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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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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 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.
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The bones of the human skeletal system are of varied shapes, sizes, and functions. They can be classified based on their shape and function into four major classes: long bones, short bones, flat bones, and irregular bones. Some classifications include a fifth type, the sesamoid bones, as a separate class, whereas others categorize them under short bones.
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The most apparent functions of the skeletal system are support, protection, and movement. However, bone tissue also performs several other critical metabolic functions. For one, the bone matrix acts as a reservoir for a number of minerals important to the functioning of the body, especially calcium and phosphorus. These minerals, present in the bone tissue, can be released back into the bloodstream when required. Calcium ions, for example, are essential for muscle contractions and controlling...
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Related Experiment Video

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Author Spotlight: An Economic and Efficient Method for Quantitative Evaluation of Bone Microarchitecture in a Murine Osteoporosis Model
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Classification of Osteoporosis.

S S Amarnath1, Vishal Kumar2, S Lakshmana Das3

  • 1Trauma and Orthopedic Surgeon, Trinity Central Hospital, Bangalore, India.

Indian Journal of Orthopaedics
|December 18, 2023
PubMed
Summary

Osteoporosis is a condition of low bone quality and strength, increasing fracture risk. It is classified as primary (aging/menopause) or secondary (pathological conditions/medications), with diagnosis aided by bone density testing and fracture risk assessment tools.

Keywords:
ClassificationMenopauseOsteoporosis

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Area of Science:

  • Endocrinology
  • Gerontology
  • Orthopedics

Background:

  • Osteoporosis is characterized by diminished bone quality and strength, leading to a higher risk of fractures.
  • It is categorized into primary osteoporosis (linked to aging and menopause) and secondary osteoporosis (resulting from medical conditions or medications).

Purpose of the Study:

  • To outline the classification and diagnostic criteria for osteoporosis.
  • To explain the role of bone mineral density (BMD) testing and the Fracture Risk Assessment Tool (FRAX) in evaluating fracture risk.

Main Methods:

  • Classification of osteoporosis into primary (Type I/postmenopausal, Type II/senile) and secondary forms based on causative factors.
  • Utilizing Bone Mineral Density (BMD) testing with DEXA scans, employing T-scores for postmenopausal women and men aged 50+, and Z-scores for premenopausal women, younger adults, and children.
  • Employing the Fracture Risk Assessment Tool (FRAX) algorithm to predict 10-year probabilities of major osteoporotic fractures and hip fractures.

Main Results:

  • Primary osteoporosis is associated with aging and menopause, while secondary osteoporosis arises from other medical issues or treatments.
  • BMD testing with DEXA, using T-scores or Z-scores, is crucial for assessing bone health across different demographics.
  • The FRAX tool integrates clinical risk factors and BMD to provide a comprehensive fracture risk assessment.

Conclusions:

  • Accurate classification and diagnosis of osteoporosis are essential for effective management.
  • BMD testing and FRAX are vital tools for identifying individuals at high risk of osteoporotic fractures.
  • Understanding the different types and diagnostic approaches to osteoporosis is key for clinical practice.