Analysis of biomechanics, anatomical considerations, and graft materials.
  • Evaluation of translational animal models and emerging therapeutic strategies.

Main Results:

  • Successful spinal fusion requires a complex interplay of biological factors and surgical technique.
  • Anatomical variations and biomechanics influence fusion site success.
  • Adjuvant therapies like allografts and synthetic cages can enhance fusion rates.

Conclusions:

  • Optimizing spinal fusion involves materials science, stem cell therapy, growth factors, and advanced surgical techniques.
  • Diverse animal models are crucial for evaluating novel therapeutics for spinal pathology.