For partial CR stifles (Fig 3B), the following factors were significantly correlated with Histologic Synovitis Grade: Arthroscopic Synovitis Score (SR = 0.43, P = 0.02), CrCL FSE Grayscale (SR = 0.50, P = 0.007, Fig 4A), Histologic Synovitis VAS (SR = 0.79, P<0.0001), CD3+ T lymphocyte Grade (SR = 0.38, P = 0.05), TRAP+ Macrophage Grade (SR = 0.46, P = 0.015), and Synovial:Serum CRP (SR = 0.42, P = 0.027, Fig 4B). This evidence concerns the gene CRP and synovitis.