L.N. Nwosu, P.I. Mapp, V. Chapman, D.A. Walsh 

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Relationship between structural pathology and pain behaviour in a model of osteoarthritis (OA)  L.N. Nwosu, P.I. Mapp, V. Chapman, D.A. Walsh  Osteoarthritis and Cartilage  Volume 24, Issue 11, Pages 1910-1917 (November 2016) DOI: 10.1016/j.joca.2016.06.012 Copyright © 2016 The Authors Terms and Conditions

Fig. 1 Effect of MIA on pain behaviour. Intra-articular injection of 1 mg MIA-induced pain behaviour measured as both increased hind-limb WB asymmetry (A and B) and reduced PWT to punctuate stimulation (D and E). Intra-articular injection of 0.1 mg MIA resulted in reduced PWTs (D–F) without significant increases in WB asymmetry (A–C). WB asymmetry was significantly greater following 1 mg MIA than following 0.1 mg MIA (B). Data indicate mean ± 95% confidence interval for n = 10–18 rats per group. Differences between groups were analysed using area under the curve for 0–20 days (B and E) and 24–42 days (C and F) then Kruskal–Wallis test followed by post hoc Dunn's tests. Significance of post hoc tests are denoted by the number of symbols, e.g.,: *: P < 0.05; **: P < 0.01; ***: P < 0.001. Asterisks (*) denote significant differences from saline-injected non-arthritic controls. Plus (+) signs denote significant differences from 0.1 mg MIA injected arthritic rats. Osteoarthritis and Cartilage 2016 24, 1910-1917DOI: (10.1016/j.joca.2016.06.012) Copyright © 2016 The Authors Terms and Conditions

Fig. 2 Evidence of inflammation following OA induction. Small changes in knee diameter were observed after intra-articular injection of MIA or saline, as indicated by differences between injected and contralateral knees (A). Knee diameter differences between injected and non-injected contralateral knees were greater in MIA injected rats compared to the saline-injected rats at day 3 after MIA injection (A). Panels B–E show synovium with H&E stain and FI show synovium with an immunohistochemical (ED1) stain. Synovitis was characterised as synovial lining thickness/cellularity (B–E) and macrophage infiltration (F–I). Extensive synovial hyperplasia (red arrows) was apparent in the d20-1 mg and d42-0.1 mg MIA-induced OA rats (D & E) compared with non-arthritic saline controls (B). Macrophage infiltration (indicate by black staining for immunoreactivity with ED1; FI) was higher for the d20-1 mg and d42-0.1 mg rats (H & I) compared to non-arthritic saline controls (F). Black arrows indicate synovial surface. Photomicrographs show H&E stained sections of synovial tissue from a rat with the median synovitis score from each group. Scale bars = 50 μm. Data indicate mean ± 95% confidence interval for n = 10–18 rats per group. Differences between groups were analysed using Kruskal–Wallis test followed by post hoc Dunn's tests. Significance of post hoc tests are denoted by the number of symbols, e.g.,: *: P < 0.05; **: P < 0.01. Asterisks (*) denote significant differences from saline-injected non-arthritic controls (A). Osteoarthritis and Cartilage 2016 24, 1910-1917DOI: (10.1016/j.joca.2016.06.012) Copyright © 2016 The Authors Terms and Conditions

Fig. 3 Articular cartilage pathology 20 and 42 days after OA induction. Histological images of the tibial plateau (A–D). Joints were sectioned in a frontal plane and stained with Safranin O-Fast green and corresponding consecutive sections stained with H&E. A; saline-treated control showing smooth cartilage and normal joint margin and chondrocyte morphology. B, C; 1 mg and 0.1 mg MIA-injected rats at day 20 and D; 0.1 mg MIA-injected rat at day 42 show degeneration of the cartilage. Proteoglycan loss (B–D) and chondrocyte cloning (B) are also present in the arthritic cartilage. Scale bars = 200 μm. Images are of knees with median cartilage surface integrity scores from each group. Osteoarthritis and Cartilage 2016 24, 1910-1917DOI: (10.1016/j.joca.2016.06.012) Copyright © 2016 The Authors Terms and Conditions