Correlation analysis of arthritis assessment by 18 F-fluoride and μCT imaging. (A) Correlation analysis of quantitative 18 F-fluoride positron emission tomography/computed tomography (PET/CT) hindpaw measurements and semiquantitative macroscopic scoring of paws at different stages of glucose-6-phosphate isomerase (G6PI)–induced arthritis demonstrated a significant correlation of both parameters. SUV, Standardized uptake value. (B) Quantitative assessment of 18 F-fluoride paw uptake PET and the sum of surface of metatarsal bones 1 to 5 according to μCT data were significantly correlated (n = 60 paws). *P < 0.05, **P < 0.01, ***P < 0.001.