title: Phase transformation of a zirconia ceramic head after total hip arthroplasty.
abstract: We report two cases of surface deterioration of a zirconia ceramic femoral head associated with phase transformation after total hip arthroplasty. One head was retrieved at revision due to recurrent dislocation after six years and the other because of failure of the locking mechanism of the polyethylene liner after three years. The monoclinic content of the zirconia ceramics rose from 1% to about 30% on the surface of the heads. SEM revealed numerous craters indicating extraction of the zirconia ceramics at the surface. Surface roughness increased from an initial value of 0.006 microm up to 0.12 microm. This is the first report to show that phase transformation of zirconia ceramics causes deterioration of the surface roughness of the head in vivo after total hip arthroplasty.
authors.affiliation: Department of Orthopaedic Surgery, Osaka University Medical School, Suita, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Haraguchi
authors.forename: N
authors.initials: N
authors.lastname: Sugano
authors.forename: T
authors.initials: T
authors.lastname: Nishii
authors.forename: H
authors.initials: H
authors.lastname: Miki
authors.forename: K
authors.initials: K
authors.lastname: Oka
authors.forename: H
authors.initials: H
authors.lastname: Yoshikawa
mesh_terms: D005260:Female; D005270:Femur Head; D006622:Hip Prosthesis; D006801:Humans; D008297:Male; D016876:Metal Ceramic Alloys; D008855:Microscopy, Electron, Scanning; D008875:Middle Aged; D011474:Prosthesis Design; D011475:Prosthesis Failure; D013499:Surface Properties; D015040:Zirconium
chemical_list: D016876:Metal Ceramic Alloys; D015040:Zirconium; C028541:zirconium oxide