A novel method to measure femoral component migration by computed tomography: a cadaver study

Friedrich Boettner*, Peter Sculco, Joseph Lipman, Lisa Renner, Martin Faschingbauer

*Corresponding author for this work
1 Citation (Scopus)


Introduction: Radiostereometric analysis (RSA) is the most accurate technique to measure implant migration. However, it requires special equipment, technical expertise and analysis software and has not gained wide acceptance. The current paper analyzes a novel method to measure implant migration utilizing widely available computer tomography (CT). Methods: Three uncemented total hip replacements were performed in three human cadavers and six tantalum beads were inserted into the femoral bone similar to RSA. Six different 28 mm heads (−3, 0, 2.5, 5.0, 7.5 and 10 mm) were added to simulate five reproducible translations (maximum total point migration) of the center of the head. Implant migration was measured in a 3-D analysis software (Geomagic Studio 7). Repeat manual reconstructions of the center of the head were performed by two investigators to determine repeatability and accuracy. Results: The accuracy of measurements between the centers of two head sizes was 0.11 mm with a CI 95 % of 0.22 mm. The intra-observer repeatability was 0.13 mm (CI 95 % 0.25 mm). The interrater-reliability was 0.943. Conclusion: CT based measurement of head displacement in a cadaver model were highly accurate and reproducible.

Original languageEnglish
JournalArchives of Orthopaedic and Trauma Surgery
Issue number6
Pages (from-to)857-863
Number of pages7
Publication statusPublished - 01.06.2016
Externally publishedYes

Research Areas and Centers

  • Academic Focus: Center for Brain, Behavior and Metabolism (CBBM)


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