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Fig. 8B —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. Sagittal proton density-weighted fast spin-echo
image (TR/TE, 2,400/37; echo-train length, 8) of knee shows complete fill of
trochlear ACI site (arrowheads) by repair tissue, which appears
slightly darker than native articular cartilage. Levels of articular surface
and subchondral bone plate are slightly above those of adjacent, nonoperated
regions.
