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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...

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.

What is the Skeletal System?

What is the Skeletal System?

Osteoclasts in Bone Remodeling

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...

Fractures: Bone Repair

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Treatment for a fracture is based on the type of break, the bone affected, and the patient's age.
Minor fractures with no bone displacement are treated by immobilizing the fractured bone using a cast or splint. However, in the case of fractures with displaced bones, the broken bones are repositioned before immobilization to ensure successful healing without deformation and loss of function. The realignment of fractured bone ends is performed through a process called reduction. If the procedure...

The Functions of the Skeletal System

The Functions of the Skeletal System

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

Updated: Jul 1, 2026

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

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

Published on: September 28, 2017

Osteoporotic fractures: a brain or bone disease?

Stanley J Birge¹

¹Division of Geriatrics and Nutritional Science, Washington University School of Medicine, 4488 Forest Park Boulevard, St. Louis, MO 63108, USA. sbirge@im.wustl.edu

Current Osteoporosis Reports

|September 10, 2008

Summary

This summary is machine-generated.

Osteoporotic fractures are poorly predicted by bone density alone. Vitamin D deficiency contributes to bone fragility and brain changes, increasing fracture risk in older adults.

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Trabecular Bone Microarchitecture Evaluation in an Osteoporosis Mouse Model

Trabecular Bone Microarchitecture Evaluation in an Osteoporosis Mouse Model

Published on: September 8, 2023

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Last Updated: Jul 1, 2026

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

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

Published on: September 28, 2017

Trabecular Bone Microarchitecture Evaluation in an Osteoporosis Mouse Model

Trabecular Bone Microarchitecture Evaluation in an Osteoporosis Mouse Model

Published on: September 8, 2023

Area of Science:

Gerontology
Bone Biology
Neurology

Background:

Osteoporosis is a skeletal disorder increasing fracture risk.
Most osteoporotic fractures occur in women without diagnosed osteoporosis.
Bone density is a poor predictor of fracture risk; age is more critical.

Purpose of the Study:

To explore the relationship between osteoporosis, frailty, and fracture risk.
To investigate the role of Vitamin D deficiency in these conditions.
To understand osteoporotic fractures as a manifestation of multi-system disease.

Main Methods:

Review of existing literature on osteoporosis, frailty, and Vitamin D.
Analysis of factors contributing to fracture risk beyond bone density.
Examination of the interplay between musculoskeletal and central nervous systems.

Main Results:

Age and age-related factors are significant predictors of fracture.
Osteoporosis and frailty share common affected systems (musculoskeletal and central nervous).
Vitamin D deficiency is a key contributor to frailty, osteoporosis, and fractures.

Conclusions:

Osteoporotic fractures result from both bone and brain disease.
Vitamin D deficiency impacts bone fragility, muscle weakness, and neurological function.
Fracture risk assessment should consider systemic factors beyond bone density.