CRP and synovitis: For partial CR stifles (Fig 3B), the following factors were significantly correlated with Histologic Synovitis VAS: Radiographic Effusion (SR = 0.38, P = 0.04), Radiographic OA (SR = 0.47, P = 0.01), Arthroscopic CrCL Fiber Damage VAS (SR = 0.38, P = 0.04), CrCL FSE Grayscale (SR = 0.50, P = 0.006), CrCL T1 Enhance (SR = -0.43, P = 0.02), Histologic Synovitis Grade (SR = 0.79, P<0.0001), TRAP+ Macrophage Grade (SR = 0.50, P = 0.007), and Synovial:Serum CRP (SR = 0.48, P = 0.009).