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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.
