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Related Concept Videos

The Bone Matrix01:18

The Bone Matrix

4.1K
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...
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Essential Minerals for Bone Health01:31

Essential Minerals for Bone Health

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The minerals contained in all of the food we consume are essential for our organ systems. However, certain essential minerals, such as calcium, phosphorus, magnesium, manganese, and fluoride, largely affect bone health.
Calcium and Phosphorus
Calcium is a critical component of bones, especially in the form of calcium phosphate and calcium carbonate. Since the body cannot make calcium, it must be obtained from the diet. However, calcium cannot be absorbed from the small intestine without...
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Bone Remodeling01:40

Bone Remodeling

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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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Spongy Bone01:09

Spongy Bone

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All bones comprise an outer layer of compact bone, and an interior made up of spongy bone tissue, also called cancellous or trabecular bone. In long bones, spongy bone tissue is mainly found in the interior of the epiphyses (broad ends of the bone).
Spongy bone is more porous, and less dense compared to compact bone. It is composed of concentric lamellae that are arranged irregularly to form the trabecular network. In some bones, the spaces between trabeculae contain red marrow, where...
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Bone as Supporting Connective Tissue01:23

Bone as Supporting Connective Tissue

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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—...
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Related Experiment Video

Updated: Aug 18, 2025

Synthesis of Graphene-Hydroxyapatite Nanocomposites for Potential Use in Bone Tissue Engineering
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Frontiers of Hydroxyapatite Composites in Bionic Bone Tissue Engineering.

Jingcun Shi1,2,3, Wufei Dai4,5, Anand Gupta6

  • 1Department of Oral and Maxillofacial Surgery-Head & Neck Oncology, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200011, China.

Materials (Basel, Switzerland)
|December 11, 2022
PubMed
Summary

Tissue-engineered bone using hydroxyapatite (HA) composites offers a superior alternative to autologous bone grafts for repairing bone defects. Advances in HA composites enhance bone regeneration, guiding new bone formation for improved patient outcomes.

Keywords:
bone defect repaircompositescompound scaffoldshydroxyapatitetissue-engineered bone

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Area of Science:

  • Biomaterials Science
  • Regenerative Medicine
  • Orthopedic Engineering

Background:

  • Bone defects significantly impair quality of life, with autologous bone grafting presenting limitations like donor site morbidity and limited volume.
  • Tissue-engineered bone presents a promising alternative for bone defect repair and functional recovery.
  • Hydroxyapatite (HA) composites are key scaffolding materials in tissue-engineered bone, offering biocompatibility and guiding bone regeneration.

Purpose of the Study:

  • To review the advancements in hydroxyapatite (HA) composite scaffolds for tissue-engineered bone.
  • To highlight the critical role of scaffold properties in promoting osteogenesis and functional recovery.
  • To discuss the future potential of biomimetic tissue-engineered bone.

Main Methods:

  • Review of current literature on HA composite scaffolds for bone regeneration.
  • Analysis of material science and manufacturing technology advancements impacting HA composites.
  • Evaluation of scaffold properties such as composition, mechanical strength, surface morphology, pore size, and degradation rate.

Main Results:

  • HA composite scaffolds have significantly improved in composition, mechanical properties, and degradation profiles, closely mimicking natural bone.
  • Scaffold surface morphology and pore diameter are crucial for cell activity and nutrient transport.
  • Matching scaffold degradation rate with osteogenesis and incorporating cells/cytokines enhance new bone formation.

Conclusions:

  • Significant breakthroughs in HA composite development have been achieved, improving their suitability for bone tissue engineering.
  • Biomimetic tissue-engineered bone strategies incorporating vascularization and innervation show considerable promise for future applications.
  • Optimized HA composite scaffolds represent a viable and advanced solution for bone defect repair.