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Fig. 8D —52-year-old man with failed abrasion arthroplasty of medial trochlea who was treated by autologous chondrocyte implantation (ACI). Six years after surgery, he was asymptomatic and underwent imaging with IV (indirect) MRI arthrography. Transaxial proton density-weighted fast spin-echo image (3,625/30; echo-train length, 12) of knee shows ACI site (arrowheads) on medial trochlear facet filled with low-signal-intensity repair tissue.