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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...

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...

Bone Remodeling and Repair

Bone Remodeling and Repair

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...

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Related Experiment Video

Updated: May 28, 2026

Osteoclast Derivation from Mouse Bone Marrow

Osteoclast Derivation from Mouse Bone Marrow

Published on: November 6, 2014

Bone healing and osteoporosis.

Umberto Tarantino¹, Irene Cerocchi, Alessandro Scialdoni

¹Orthopaedics and Traumatology, PTV Foundation, University of Tor Vergata, Rome, Italy. umberto.tarantino@uniroma2.it

Aging Clinical and Experimental Research

|October 6, 2011

Summary

Fracture healing requires a balance of biomechanical, molecular, and cellular factors. Optimal healing depends on adequate blood supply, fragment contact, stability, and appropriate surgical implants, especially in osteoporosis.

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A Novel in vivo Gene Transfer Technique and in vitro Cell Based Assays for the Study of Bone Loss in Musculoskeletal Disorders

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Published on: June 8, 2014

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Last Updated: May 28, 2026

Osteoclast Derivation from Mouse Bone Marrow

Osteoclast Derivation from Mouse Bone Marrow

Published on: November 6, 2014

A Novel in vivo Gene Transfer Technique and in vitro Cell Based Assays for the Study of Bone Loss in Musculoskeletal Disorders

A Novel in vivo Gene Transfer Technique and in vitro Cell Based Assays for the Study of Bone Loss in Musculoskeletal Disorders

Published on: June 8, 2014

Area of Science:

Orthopedics
Biomaterials Science
Cellular Biology

Background:

Fracture healing is a complex biological process involving inflammation, cell proliferation, and tissue remodeling.
The initial fracture hematoma is crucial for initiating the inflammatory cascade essential for bone repair.
Mesenchymal stem cell activation and growth factor release are key molecular events in fracture healing.

Purpose of the Study:

To elucidate the critical factors influencing successful fracture healing.
To highlight the impact of biomechanical, molecular, and cellular elements on bone repair.
To discuss the role of surgical implants and the challenges posed by osteoporosis.

Main Methods:

Review of current literature on fracture healing mechanisms.
Analysis of factors affecting bone repair efficacy.
Examination of the influence of osteoporosis on fracture healing.

Main Results:

Successful fracture healing necessitates a synergistic interplay of biomechanical, molecular, and cellular signals.
Adequate blood supply, bone fragment contact, and stability are critical for optimal outcomes.
Implant selection significantly impacts fracture healing, particularly in compromised bone states like osteoporosis.

Conclusions:

Fracture healing is a multifactorial process influenced by biological and mechanical conditions.
Osteoporosis significantly impairs bone healing capacity due to cellular and tissue quality degradation.
Further research into optimizing fracture healing strategies, especially in osteoporotic patients, is warranted.