Does Metal Transfer Differ on Retrieved Ceramic and CoCr Femoral Heads?

Figure 1

Procedure for analyzing metal transfer damage on a ceramic femoral head. (a) Initial photo documentation of a ceramic femoral head with metal transfer damage. (b) Photo documentation with grayscale enhancement applied. (c) Canny edge detection defining the edges of the metal transfer. (d) Pixel segmentation isolating metal transfer from the femoral head for the upper hemisphere, expanded to full metal transfer surface area using a Nearest-Neighbor growing algorithm. (e) Reverse azimuthal projection producing a weighted two-dimensional image of the total upper hemisphere featuring metal transfer, and the percent coverage. (f) An equivalent 3D representation of the isolated metal transfer.