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Related Concept Videos

Bone Formation by Intramembranous Ossification01:29

Bone Formation by Intramembranous Ossification

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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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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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The two main features of a long bone are the diaphysis and the epiphysis.
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Bone as Supporting Connective Tissue01:23

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Bone tissue forms the internal skeleton of vertebrate animals, providing structure to the body.
Bone Matrix
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Sutures of the Skull01:22

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The human skull is composed of several bones that come together to protect the brain and support the structures of the face. The junctions where these bones meet are called sutures.
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Growth of Cartilage and Bone Tissue01:27

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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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Direct Mouse Trauma/Burn Model of Heterotopic Ossification
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Heterotopic Ossification: Basic-Science Principles and Clinical Correlates.

Kavitha Ranganathan1, Shawn Loder1, Shailesh Agarwal1

  • 1Department of Surgery, University of Michigan Health Systems, 1500 East Medical Center Drive, Taubman Center, XPC 5340, Ann Arbor, MI 48109-0219. E-mail address for B. Levi: blevi@umich.edu.

The Journal of Bone and Joint Surgery. American Volume
|July 3, 2015
PubMed
Summary
This summary is machine-generated.

Heterotopic ossification, or ectopic bone formation, often follows trauma or surgery. Prevention and surgical removal are key, with future treatments targeting specific molecular pathways.

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Area of Science:

  • Orthopedic Surgery
  • Regenerative Medicine
  • Cell Biology

Background:

  • Heterotopic ossification (HO) is the abnormal formation of bone in soft tissues, frequently complicating joint arthroplasty, traumatic brain injury, and fractures.
  • Cellular mechanisms involve progenitor cell differentiation influenced by local environmental factors like oxygen, pH, nutrients, and mechanical stress.
  • Common triggers include joint replacement, spinal cord injury, traumatic brain injury, blast trauma, fractures, and thermal injuries.

Purpose of the Study:

  • To review the pathophysiology, common causes, and current management strategies for heterotopic ossification.
  • To highlight established prophylactic and therapeutic interventions.
  • To discuss emerging therapeutic targets for future treatment development.

Main Methods:

  • Literature review of heterotopic ossification, focusing on etiology, cellular mechanisms, prophylaxis, surgical treatment, and future directions.
  • Analysis of factors influencing progenitor cell differentiation into osteogenic precursors.
  • Synthesis of information on current clinical practices and research trends.

Main Results:

  • HO incidence is high after specific orthopedic procedures and traumatic injuries.
  • Environmental factors (oxygen, pH, nutrients, mechanical stimuli) critically regulate osteogenic differentiation.
  • Prophylaxis includes radiation and NSAIDs; surgical excision offers improved outcomes.
  • Future strategies aim to inhibit signaling pathways driving ectopic bone formation.

Conclusions:

  • Effective management of heterotopic ossification relies on a combination of prophylaxis, timely surgical intervention, and understanding of underlying cellular processes.
  • Targeting molecular pathways involved in ectopic bone formation represents a promising avenue for novel therapeutic development.
  • Continued research into the cellular and molecular drivers of HO is essential for advancing patient care.