Vol.18 No.6

Case Report

Phase transformation of a new generation yttria-stabilized zirconia femoral head after total hip arthroplasty

Authors

Yasuhisa Hayaishi1 , Hidenobu Miki2 , Hideki Yoshikawa3 , Nobuhiko Sugano3

  • Department of Orthopedic Surgery, Gracia Hospital, 6-14-1 Aomadani-Nishi, Minoo, 562-8567, Japan
  • Department of Orthopedic Surgery, Osaka National Hospital, 2-1-14 Hoenzaka, Chuo-ku, Osaka, 540-0006, Japan
  • Department of Orthopaedic Surgery, Osaka University Graduate School of Medicine, 2-2 Yamadaoka, Suita, 565-0871, Japan
Received:

16 April 2008

Accepted:

1 July 2008

Published online:

26 July 2008

Full Text

PDF　(member's only)

Abstract

We examined a new-generation yttria-stabilized zirconia head manufactured by NGK 1 year after total hip arthroplasty. Monoclinic content of the retrieved head was twice that of the unused head at the pole and equator. A fourfold increase in monoclinic content was observed at 5 mm below the equator. Transformation from the tetragonal phase to the monoclinic phase occurred in the new generation zirconia with alumina doping within a relatively short period in vivo.

Key words

Ceramic head - Phase transformation - Polyethylene wear - Total hip arthroplasty - Zirconia