Serious metallosis of a metal head due to fragmented ceramic screws in a cemented THA |
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Authors: | Hidenobu Miki Nobuhiko Sugano Mitsuyoshi Yamamura Nobuo Nakamura Takashi Nishii Hideki Yoshikawa |
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Institution: | (1) Department of Orthopedic Surgery, Osaka University Graduate School of Medicine, Yamadaoka 2-2, Osaka, Japan;(2) Department of Orthopedic Surgery, Kyowakai Hospital, Kishibekita 1-24-1, Suita, Osaka, Japan |
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Abstract: | We reported a rare revision case necessitated by massive metallosis of a metal head due to a fragmented ceramic screw which
had been extraarticularily used in the primary THA here and reviewed previous literature about metallosis of metal heads associated
with ceramic materials. The ceramic screw had been used for the fixation of a bone graft and reattachment of the greater trochanter
in the primary THA. Scanning electron microscope analysis revealed large alumina ceramic particles embedded on the bearing
surface of the polyethylene. It has previously been pointed out that metallosis of an inner head occurred in bipolar case
due to a fracture of the ceramic screws in contact with a proximally migrated outer head. However, this case showed that if
a ceramic screw fragmented even though it was used outside of the hip joint, the fragments could migrate into bearing surface
and cause serious metallosis of the metal head. Thus, we recommend that surgeons should pay special attention to the radiographic
signs of ceramic failure or metallosis such as a change of the metal head contour, if an aseptic loosening or severe osteolysis
is observed in a THA in which ceramic materials were used near the hip joint. And, when a surgical revision is planned, the
surgeon should be prepared to exchange with a new ceramic head. |
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Keywords: | Ceramic Metallosis Hip Arthroplasty Revision |
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