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Fig. 11A —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). Coronal STIR fast spin-echo MR image (TR/TE, 1,800/14; inversion time, 1,650 msec; echo-train length, 7) of knee obtained 2 hr after IV injection of 0.2 mmol of gadopentetate dimeglumine per kilogram of body weight shows complete fill of ACI site (arrowheads) on medial femoral condyle. Surface of repair site is slightly irregular. Signal intensity of superficial layer of articular cartilage of medial tibial plateau appears mildly frayed.