title: Catastrophic stem taper wear in ceramic on polyethylene bearing couple: a case report.
abstract: A severe abrasion occurred at the stem taper 13 years after total hip arthroplasty. The bearing couple was 28 mm ceramic on polyethylene. The ceramic head had almost no damage, whereas the stem taper had severe damage. An ectopic bone probably contributed to the abrasion. The ectopic bone had grown to restrict the normal motion in the bearing couple and all stress and torque seemed to concentrate in the junction until the junction obtained mobility instead of the original bearing couple.
authors.affiliation: Institute for Joint Replacement and Rheumatology, Ebina General Hospital, Kanagawa, Japan.
authors.forename: Atsushi
authors.initials: A
authors.lastname: Kusaba
authors.affiliation: Department of Orthopaedic Surgery, Showa University Fujigaoka Hospital, Yokohama, Japan.
authors.forename: Mariko
authors.initials: M
authors.lastname: Katsui
authors.affiliation: Department of Orthopaedic Surgery, Showa University Fujigaoka Hospital, Yokohama, Japan.
authors.forename: Naoyuki
authors.initials: N
authors.lastname: Hakuta
authors.affiliation: Department of Orthopaedic Surgery, Showa University Fujigaoka Hospital, Yokohama, Japan.
authors.forename: Masashi
authors.initials: M
authors.lastname: Tsuchida
authors.affiliation: Department of Orthopaedic Surgery, Showa University Fujigaoka Hospital, Yokohama, Japan.
authors.forename: Akihiko
authors.initials: A
authors.lastname: Maeda
authors.affiliation: Institute for Joint Replacement and Rheumatology, Ebina General Hospital, Kanagawa, Japan.
authors.forename: Saiji
authors.initials: S
authors.lastname: Kondo
mesh_terms: D000497:Alloys / Q000737:chemistry; D000537:Aluminum Oxide / Q000737:chemistry; D019644:Arthroplasty, Replacement, Hip / Q000295:instrumentation*; D002516:Ceramics / Q000737:chemistry*; D002828:Choristoma / Q000209:etiology; D002858:Chromium Alloys / Q000737:chemistry; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007595:Joint Prosthesis; D008875:Middle Aged; D009999:Ossification, Heterotopic / Q000209:etiology; D011095:Polyethylenes / Q000737:chemistry*; D011474:Prosthesis Design; D011475:Prosthesis Failure; D013314:Stress, Mechanical; D013499:Surface Properties; D014025:Titanium / Q000737:chemistry; D019415:Torque
chemical_list: D000497:Alloys; D002858:Chromium Alloys; D011095:Polyethylenes; C111601:ultra-high molecular weight polyethylene; C031462:titanium alloy (TiAl6V4); D014025:Titanium; D000537:Aluminum Oxide