title: Validation of a computer-assisted method for measurement of radiographic wear in total hip arthroplasty using all polyethylene cemented acetabular components.
abstract: Although cemented all polyethylene (PE) cups have been routinely used in total hip arthroplasty for decades, no computer-assisted method for measurement of radiographic wear has ever been specifically validated for these implants. Using a validated hip phantom model, AP plain hip radiographs were obtained consecutively for eight simulated wear positions. A version of Martell's Hip Analysis Suite software dedicated to all polyethylene sockets was used by three different examiners of varied experience. Bias (mean, standard deviation and 95% confidence interval limit), repeatability (standard deviation and 95% limit) and reproducibility (standard deviation and 95% limit) for two-dimensional wear measurements were assessed, as recommended by the current ASTM guidelines. Using this protocol, the dedicated software showed an overall mean bias of 0.089 ± 0.060 mm (mean ± SD), and 0.118 mm for 95% CI limit. Repeatability (intra examiner) standard deviation and 95% limit were respectively 0.106 mm and 0.292 mm. Reproducibility (inter examiner) standard deviation and 95% limit were respectively 0.112 mm and 0.308 mm. Martell Hip Analysis for all PE cemented cups is a reliable and low-cost instrument in the assessment of wear, despite being less precise than its original version dedicated to cementless components.
authors.affiliation: Service de chirurgie orthopédique et traumatologique, Hôpital Cochin, APHP, Université René Descartes, 27 rue du Faubourg Saint-Jacques, 75679, Paris CEDEX 14, France.
authors.forename: Jean
authors.initials: J
authors.lastname: Langlois
authors.forename: Amine
authors.initials: A
authors.lastname: Zaoui
authors.forename: Caroline
authors.initials: C
authors.lastname: Scemama
authors.forename: John
authors.initials: J
authors.lastname: Martell
authors.forename: Charles
authors.initials: C
authors.lastname: Bragdon
authors.forename: Moussa
authors.initials: M
authors.lastname: Hamadouche
mesh_terms: D019644:Arthroplasty, Replacement, Hip; D001843:Bone Cements; D006615:Hip / Q000000981:diagnostic imaging*; D006801:Humans; D007091:Image Processing, Computer-Assisted; D020959:Polyethylene; D011859:Radiography; D015203:Reproducibility of Results; D012984:Software
chemical_list: D001843:Bone Cements; D020959:Polyethylene
keywords: accuracy measurement; error measurement; polyethylene wear; precision measurement; total hip replacement