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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...

Development of the Limb Synovial Joints

Development of the Limb Synovial Joints

Joints form during embryonic development in conjunction with the formation and growth of the associated bones. The embryonic tissue that gives rise to all bones, cartilage, and connective tissues of the body is called mesenchyme.
The mesenchymal stem cells differentiate into chondrocytes that form the hyaline cartilage, and later the cartilaginous model of the bone. This model further transforms into a bone. This process is known as endochondral ossification.
During development, the limbs...

Bone Formation by Intramembranous Ossification

Bone Formation by Intramembranous Ossification

Intramembranous ossification is one of the two processes involved in the development of bones within an embryo. The flat bones of the face, most of the cranial bones, and the clavicles are formed via this process. During intramembranous ossification, the bones develop directly from sheets of undifferentiated mesenchymal connective tissue.
The process begins when mesenchymal cells in the embryonic skeleton gather together and differentiate into osteogenic cells, which then develop into ...

Bone Formation by Endochondral Ossification

Bone Formation by Endochondral Ossification

Bone formation, or ossification, begins around the sixth to seventh week of embryonic development. Most bones develop from a cartilaginous template through the process of endochondral ossification. Cartilage formation begins when clusters of mesenchymal cells differentiate into chondrocytes. These chondrocytes proliferate rapidly and secrete an extracellular matrix that becomes encased in a membrane called the perichondrium. The resulting cartilage model provides a template that resembles the...

Fractures: Bone Repair

Fractures: Bone Repair

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...

Introduction to Joints

Introduction to Joints

The adult human body usually has 206 bones, and except for the hyoid bone in the neck, each bone is connected to at least one other bone. Joints are the location where bones come together. Many joints allow for movement between the bones. At these joints, the articulating surfaces of the adjacent bones can move smoothly against each other. However, the bones of other joints may be joined by connective tissue or cartilage. These joints are designed for stability and provide little or no...

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Related Experiment Video

Updated: Dec 4, 2025

Standardized Histomorphometric Evaluation of Osteoarthritis in a Surgical Mouse Model

Standardized Histomorphometric Evaluation of Osteoarthritis in a Surgical Mouse Model

Published on: May 6, 2020

A hypothesis of bone joint defects.

D S Robertson¹

¹205, Pickersleigh Road, Malvern, Worcestershire WR14 2QS, England.

Medical Hypotheses

|October 25, 2020

Summary

This summary is machine-generated.

This study explores the biochemical origins of joint changes in arthritis, including rheumatoid arthritis and osteoarthritis. It identifies performic acid as a new cause of joint tissue degradation and suggests control methods.

Keywords:

Formic acid Hydrogen peroxide Hyroxylamine Lactic acid Performic acid Uric acid

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Last Updated: Dec 4, 2025

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Area of Science:

Biochemistry
Rheumatology
Cell Biology

Background:

Joint changes are characteristic of rheumatoid arthritis, osteoarthritis, and arthritis urica.
Existing research lacks a unified explanation for these diverse observations.

Purpose of the Study:

To propose biochemical origins for joint changes in various arthritis types.
To explain the link between rheumatoid arthritis and anemia.
To identify novel causes of joint tissue degradation.

Main Methods:

Analysis of cell reactions involving four basic cell biochemicals.
Investigating the role of performic acid in joint tissue degradation.

Main Results:

Alterations in cell biochemical reactions are proposed as the origin of joint changes.
Performic acid is identified as a previously unrecognized cause of joint tissue degradation.
The proposed model explains the connection between rheumatoid arthritis and anemia.

Conclusions:

Cellular biochemical alterations drive joint pathology in arthritis.
Performic acid represents a new target for understanding and potentially treating joint degradation.
Control strategies for arthritis-related joint changes can be developed based on these findings.