Evaluation of Engineered Cartilage Composition and Function Using Raman Spectroscopy.

Area of Science:

• Biomedical Engineering
• Spectroscopy
• Regenerative Medicine

Background:

• Tissue-engineered cartilage (TEC) development requires methods to monitor composition and mechanical properties.
• Raman spectroscopy offers a non-destructive technique to analyze biochemical composition.

Purpose of the Study:

• To develop and validate a Raman spectroscopy-based platform for monitoring TEC composition.
• To correlate spectroscopic biomarkers with extracellular matrix (ECM) constituents and mechanical properties.

Main Methods:

• An arthroscopy-compatible Raman probe was used to acquire spectra from TEC constructs.
• Multivariate linear decomposition extracted regression coefficient biomarkers for ECM constituents (sGAG, collagen, water) and scaffold material.
• Raman acquisitions were performed during in vitro cultivation and analyzed for construct variability.

Main Results:

• Raman spectroscopy did not affect chondrocyte growth in seeded-agarose constructs.
• Raman-derived ECM biomarkers accurately reflected sGAG, collagen, and water content, explaining up to 90% of variation.
• Biomarkers correlated strongly with construct stiffness (up to 94% variation explained).
• Donor chondrocyte variability influenced ECM composition and stiffness, with biomarkers accounting for significant variation.

Conclusions:

• The Raman spectroscopy platform enables non-destructive monitoring of TEC composition and mechanical properties.
• This technology can optimize construct fabrication and improve preclinical evaluation for cartilage regenerative therapies.