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Histologic appearance of grafts in the trochlear groove at 4 weeks postoperatively in the TSA and control groups. (b) shows a magnified view of the part area in (a). (c) shows the gap between the grafted and adjacent cartilage tissues in (a). (e) shows a magnified view of the part area in (d). (f) shows the gap between the grafted and adjacent cartilage tissues in (d) (red arrows indicate the gap between the graft and the adjacent cartilage tissues).
