Next-Generation Joint-on-a-Chip: Toward Precision Mechanical Control in Multi-Tissue Systems

Area of Science:

• Biomedical Engineering
• Tissue Engineering
• Osteoarthritis Research

Background:

• Osteoarthritis (OA) is a major cause of global disability with no current disease-modifying therapies.
• Existing in vitro models inadequately represent joint physiology and pathology, impeding research and drug discovery.
• Joint-on-a-chip (JoC) technology presents a promising alternative for simulating joint function and disease.

Purpose of the Study:

• To provide a comprehensive overview of key joint tissues (cartilage, subchondral bone, synovium) and cartilage's load-bearing role.
• To identify critical microenvironmental factors for JoC models.
• To review current JoC technologies, their challenges, and propose solutions for multi-tissue integration and mechanical stimulation.

Main Methods:

• Review of joint tissue structure, function, and biomechanics.
• Analysis of existing joint-on-a-chip technologies and their limitations.
• Conceptual design proposal for an advanced JoC prototype.

Main Results:

• Detailed examination of cartilage, subchondral bone, and synovium structures and functions.
• Identification of essential microenvironmental characteristics for accurate joint simulation.
• Highlighting the challenge of integrating multi-tissue co-culture with mechanical stimulation in current JoC models.

Conclusions:

• Developing a high-performance JoC requires seamless multi-tissue integration and precise mechanical stimulation.
• The proposed JoC conceptual design aims to overcome current limitations.
• Successful JoC development will significantly advance OA mechanism studies and therapeutic strategies.