Correlation between FT-IRIS–derived parameters and MRI T2 relaxation values in repair tissue. (A) T2 relaxation (ms) versus collagen–Am I content in repair tissue, (B) T2 relaxation (ms) versus PG content in repair tissue, and (C) T2 relaxation (ms) versus collagen integrity (new tissue formation) in repair tissue. There were no significant correlations between T2 relaxation times and the FT-IRIS–derived values in repair tissue. ×, TP-508 (6-week repair); □, TP-508 (3-week repair); ▵, placebo (6-week repair); ◊, placebo (3-week repair).