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Bone Disorders

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...

Essential Minerals for Bone Health

Essential Minerals for Bone Health

The minerals contained in all of the food we consume are essential for our organ systems. However, certain essential minerals, such as calcium, phosphorus, magnesium, manganese, and fluoride, largely affect bone health.
Calcium and Phosphorus
Calcium is a critical component of bones, especially in the form of calcium phosphate and calcium carbonate. Since the body cannot make calcium, it must be obtained from the diet. However, calcium cannot be absorbed from the small intestine without...

Bone Remodeling

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.

The Bone Matrix

The Bone Matrix

Bone contains a relatively small number of cells entrenched in a matrix of collagen fibers that provide an adherent surface for inorganic salt crystals. Both components of the matrix, organic and inorganic, contribute to the unusual properties of bone. Without collagen, bones would be brittle and shatter easily. Without mineral crystals, bones would flex and provide little support. This can be observed by an experiment: when the minerals of a bone are dissolved by soaking the bone in...

Bone Remodeling and Repair

Bone Remodeling and Repair

Role of Vitamins in Maintaining Bone Health

Role of Vitamins in Maintaining Bone Health

The growth and maintenance of bone are regulated by a combination of nutritional factors, including vitamins, such as vitamin A, B12, C, D, and K.
Vitamin A
Vitamin A is involved in the process of bone remodeling. Retinoic acid, the active metabolite of Vitamin A, has nuclear receptors in osteoblasts and osteoclasts, which are involved in bone remodeling.
Vitamin B12
Vitamin B12 acts as a cofactor during the formation of osteoblast-related proteins, such as osteocalcin. Vitamin B12 plays a role...

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Related Experiment Video

Updated: Mar 19, 2026

Scanning Skeletal Remains for Bone Mineral Density in Forensic Contexts

Scanning Skeletal Remains for Bone Mineral Density in Forensic Contexts

Published on: January 29, 2018

Bone mineral density: testing for osteoporosis.

Angela Sheu¹, Terry Diamond¹

¹University of New South Wales, Sydney.

Australian Prescriber

|June 25, 2016

Summary

This summary is machine-generated.

Osteoporosis involves bone loss from aging or reversible conditions. Diagnosis uses X-rays and bone density scans, with T-scores and Z-scores guiding treatment decisions for fracture prevention.

Keywords:

bone densitometry bone density fracture of bone osteoporosis

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Last Updated: Mar 19, 2026

Scanning Skeletal Remains for Bone Mineral Density in Forensic Contexts

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Semiautomated Longitudinal Microcomputed Tomography-based Quantitative Structural Analysis of a Nude Rat Osteoporosis-related Vertebral Fracture Model

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Cortical Bone Assessment Using Ultrasonic Guided Waves: A Reproducibility Study in a Healthy Population

Cortical Bone Assessment Using Ultrasonic Guided Waves: A Reproducibility Study in a Healthy Population

Published on: January 31, 2025

Area of Science:

Orthopedics
Endocrinology
Radiology

Background:

Primary osteoporosis stems from aging-related bone loss.
Secondary osteoporosis arises from specific, potentially reversible conditions.
Vertebral fractures can be identified via thoracolumbar X-rays.

Purpose of the Study:

To outline diagnostic methods for osteoporosis.
To define criteria for osteoporosis diagnosis.
To establish fracture risk assessment guidelines.

Main Methods:

Dual-energy X-ray absorptiometry (DXA) is the gold standard for bone mineral density (BMD) measurement.
Total hip BMD predicts hip fracture risk; lumbar spine BMD monitors treatment efficacy.
T-scores compare patient BMD to young, healthy individuals; Z-scores compare to age-matched peers.

Main Results:

Osteoporosis is defined by a femoral neck T-score of -2.5 or less.
A Z-score of -2.5 or less suggests secondary osteoporosis.
Clinical risk calculators predict 10-year fracture probability.

Conclusions:

Abnormal fracture probability (hip >5%, any >20%) warrants treatment.
DXA scans and risk calculators are crucial for managing osteoporosis.
Differentiating primary and secondary osteoporosis is key for effective intervention.