title: Influence of Pelvic Tilt on Polyethylene Wear after Total Hip Arthroplasty.
abstract: We aimed to evaluate the effects of pelvic tilt on polyethylene wear after total hip arthroplasty (THA). A total of 105 joints treated with primary THA were included; conventional polyethylene (CPE) liners were used in 43 hips and highly cross-linked polyethylene (HXLPE) liners were used in the remaining 62 hips. The pelvis was tilted 6° posteriorly in the standing position as compared to the supine position, which resulted in significant increases of 1.7° and 2.8° in cup inclination in the CPE and HXLPE groups, respectively. Moreover, the change in pelvic tilt resulted in significant increases of 3.6° and 4.9° in cup anteversion in the CPE and HXLPE groups, respectively. For the CPE group, multiple regression analysis showed a significant association between the angle of pelvic tilt (PTA) and cup inclination and the polyethylene wear ratio. The adjusted R (2) of the regression model was larger for measures obtained in the standing position as compared to the supine position. For the HXLPE group, there was no significant relationship between radiographic parameters and polyethylene wear. Close observation of polyethylene wear is recommended for patients with severe posterior pelvic tilt who have undergone THA with conventional polyethylene.
authors.affiliation: Department of Orthopaedic Surgery, Yokohama City University, Yokohama 236-004, Japan.
authors.forename: Taro
authors.initials: T
authors.lastname: Tezuka
authors.affiliation: Department of Orthopaedic Surgery, Yokohama City University, Yokohama 236-004, Japan.
authors.forename: Yutaka
authors.initials: Y
authors.lastname: Inaba
authors.affiliation: Department of Orthopaedic Surgery, Yokohama City University, Yokohama 236-004, Japan.
authors.forename: Naomi
authors.initials: N
authors.lastname: Kobayashi
authors.affiliation: Department of Orthopaedic Surgery, Yokohama City University, Yokohama 236-004, Japan.
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Ike
authors.affiliation: Department of Orthopaedic Surgery, Yokohama City University, Yokohama 236-004, Japan.
authors.forename: So
authors.initials: S
authors.lastname: Kubota
authors.affiliation: Department of Orthopaedic Surgery, Yokohama City University, Yokohama 236-004, Japan.
authors.forename: Masaki
authors.initials: M
authors.lastname: Kawamura
authors.affiliation: Department of Orthopaedic Surgery, Yokohama City University, Yokohama 236-004, Japan.
authors.forename: Tomoyuki
authors.initials: T
authors.lastname: Saito
mesh_terms: D019644:Arthroplasty, Replacement, Hip; D001696:Biomechanical Phenomena; D003432:Cross-Linking Reagents / Q000494:pharmacology; D005260:Female; D017276:Friction; D006615:Hip / Q000000981:diagnostic imaging; D006801:Humans; D016014:Linear Models; D008875:Middle Aged; D010388:Pelvis / Q000033:anatomy & histology* / Q000000981:diagnostic imaging / Q000502:physiology*; D020959:Polyethylene / Q000737:chemistry*; D011475:Prosthesis Failure; D011859:Radiography; D012189:Retrospective Studies
chemical_list: D003432:Cross-Linking Reagents; D020959:Polyethylene