Histological images of the device/bone interfaces at 4, 8 and 12 weeks after surgery. (a, c, e) Ca–P coated porous device. (b, d, f) Sr–P coated porous device. White arrows indicate the implanted device and black arrow indicate the bone end. In each panel, an enlargement of the area enclosed in a black square in the left image is shown on the right to present the new bone tissues. The yellow arrows indicate chondrocytes, which was stained blue. While red arrows indicate bone and matrix, which was stained red and mark with label red. (For interpretation of the references to color in this figure legend, the reader is referred to the Web version of this article.)