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Fig. 11B —MR images from delayed gadolinium-enhanced MR imaging of cartilage study of knee of 41-year-old man after treatment of cartilage defect of medial femoral condyle with autologous chondrocyte implantation (ACI). Color-encoded T1 map of cartilage obtained from set of 7 STIR images with inversion times ranging from 50 to 1,650 msec is superimposed on gray-scale image of knee. T1 value of repair tissue (arrowheads) in ACI site is 83% of that of adjacent, native articular cartilage of medial femoral condyle, indicating slightly lower concentration of glycosaminoglycans within repair tissue. Lower T1 values within superficial articular cartilage of medial femoral condyle and tibial plateaus indicate loss of glycosaminoglycans.