title: Stable fixation but unpredictable bone remodelling around the Lord stem: minimum 23-year follow-up of 66 total hip arthroplasties.
abstract: Early designs of uncemented hip implants turned out to be failures mainly because the prerequisites for durable implant fixation were unknown. One exception was the chrome-cobalt stem of the Madreporic Lord prosthesis. We prospectively studied this prosthetic design in 107 hips that underwent surgery in 1979-1986. At the last follow-up, five stems and 54 cups had been revised, corresponding to stem and cup survival rates of 92%±3% and 45%±5% at 26years. In all, 66 hips with remaining Lord stems were available for clinical follow-up 26years (24-29) after the index operation. The mean total Harris hip and pain scores were 81 (SD 14) and 41 (SD 5).
authors.affiliation: Department of Orthopaedics, Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg, Sahlgrenska University, Göteborg, Sweden.
authors.forename: Roland
authors.initials: R
authors.lastname: Zügner
authors.forename: Roy
authors.initials: R
authors.lastname: Tranberg
authors.forename: Peter
authors.initials: P
authors.lastname: Herberts
authors.forename: Bertil
authors.initials: B
authors.lastname: Romanus
authors.forename: Johan
authors.initials: J
authors.lastname: Kärrholm
mesh_terms: D000328:Adult; D000368:Aged; D019644:Arthroplasty, Replacement, Hip / Q000379:methods*; D016723:Bone Remodeling; D005260:Female; D005500:Follow-Up Studies; D006621:Hip Joint / Q000000981:diagnostic imaging / Q000601:surgery; D006622:Hip Prosthesis; D006801:Humans; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D011474:Prosthesis Design; D011859:Radiography; D013997:Time Factors