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Related Concept Videos

Bone Disorders01:29

Bone Disorders

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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.
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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.
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...
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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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Growth of Cartilage and Bone Tissue01:27

Growth of Cartilage and Bone Tissue

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Chondrocytes form a temporary cartilaginous model by dividing and secreting a thick gel-like extracellular matrix. Once the chondrocytes undergo programmed cell death, osteoblasts enter the site of the cartilaginous model. The process of replacing the temporary cartilaginous model with bone in an ordered manner is called endochondral ossification. In endochondral ossification, not all of the cartilage is replaced by bone tissue. Some cartilage that performs a protective and supportive function...
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Real-time Visualization and Analysis of Chondrocyte Injury Due to Mechanical Loading in Fully Intact Murine Cartilage Explants
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[Juvenile osteochondrosis and osteonecrosis].

Katharina Schultz1, Dominique Stüwe2, Bettina Westhoff2

  • 1Klinik für Orthopädie und Unfallchirurgie, Universitätsklinikum Düsseldorf, Moorenstr. 5, 40225, Düsseldorf, Deutschland. katharina.schultz@med.uni-duesseldorf.de.

Orthopadie (Heidelberg, Germany)
|September 6, 2022
PubMed
Summary
This summary is machine-generated.

Juvenile osteonecrosis, a bone circulatory disorder in adolescents, requires prompt diagnosis and management. Early recognition and reduced mechanical loading are key to favorable outcomes and healthy bone development.

Keywords:
AdolescentsFemur head necrosisOsteochondritis dissecansOverweightSports

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Area of Science:

  • Orthopedics
  • Pediatric Bone Health

Background:

  • Juvenile osteonecrosis affects various body regions in adolescents.
  • Characterized by unknown etiology and a progressive course, it stems from local osseous circulatory disorders.

Purpose of the Study:

  • To summarize the understanding of juvenile osteonecrosis.
  • To outline diagnostic and therapeutic strategies for this condition.

Main Methods:

  • Review of risk factors including mechanical overloading (obesity, sports, misalignment).
  • Diagnostic approaches utilizing radiologic imaging to observe bony remodeling.
  • Therapeutic strategies focusing on reduced mechanical loading and surgical intervention when necessary.

Main Results:

  • Healing is contingent upon the location and extent of osseous necrosis.
  • Radiologic imaging is crucial for monitoring disease progression.
  • Treatment success is linked to timely intervention and management of mechanical stress.

Conclusions:

  • Effective management of juvenile osteonecrosis is vital for patient development.
  • Understanding risk factors and employing appropriate diagnostics and therapies improve outcomes.