Fig. 1From: Cartilage in facet joints of patients with ankylosing spondylitis (AS) shows signs of cartilage degeneration rather than chondrocyte hypertrophy: implications for joint remodeling in ASNo increased percentage of hypertrophic chondrocytes expressing Runx2, COL10 or MMP13 within the hyaline articular cartilage in ankylosing spondylitis facet joints. The percentage of positively stained chondrocytes among all chondrocytes [%] and representative immunohistochemical staining of Runx2 (a), COL10 (b), MMP13 (c) and osteocalcin (d) within the hyaline articular cartilage of facet joints from controls (CO; A–D upper pictures), patients with ankylosing spondylitis (AS; A–D middle pictures) and osteoarthritis (OA; A–D lower pictures); original magnification 40× and 400×; ns = not significant p >0.05; ***= p <0.001; **= p <0.01, *= p <0.05. COL10 type X collagen, MMP matrix metalloproteinase, Runx2, runt-related transcription factor 2Back to article page