Arthroscopic Raman Probe Provides Biomarkers of TMJ Tissue Composition that Account for Tissue Function

Combined glycosaminoglycan and water Raman biomarkers explain 86% of variation in porcine and human condylar indentation modulus, far exceeding Outerbridge grading (4%).

• Why it matters: TMJ surgery decisions currently depend on visual assessment, which cannot quantitatively link tissue composition to mechanical function.
• What they did: An arthroscopy-compatible Raman probe measured condylar cartilage and human articular discs, using Raman-derived GAG, collagen, water, and hydroxyapatite biomarkers compared with indentation and tensile modulus.
• The result: For discs, proline- and water-associated biomarkers explained 88% of tensile modulus variation, and in situ spectra under simulated arthroscopy matched ex vivo quality while imaging showed GAG depletion and cartilage thinning in degenerated condyles.

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