Bone formation beyond the skeletal envelope using calcium phosphate granules packed into a collagen pouch-a pilot
Claire Guillet1, Ulrik Birgersson2,3, Thomas Engstrand4
1Department of Small Animal Emergency and Critical Care, Department of Clinical Veterinary Medicine, Vetsuisse Faculty, University of Bern, Bern, Switzerland.
Biomedical Materials (Bristol, England)
|March 17, 2023
Summary
This study shows a collagen pouch filled with calcium phosphate granules can create new bone beyond the skeleton. Macrophages, not osteoclasts, aided bone formation, offering new options for bone repair.
Area of Science:
- Regenerative Medicine
- Biomaterials Science
- Skeletal Biology
Background:
- Bone defects present significant challenges in craniofacial reconstruction.
- Current bone grafting techniques have limitations, including donor site morbidity and limited supply.
Purpose of the Study:
- To investigate the potential of a collagen-calcium phosphate (CaP) construct for ectopic bone neoformation.
- To evaluate the bone regeneration capacity beyond the native skeletal envelope.
Main Methods:
- A proof-of-concept study using a collagen pouch containing CaP granules implanted over the frontal bone of sheep.
- Macroscopic and histological analysis at 13 weeks post-implantation.
Main Results:
- Significant woven bone formation within the collagen pouch, integrating with the recipient bone.
- Bridging bone formation observed between the implant and the native frontal bone.
- Presence of osteoblasts, macrophages, and inflammatory cells within the implant site; macrophages appeared to mediate CaP resorption.
Conclusions:
- A collagen sleeve containing CaP granules effectively promotes bone neoformation beyond the skeletal envelope.
- This approach demonstrates potential for bone augmentation and reconstruction of craniofacial defects.
- Macrophages play a key role in the resorption and remodeling of CaP granules into new bone in this model.
More Related Videos
09:35Distinctive Capillary Action by Micro-channels in Bone-like Templates can Enhance Recruitment of Cells for Restoration of Large Bony Defect
Published on: September 11, 2015
9.8K
06:05Author Spotlight: Enhancing Bone Regeneration with Vascularized Artificial Cartilage Integration
Published on: July 14, 2023
1.1K
Related Concept Videos
01:18The Bone Matrix
3.3K
Bone contains a relatively small number of cells entrenched in a matrix of collagen fibers that provide an adherent surface for inorganic salt crystals. Both components of the matrix, organic and inorganic, contribute to the unusual properties of bone. Without collagen, bones would be brittle and shatter easily. Without mineral crystals, bones would flex and provide little support. This can be observed by an experiment: when the minerals of a bone are dissolved by soaking the bone in...
3.3K
01:40Bone Remodeling
38.4K
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.
38.4K
01:24Bone Formation by Endochondral Ossification
4.9K
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...
4.9K
01:29Bone Formation by Intramembranous Ossification
6.6K
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 ...
The process begins when mesenchymal cells in the embryonic skeleton gather together and differentiate into osteogenic cells, which then develop into ...
6.6K
01:27Growth of Cartilage and Bone Tissue
3.4K
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...
3.4K
01:23Bone as Supporting Connective Tissue
3.6K
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—...
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—...
3.6K