MgAl-Layered Double Hydroxide-Modified Bioceramic Scaffolds for the Potential Application in Osteochondral Defect...

Area of Science:

• Biomaterials Engineering
• Regenerative Medicine
• Orthopedic Research

Background:

• Articular cartilage and subchondral bone defects present complex repair challenges due to differing biological and mechanical properties.
• Current strategies often fail to address both tissues simultaneously, hindering integrated repair.
• Developing a unified approach for regenerating both bone and cartilage is a critical clinical need.

Purpose of the Study:

• To engineer a novel 3D-printed composite scaffold for simultaneous articular cartilage and subchondral bone defect repair.
• To investigate the efficacy of MgAl-layered double hydroxide (MgAl-LDH) modified β-tricalcium phosphate (β-TCP) scaffolds in promoting osteogenesis and chondrogenesis.
• To evaluate the biocompatibility and cellular response of the composite scaffold with relevant stem cells and chondrocytes.

Main Methods:

• Synthesis of MgAl-LDH nanosheets via hydrothermal method.
• Modification of β-TCP scaffolds with MgAl-LDH using 3D printing and surface modification techniques.
• Characterization of scaffold microstructure, mechanical strength, and biocompatibility.
• In vitro assessment of cell proliferation, attachment, osteogenic differentiation of rabbit bone marrow mesenchymal stem cells (rBMSCs), and chondrocyte metabolism.

Main Results:

• The composite scaffolds (MgAl-LDHs-TCP) demonstrated uniform microstructure, adequate compressive strength, and good biocompatibility.
• Scaffolds effectively supported the proliferation and attachment of rBMSCs and chondrocytes.
• The 72MgAl-LDHs-TCP scaffolds significantly promoted osteogenic differentiation in rBMSCs, including alkaline phosphatase induction and calcium deposition.
• Composite scaffolds enhanced chondrocyte synthetic metabolism and inhibited catabolic gene expression, indicating a protective effect on chondrocytes.

Conclusions:

• The developed 3D-printed MgAl-LDHs-TCP composite scaffolds show significant potential for simultaneous regeneration of both cartilage and subchondral bone defects.
• The release of bioactive ions from the composite material plays a crucial role in modulating cellular behavior for enhanced bone and cartilage repair.
• This novel scaffold represents a promising therapeutic strategy for complex orthopedic injuries involving both bone and cartilage.