Fig. 4

a Forest plots illustrating individual and pooled SMD for differences in T1rho and T2 relaxation time of patellar articular cartilage between healthy controls and participants at risk for knee OA. SMD = standardized mean difference, 95% CI = 95% confidence interval, ACL = anterior cruciate ligament, ICRS=International Cartilage Repair Society, OAI=Osteoarthritis Initiative, OA = osteoarthritis, GE = General Electric, T = Tesla. b Forest plots illustrating individual and pooled SMD for differences in T1rho and T2 relaxation time of trochlear articular cartilage between healthy controls and participants at risk for knee OA. SMD = standardized mean difference, 95% CI = 95% confidence interval, ACL = anterior cruciate ligament, ICRS=International Cartilage Repair Society, OAI=Osteoarthritis Initiative, OA = osteoarthritis, GE = General Electric, T = Tesla