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Case no. 2. There were cartilage defects (arrowhead) in the lateral condyle of the left femur (a, d). One year after operation, the thickness of the graft area was less than 50 % of that of normal cartilage (arrowhead) (b, e). At 6.6 years post-implantation, the signal intensity at the implanted site was almost the same (arrowhead) as that of surrounding normal cartilage (c, f)
