Figure 4a. (a) Coronal short inversion time inversion recovery (repetition time msec/echo time msec/inversion time msec, 5300/25/170) image obtained after autologous chondrocyte implantation in a 39-year-old man shows signal intensity characteristic of edema in the marrow adjacent to the site of cartilage repair at the right femoral condyle (arrow). F = femur, T = tibia. (b) Arthroscopic image obtained after implantation shows a healed ulcer with fibrillation at the graft site (
) but does not depict the change in marrow signal intensity found at MR imaging.