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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.

Hormones and Bone Tissue

Hormones and Bone Tissue

The endocrine system produces and secretes hormones, which interact with the skeletal system. These hormones control bone growth, maintain bone once it is formed, and remodel it.
Hormones That Influence Osteoblasts and/or Maintain the Matrix
Several hormones are necessary for controlling bone growth and maintaining the bone matrix. The pituitary gland secretes growth hormone (GH), which, as its name implies, controls bone growth. This happens in several ways: first, it triggers chondrocyte...

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...

Skeleton and Calcium Homeostasis

Skeleton and Calcium Homeostasis

Calcium is not only the most abundant mineral in bone but also the most abundant mineral in the human body. Calcium ions are needed for bone mineralization, tooth health, heart rate regulation and strength of contraction, blood coagulation, the contraction of smooth and skeletal muscle cells, and the regulation of nerve impulse conduction. The average calcium level in the blood is about 10 mg/dL. When the body cannot maintain this level, a person will experience hypo or hypercalcemia.

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: Jun 27, 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

Monitoring changes in bone density.

Sydney Lou Bonnick¹

¹Clinical Research Center of North Texas, Denton, Texas, USA. sbonnickcrcnt@verizon.net

Women'S Health (London, England)

|December 17, 2008

Summary

Understanding bone density changes is crucial for assessing osteoporosis treatment effectiveness. Measuring bone mineral density (BMD) changes helps interpret fracture risk reduction, but requires knowledge of precision and least significant change.

Area of Science:

Osteoporosis Research
Bone Metabolism
Clinical Biomechanics

Background:

The link between low bone density and fracture risk is established, but the benefit of increasing bone density on fracture risk reduction is less understood.
Clinical utility of bone density measurements to assess osteoporosis treatment efficacy is debated.
Apparent changes in bone density can be misinterpreted without statistical context.

Purpose of the Study:

To clarify the clinical utility of bone density measurements in assessing osteoporosis therapies.
To explain the statistical concepts of precision and least significant change (LSC) in interpreting bone density data.
To underscore the importance of understanding BMD changes for effective osteoporosis management.

Main Methods:

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Scanning Skeletal Remains for Bone Mineral Density in Forensic Contexts

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Published on: January 29, 2018

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

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Review of clinical trial data supporting bone density assessment.

Explanation of statistical concepts: precision and least significant change.

Illustrative examples of interpreting serial bone density measurements.

Main Results:

Substantial clinical trial data supports the use of bone density changes to evaluate therapeutic efficacy.
Understanding precision and least significant change is essential for accurate interpretation of serial bone density measurements.
Without knowing the least significant change, serial bone density data is uninterpretable.

Conclusions:

Changes in bone mineral density (BMD) are clinically important for evaluating osteoporosis treatment.
Accurate interpretation of BMD changes requires understanding statistical precision and least significant change.
These statistical concepts are vital for assessing the effectiveness of therapies aimed at reducing fracture risk.