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Related Concept Videos

Skeleton and Calcium Homeostasis01:21

Skeleton and Calcium Homeostasis

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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.
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Hormones and Bone Tissue01:17

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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...
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Fractures: Bone Repair01:27

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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...
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Bone Remodeling01:40

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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.
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Osteoclasts in Bone Remodeling01:31

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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...
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Bone Disorders01:29

Bone Disorders

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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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Related Experiment Video

Updated: Apr 29, 2026

A Mini-Invasive Internal Fixation Technique for Studying Immobilization-Induced Knee Flexion Contracture in Rats
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A Mini-Invasive Internal Fixation Technique for Studying Immobilization-Induced Knee Flexion Contracture in Rats

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Immobilization hypercalcemia associated with multiple trauma.

A Scheller, O Crothers

    Orthopedics
    |May 15, 2014
    PubMed
    Summary
    This summary is machine-generated.

    Immobilization hypercalcemia is a rare condition presenting with nonspecific symptoms like anorexia and nausea in young patients with fractures. Early diagnosis and treatment, including mobilization, are crucial for recovery.

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    Direct Mouse Trauma/Burn Model of Heterotopic Ossification
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    Area of Science:

    • Medical Science
    • Clinical Medicine
    • Pediatric Medicine

    Background:

    • Immobilization following trauma can lead to hypercalcemia, a condition with nonspecific and varied symptoms.
    • This abstract details three young patients who developed hypercalcemia during immobilization after sustaining multiple injuries, including femoral fractures.

    Discussion:

    • The syndrome presented with persistent anorexia and nausea, with gastrointestinal symptoms appearing within two weeks of immobilization.
    • Diagnosis was delayed by a month, highlighting the challenge of recognizing this condition due to its protean manifestations.
    • Treatment involved decreased calcium intake, saline infusion, phosphates, and mobilization, with mobilization proving to be the definitive treatment.

    Key Insights:

    • Hypercalcemia in immobilized trauma patients requires careful evaluation due to its nonspecific and protean symptoms.
    • Prompt recognition and management, particularly through mobilization, are essential for alleviating symptoms and achieving recovery.
    • The study emphasizes the importance of considering hypercalcemia in the differential diagnosis of anorexia and nausea in immobilized patients.

    Outlook:

    • Further research into the mechanisms and early detection of immobilization hypercalcemia is warranted.
    • Developing standardized diagnostic criteria and treatment protocols for this rare syndrome could improve patient outcomes.
    • Increased awareness among clinicians regarding the nonspecific manifestations of hypercalcemia in immobilized trauma patients is crucial.