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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...

The Effect of Aging on Tissues

The Effect of Aging on Tissues

Several body functions deteriorate with age. The external signs of aging are easily identifiable. For example, the skin becomes dry, less elastic, and thins out, forming wrinkles. The skin of the face begins to appear looser due to a decrease in the levels of elastic and collagen fibers in the connective tissue. Additionally, melanin production in the hair follicle decreases with age, resulting in gray hair. Moreover, the senses of sight and hearing decline, so glasses and hearing aids may...

Changes in the Appendicular Skeleton with Age

Changes in the Appendicular Skeleton with Age

The upper and lower limb initially develops as a small bulge called a limb bud, which appears on the lateral side of the early embryo. The upper limb bud appears near the end of the fourth week of development, with the lower limb bud appearing shortly after.
Initially, the limb buds consist of a core of mesenchyme covered by a layer of ectoderm. The ectoderm at the end of the limb bud thickens to form a narrow crest called the apical ectodermal ridge. This ridge stimulates the underlying...

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...

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.

Aging

Aging

Aging is a complex biological phenomenon influenced by various processes that affect cellular and systemic functions. Several prominent theories attempt to explain its mechanisms, highlighting cellular limitations, oxidative damage, and hormonal changes as central factors in aging.
Cellular Clock Theory
The cellular clock theory posits that the human lifespan is closely tied to the finite capacity of cells to divide, a phenomenon governed by telomeres, which are protective caps at the ends of...

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Related Experiment Video

Updated: Jun 9, 2026

Cantilever Bending of Murine Femoral Necks

Cantilever Bending of Murine Femoral Necks

Published on: January 5, 2022

The pathophysiology of the aging skeleton.

Farhan A Syed¹, Alvin C Ng

¹Abbott Bioresearch Center, Worcester, MA 01545, USA. Farhan.syed@abbott.com

Current Osteoporosis Reports

|September 8, 2010

Summary

Aging increases osteoporosis risk in the elderly due to age-related bone loss. Understanding intrinsic and extrinsic factors influencing skeletal health is crucial for managing this condition.

Area of Science:

Gerontology and Skeletal Health
Bone Biology and Aging

Background:

Global elderly population growth necessitates understanding age-related diseases.
Osteoporosis and fractures are significant health risks for older adults.
Recent research has advanced the understanding of age-related bone pathologies.

Purpose of the Study:

To review current concepts in age-related skeletal modulation.
To discuss intrinsic and extrinsic factors affecting bone health in aging.
To explore the relationship between bone and adipose tissue.

Main Methods:

Review of clinical and translational studies.
Analysis of intrinsic factors: genetics, hormones, oxidative stress, telomere length.
Examination of extrinsic factors: nutrition, lifestyle choices.

Related Experiment Videos

Last Updated: Jun 9, 2026

Cantilever Bending of Murine Femoral Necks

Cantilever Bending of Murine Femoral Necks

Published on: January 5, 2022

Main Results:

Aging impacts the skeleton through various intrinsic and extrinsic pathways.
Genetics, hormonal shifts, oxidative stress, and telomere dynamics play key roles.
Nutritional and lifestyle choices significantly influence age-related bone health.

Conclusions:

A comprehensive understanding of aging's skeletal effects is evolving.
Multiple factors contribute to age-related bone loss and osteoporosis.
Further research into bone-fat interactions may offer new therapeutic avenues.