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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...
Compact Bone01:27

Compact Bone

Most bones contain compact and spongy osseous tissue, but their distribution and concentration vary based on the bone's overall function.
Compact bone, also called cortical bone, is the denser, stronger of the two types of bone tissue. It is found under the periosteum and in the diaphyses of long bones, where it provides support and protection. The microscopic structural unit of compact bone is called an osteon, or haversian system. Each osteon is composed of concentric rings of calcified...
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 Structure01:55

Bone Structure

Within the skeletal system, the structure of a bone, or osseous tissue, can be exemplified in a long bone, like the femur, where there are two types of osseous tissue: cortical and cancellous.
Gross Anatomy of Bone01:17

Gross Anatomy of Bone

The two main features of a long bone are the diaphysis and the epiphysis.
The diaphysis is the tubular shaft that runs between the proximal and distal ends of the bone. The walls of the diaphysis are composed of dense and hard compact bone made of numerous osteons — the functional unit of the compact bone. The hollow region in the diaphysis is called the medullary cavity, which harbors the bone marrow. In infants and children, this marrow cavity is filled with red marrow, whereas in adults, it...

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Related Experiment Video

Updated: Jun 5, 2026

Modeling Primary Bone Tumors and Bone Metastasis with Solid Tumor Graft Implantation into Bone
06:53

Modeling Primary Bone Tumors and Bone Metastasis with Solid Tumor Graft Implantation into Bone

Published on: September 9, 2020

[Benign bone tumors].

A A Kamand1, J Warzecha, S Schneider

  • 1Klinik für spezielle Orthopädie und Orthopädische Chirurgie, Orthopädische Universitätsklinik Frankfurt, Frankfurt am Main, Deutschland. a.kamand@friedrichsheim.de

Der Orthopade
|January 12, 2011
PubMed
Summary
This summary is machine-generated.

Benign bone tumors are non-cancerous growths in bone, classified by their matrix. Understanding these tumors is crucial for physicians to differentiate between harmless lesions and those with potential for recurrence, destruction, or malignant transformation.

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Last Updated: Jun 5, 2026

Modeling Primary Bone Tumors and Bone Metastasis with Solid Tumor Graft Implantation into Bone
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Area of Science:

  • Orthopedic Oncology
  • Bone Pathology

Context:

  • Benign bone tumors are neoplasms originating in bone, lacking malignant criteria like infiltrative growth or metastases.
  • Classification follows WHO criteria based on tumor matrix (osseous, cartilaginous, fibrous).
  • Includes non-neoplastic, tumor-like lesions traditionally grouped with benign tumors.

Purpose:

  • To differentiate benign bone tumors from malignant neoplasms.
  • To inform physicians about the behavior of various benign bone lesions, including recurrence and destructive potential.
  • To highlight tumors with a risk of malignant transformation, such as large enchondromas.

Summary:

  • Benign bone tumors are classified by the World Health Organization (WHO) based on their tissue matrix.
  • Physicians must distinguish between harmless lesions and those with potential for local destruction or recurrence.
  • Certain benign tumors, like enchondromas, carry a risk of malignant transformation.

Impact:

  • Facilitates accurate diagnosis and appropriate management of bone neoplasms.
  • Guides treatment strategies, ranging from observation to surgical intervention.
  • Improves patient outcomes by identifying lesions requiring closer monitoring or aggressive treatment.