Delivery of agents into articular cartilage by laser-ultrasound

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Presentation transcript:

Delivery of agents into articular cartilage by laser-ultrasound H.J. Nieminen, A. García-Pérez, M.A. Finnilä, A. Salmi, S. Ranjan, S. Saarakkala, K.P. Pritzker, E. Hæggström Osteoarthritis and Cartilage Volume 24, Pages S523-S524 (April 2016) DOI: 10.1016/j.joca.2016.01.957 Copyright © 2016 Terms and Conditions

Figure 1A. Photograph of treated sample quadrants. B-E Figure 1A. Photograph of treated sample quadrants. B-E. Napierian optical absorbance images of articular cartilage (AC) samples (B-E) exposed to methylene blue (MB). The blue contrast in photograph and absorbance in AC sections were greater in T1 (black arrows) as compared to C1 and C2 (magenta arrows). Based on results ultrasound can deliver MB into AC. No difference in absorbance was observed between C1 and C2. This suggests that ultrasound treatment does not modify permeability of AC. Osteoarthritis and Cartilage 2016 24, S523-S524DOI: (10.1016/j.joca.2016.01.957) Copyright © 2016 Terms and Conditions

Figure 2. Depth-wise optical absorbance (mean ± 95% CI), representing methylene blue (MB) content, was statistically significantly greater up to a depth 400–500 μm in T1 compared to C1 and C2. The result suggests that laser-ultrasound can deliver MB into AC. Osteoarthritis and Cartilage 2016 24, S523-S524DOI: (10.1016/j.joca.2016.01.957) Copyright © 2016 Terms and Conditions

Figure 3. Safranin-O -stained articular cartilage (AC) sections (A-B, Control, n = 6) showed no differences in superficial fibrillation or in fixed charge density (red contrast, binds stoichiometrically to proteoglycan) as compared to sections from adjacent AC tissue exposed to laser-ultrasound (LU) (C-D, treatment, n = 6). Similarly, field emission scanning electron imaging (FESEM) revealed no structural damage to the AC surface when comparing control samples (E-F, n = 6) to treatment samples (G-H, n = 6). Based on results, the applied LU does neither cause structural damage to AC nor induce proteoglycan depletion. Osteoarthritis and Cartilage 2016 24, S523-S524DOI: (10.1016/j.joca.2016.01.957) Copyright © 2016 Terms and Conditions