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Related Concept Videos

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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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

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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.
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...

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Ballistic Forearm Fractures are Associated with Higher Neurovascular Injury, Nonunion, and Complications Compared to Blunt Forearm Injuries.

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Related Experiment Video

Updated: May 28, 2026

Establishing a Diaphyseal Femur Fracture Model in Mice
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Atrophic Long-Bone Non-Union: Current Insights into Pathogenesis and Management-A Narrative Review.

Vasileios P Giannoudis1, Helena F Barber2, Vincenzo Giordano3

  • 1Academic Department of Trauma & Orthopaedic Surgery, School of Medicine, University of Leeds, Leeds LS2 9JT, UK.

Journal of Clinical Medicine
|May 27, 2026
PubMed
Summary

Atrophic non-union, a fracture healing complication, stems from multiple factors. This review explores its pathogenesis and management, offering an algorithmic approach for better treatment outcomes.

Keywords:
bone healingmesenchymal stem cellsnon-union

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Area of Science:

  • Orthopedics
  • Regenerative Medicine
  • Biomaterials Science

Background:

  • Fracture non-union, particularly atrophic non-union, is a significant clinical challenge with an underestimated incidence.
  • Its etiology is multifactorial, encompassing biological, mechanical, infectious, and host-related elements, leading to heterogeneous understanding and treatment approaches.

Purpose of the Study:

  • To review current knowledge on the pathogenesis of atrophic non-union.
  • To outline a structured, algorithmic approach for managing atrophic non-union.

Main Methods:

  • Structured narrative review of existing literature.
  • Analysis of inflammatory and immune responses, mesenchymal stem cells, bone morphogenetic proteins, and remodeling/angiogenesis mechanisms.
  • Development of a management algorithm.

Main Results:

  • Atrophic non-union pathogenesis involves complex interactions including inflammation, immune response, stem cell function, and vascularization.
  • An algorithmic approach is proposed, prioritizing infection exclusion, mechanical stability, host factor optimization, and enhancing the local non-union environment.

Conclusions:

  • Understanding the multifactorial pathogenesis is crucial for effective atrophic non-union treatment.
  • A systematic, algorithmic management strategy can improve treatment success rates for this challenging complication.