Progress on rotator cuff tendon-to-bone interface tissue regeneration and repair

Area of Science:

• Biomaterials Science
• Regenerative Medicine
• Musculoskeletal Research

Background:

• Tendon-bone interface (TBI) injuries, like rotator cuff tears, are common and heal poorly due to hypoxia, oxidative stress, and fatty infiltration.
• Natural healing fails to restore the native four-zone gradient architecture, leading to scar tissue and reduced mechanical function.
• Surgical repair alone cannot fully recreate the complex TBI structure, necessitating advanced regenerative approaches.

Purpose of the Study:

• To review the challenges and complexities of TBI injuries and their treatment.
• To summarize current tissue-engineered regenerative strategies for TBI repair.
• To highlight future directions for improving TBI regeneration.

Main Methods:

• Scaffolds utilizing hydrogels, decellularized matrices, polymers, collagen, and nanoparticles are fabricated.
• Scaffolds are engineered with graded architectures, aligned structures, mineralization cues, and tailored interfacial properties.
• Active components like stem cells, exosomes, and bioactive factors are incorporated to enhance the regenerative microenvironment.

Main Results:

• Tissue-engineered strategies aim to recreate a 3D microenvironment supporting regeneration, reducing inflammation, and promoting vascularization.
• These methods address limitations of natural healing and surgical repair for rotator cuff injuries.
• Progress has been made in developing functional scaffolds and incorporating active biological components.

Conclusions:

• Tissue engineering presents a viable alternative for rotator cuff repair by mimicking native TBI structure and function.
• Future research should focus on digitally enabled scaffold design, safety assessment, and quantitative efficacy evaluation.
• Translational research is crucial to bridge the gap between laboratory findings and clinical application for TBI regeneration.