title: In vivo polyethylene wear of bilateral total hip replacements - cemented versus uncemented modular sockets.
abstract: We assessed polyethylene wear and osteolysis in 15 patients (30 hips) undergoing staged bilateral total hip arthroplasties, who had a cemented arthroplasty on one side and a hybrid arthroplasty on the other. All factors apart from mode of acetabular component fixation were matched. Wear was measured radiographically using Livermore's technique. The mean clinical and radiological follow-up was 11.2 years for the cemented and 10.7 years for the hybrid arthroplasties. Mean annual linear wear rate was 0.09mm/year in the cemented sockets and 0.14mm/year in the uncemented sockets. This difference was statistically significant (p=0.03), confirming previous reports that the rate of polyethylene wear is increased in uncemented sockets. No periacetabular osteolysis was noted. Femoral osteolysis in zone 7 occurred in 3 hybrid arthroplasties. It appears not all patients are equally affected. These results are further discussed.
authors.affiliation: Department of Orthopaedics, Royal Surrey County Hospital, Guildford, Surrey, UK. bexkampa@doctors.org.uk
authors.forename: Rebecca J
authors.initials: RJ
authors.lastname: Kampa
authors.forename: Andrew
authors.initials: A
authors.lastname: Hacker
authors.forename: Emmett
authors.initials: E
authors.lastname: Griffiths
authors.forename: John W
authors.initials: JW
authors.lastname: Rosson
mesh_terms: D000077:Acetabulum / Q000000981:diagnostic imaging / Q000601:surgery; D000368:Aged; D019644:Arthroplasty, Replacement, Hip / Q000379:methods*; D001843:Bone Cements; D002484:Cementation; D020099:Coated Materials, Biocompatible; D005260:Female; D005269:Femur / Q000473:pathology / Q000601:surgery; D006621:Hip Joint / Q000000981:diagnostic imaging / Q000601:surgery; D006622:Hip Prosthesis; D006801:Humans; D008297:Male; D008875:Middle Aged; D010014:Osteolysis / Q000209:etiology / Q000473:pathology; D020959:Polyethylene; D011474:Prosthesis Design; D011475:Prosthesis Failure; D011859:Radiography; D013499:Surface Properties
chemical_list: D001843:Bone Cements; D020099:Coated Materials, Biocompatible; D020959:Polyethylene