Validation of a Computer-Assisted Method for Measurement of Radiographic Wear in Total Hip Arthroplasty Using All Polyethylene Cemented Acetabular Components

摘要

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 +/- 0.060mm (mean +/- SD), and 0.118mm for 95% CI limit. Repeatability (intra examiner) standard deviation and 95% limit were respectively 0.106mm and 0.292mm. Reproducibility (inter examiner) standard deviation and 95% limit were respectively 0.112mm and 0.308mm. 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. (c) 2015 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res 33:???-???, 2015.