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Fig. 8E —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. Oblique coronal T1-weighted spin-echo fat-saturated image (650/12) of knee obtained in plane orthogonal to trochlear ACI site shows area of native articular cartilage thinning (arrow) medial to ACI repair site (arrowheads). Region of native cartilage thinning is poorly shown on transaxial image (D) because of partial-volume artifact.