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Center index method—an alternative for wear measurements with radiostereometry (RSA)
Author(s) -
Dahl Jon,
Figved Wender,
Snorrason Finnur,
Nordsletten Lars,
Röhrl Stephan M.
Publication year - 2013
Publication title -
journal of orthopaedic research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.041
H-Index - 155
eISSN - 1554-527X
pISSN - 0736-0266
DOI - 10.1002/jor.22241
Subject(s) - intraclass correlation , nuclear medicine , mathematics , limits of agreement , orthodontics , medicine , reproducibility , statistics
Radiostereometry (RSA) is considered to be the most precise and accurate method for wear‐measurements in total hip replacement. Post‐operative stereoradiographs has so far been necessary for wear measurement. Hence, the use of RSA has been limited to studies planned for RSA measurements. We compared a new RSA method for wear measurements that does not require previous radiographs with conventional RSA. Instead of comparing present stereoradiographs with post‐operative ones, we developed a method for calculating the post‐operative position of the center of the femoral head on the present examination and using this as the index measurement. We compared this alternative method to conventional RSA in 27 hips in an ongoing RSA study. We found a high degree of agreement between the methods for both mean proximal (1.19 mm vs. 1.14 mm) and mean 3D wear (1.52 mm vs. 1.44 mm) after 10 years. Intraclass correlation coefficients (ICC) were 0.958 and 0.955, respectively ( p  < 0.001 for both ICCs). The results were also within the limits of agreement when plotted subject‐by‐subject in a Bland–Altman plot. Our alternative method for wear measurements with RSA offers comparable results to conventional RSA measurements. It allows precise wear measurements without previous radiological examinations. © 2012 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res 31: 480–484, 2013

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