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Related Concept Videos

Bone Remodeling01:40

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.
Growth of Cartilage and Bone Tissue01:27

Growth of Cartilage and Bone Tissue

Chondrocytes form a temporary cartilaginous model by dividing and secreting a thick gel-like extracellular matrix. Once the chondrocytes undergo programmed cell death, osteoblasts enter the site of the cartilaginous model. The process of replacing the temporary cartilaginous model with bone in an ordered manner is called endochondral ossification. In endochondral ossification, not all of the cartilage is replaced by bone tissue. Some cartilage that performs a protective and supportive function...
Bone as Supporting Connective Tissue01:23

Bone as Supporting Connective Tissue

Bone tissue forms the internal skeleton of vertebrate animals, providing structure to the body.
Bone Matrix
Bone, or osseous tissue, is a connective tissue that has a large amount of two different types of matrix material. The organic matrix is similar to the matrix material found in other connective tissues, including some amount of collagen and elastic fibers. This gives strength and flexibility to the tissue. The inorganic matrix consists of mineral salts— mostly calcium salts— that give the...
Bone Formation by Intramembranous Ossification01:29

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...
Fractures: Bone Repair01:27

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 procedure...
Bone Remodeling and Repair01:31

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

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Distinctive Capillary Action by Micro-channels in Bone-like Templates can Enhance Recruitment of Cells for Restoration of Large Bony Defect
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Growth Factor-Free Engineered Biphasic Scaffold for Enhanced Bone Regeneration.

Suranji Wijekoon1, Weiwei Wang2, Sama Abdulmalik1

  • 1Department of Growth and Development, Nebraska Translational Research Center (NTRC), College of Dentistry, University of Nebraska Medical Center, Omaha, NE, USA.

Annals of Biomedical Engineering
|September 25, 2025
PubMed
Summary
This summary is machine-generated.

This study developed a biphasic scaffold for bone regeneration, using decellularized extracellular matrix (dECM) to enhance healing in large bone defects. The novel biomaterial achieved complete defect bridging and improved bone quality in animal models.

Keywords:
Biphasic scaffoldBone regenerationCalcium phosphate (CaP)ChemoattractantDecellularized extracellular matrix (dECM)Growth factor alternativeNanofibersOsteoinduction

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Area of Science:

  • Biomaterials Science
  • Regenerative Medicine
  • Orthopedic Surgery

Background:

  • Large-area bone regeneration is challenging due to incomplete mineralization of current grafts.
  • Existing bone grafts often fail to regenerate the entire defect, particularly in the core.

Purpose of the Study:

  • To introduce a biphasic, biomimetic scaffold for uniform bone regeneration in large defects.
  • To combine structural support with enhanced bioactivity for improved osteogenesis and mineralization.

Main Methods:

  • Fabrication of a biphasic scaffold with a porous outer tube and a nanofiber core enriched with decellularized extracellular matrix (dECM).
  • Screening of 25 dECMs derived from co-cultures of osteoblasts, chondrocytes, mesenchymal stromal cells, fibroblasts, and endothelial cells.
  • Optimization of nanofiber core properties and evaluation of scaffold porosity and mechanical strength.
  • In vivo testing in a 10 mm critical-sized femoral defect in rats, assessing bone healing via imaging and histology.

Main Results:

  • Osteoblast + Mesenchymal Stromal Cell (OB+MSC)-derived dECM demonstrated the highest osteogenic potential.
  • The optimized scaffold exhibited suitable porosity (89.6%) and compressive modulus (123 MPa).
  • Scaffolds with CaP and OB+MSC dECM significantly enhanced bone healing, showing a twofold increase in bone volume, mineral density, and cortical bone formation.
  • Regenerated bone exhibited a threefold higher compressive modulus than controls and autografts, achieving complete defect bridging by 12 weeks.

Conclusions:

  • The biphasic scaffold design effectively promotes uniform bone regeneration in large defects.
  • Integrating osteoinductive dECM with structural support offers a promising strategy for clinical translation in bone repair.
  • This biomimetic approach overcomes limitations of current bone grafts, enabling complete structural and functional recovery.