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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...

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Bone Remodeling

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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.

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...

The Functions of the Skeletal System

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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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Marble Bone Disease: A Rare Bone Disorder.

Eswaran Arumugam¹, Maheswari Harinathbabu², Ranjani Thillaigovindan¹

¹Prosthodontics, Thai Moogambigai Dental College and Hospital.

|November 24, 2015

Summary

Osteopetrosis, or marble bone disease, is a rare genetic skeletal disorder caused by defective osteoclasts. This condition increases susceptibility to infections and fractures, highlighting the need for diligent oral and general health maintenance.

Keywords:

autosomal recessive dense sclerotic bone marble bone disease osteopetrosis

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Area of Science:

Skeletal biology
Genetic disorders
Osteoclast biology

Background:

Osteopetrosis, also known as marble bone disease, is a rare inherited skeletal disorder.
It results from defective osteoclast function, impacting bone remodeling and density.
The condition has both autosomal dominant and autosomal recessive inheritance patterns.

Observation:

Defective osteoclasts in osteopetrosis lead to decreased bone vascularity.
This reduced vascularity makes the bones more susceptible to infections like osteomyelitis.
Patients with osteopetrosis are at higher risk for frequent fractures.

Findings:

This case report details the clinical and radiographic findings associated with marble bone disease.
It emphasizes the characteristic signs and symptoms of the disorder.
The report underscores the link between osteoclast dysfunction and skeletal fragility.

Implications:

Healthcare professionals must stress the importance of oral and general health maintenance for osteopetrosis patients.
Early recognition and management are crucial due to increased risks of infection and fractures.
Understanding the pathophysiology aids in patient counseling and care strategies.