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Related Concept Videos

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

Growth of Cartilage and Bone Tissue

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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Establishment and Evaluation of a Sheep Model of Full-thickness Osteochondral Defect
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[Osteochondritis dissecans].

N Reha Tandoğan1, Fevzi Ozgür, Tolga Akkaya

  • 1Ortoklinik, Cankaya Hastanesi Ortopedi ve Travmatoloji Kliniği, Başkent Universitesi Tip Fakültesi Ortopedi ve Travmatoloji Anabilim Dali, Konya Uygulama ve Araştirma Merkezi, Turkey. rtandogan@ortoklinik.com

Acta Orthopaedica Et Traumatologica Turcica
|October 11, 2008
PubMed
Summary

Osteochondritis dissecans (OCD) is a bone condition affecting both children and adults. While juvenile OCD may heal spontaneously, adult OCD requires surgical intervention for optimal outcomes.

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Area of Science:

  • Orthopedics
  • Sports Medicine
  • Regenerative Medicine

Background:

  • Osteochondritis dissecans (OCD) is a joint disease characterized by necrotic bone separation.
  • Juvenile OCD has a high spontaneous resolution rate, unlike the adult form which rarely heals.
  • Diagnosis relies on X-rays, with MRI crucial for assessing stability and progression.

Purpose of the Study:

  • To review diagnostic and treatment strategies for osteochondritis dissecans.
  • To differentiate management approaches for juvenile versus adult OCD.
  • To discuss surgical techniques for stable and unstable lesions.

Main Methods:

  • Review of current literature on OCD diagnosis and treatment.
  • Analysis of imaging modalities (X-ray, MRI) for lesion evaluation.
  • Comparison of conservative versus surgical treatment protocols.

Main Results:

  • MRI is essential for determining lesion stability and guiding treatment.
  • Stable juvenile OCD may be managed conservatively.
  • Surgical intervention is necessary for adult OCD and unstable pediatric cases.

Conclusions:

  • Treatment for OCD depends on patient age and lesion stability.
  • Arthroscopic antegrade perforation is indicated for stable lesions to promote healing.
  • Complex cases with loose fragments require cartilage reconstruction techniques.