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Fig. 4 Scanning electron microscope image (×1500) of a femoral head-neck junction that had been in vivo for sixteen months, demonstrating marked pitting corrosion of a cobalt-chromium femoral neck that was mated with a ceramic head (Case 6). Femoral head-neck corrosion was found in six of the ten implants analyzed (five with ceramic heads, and one with a metal head).
