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Related Concept Videos

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 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 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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Related Experiment Video

Updated: Oct 27, 2025

Modeling Primary Bone Tumors and Bone Metastasis with Solid Tumor Graft Implantation into Bone
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Cement Intercalary Reconstruction After Bone Tumor Resection.

Jan Lesenský, Andreas F Mavrogenis

    Orthopedics
    |July 22, 2021
    PubMed
    Summary

    Permanent cement spacer reconstruction is a viable option after intercalary tumor resection, offering good outcomes for humerus and femur tumors with low complication rates.

    Area of Science:

    • Orthopedic Oncology
    • Surgical Reconstruction

    Background:

    • Optimal reconstruction after intercalary tumor resection remains debated.
    • Megaprosthetic and biologic reconstructions can be complex, potentially delaying treatment.

    Purpose of the Study:

    • To evaluate the outcomes of permanent cement spacer intercalary reconstruction.
    • To assess survival, function, and complication rates in patients undergoing this procedure.

    Main Methods:

    • Retrospective review of 20 patients with humerus or femur bone tumors.
    • Wide margin resection followed by permanent cement spacer intercalary reconstruction.
    • Evaluation of survival, function (Musculoskeletal Tumor Society score), and complications.

    Main Results:

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    • No infections or complications in humeral reconstructions.
    • Mean Musculoskeletal Tumor Society scores of 85% (humerus) and 82% (femur).
    • Five patients with metastatic disease died with reconstruction in situ; two femoral reconstructions failed mechanically.

    Conclusions:

    • Permanent cement spacer reconstruction is a safe and effective index surgery for intercalary bone tumors.
    • It provides good functional outcomes and can be a definitive treatment option.