Digital automated RSA compared to manually operated RSA

ER Valstar, HA Vrooman, S Toksvig-Larsen, L Ryd, RGHH Nelissen

    Research output: Contribution to journalArticleScientificpeer-review

    72 Citations (Scopus)


    The accuracy of digital Roentgen stereophotogrammetric analysis (RSA) was compared to the accuracy of a manually operated RSA system. For this purpose, we used radiographs of a phantom and radiographs of patients. The radiographs of the patients consisted of double examinations of 12 patients that had a tibial osteotomy and of double examinations of 12 patients that received a total hip prosthesis. First, the radiographs were measured manually with an accurate measurement table. Subsequently, the images were digitized by a film scanner at 150 DPI and 300 DPI resolutions and analyzed with the RSA-CMS software. In the phantom experiment, the manually operated system produced significantly better results than the digital system, although the maximum difference between the median values of the manually operated system and the digital system was as low as 0.013 mm for translations and 0.033° for rotations. In the radiographs of the patients, the manually operated system and the digital system produced equally accurate results: no significant differences in translations and rotations were found. We conclude that digital RSA is an accurate, fast, and user friendly alternative for manually operated RSA. Currently, digital RSA systems are being used in a growing number of clinical RSA-studies. Author Keywords: Digital RSA; Micromotion; Accuracy; Validation
    Original languageUndefined/Unknown
    Pages (from-to)1593-1599
    Number of pages7
    JournalJournal of Biomechanics
    Issue number12
    Publication statusPublished - 2000

    Bibliographical note

    phpub 51, NAGEKOMEN


    • academic journal papers
    • ZX CWTS JFIS < 1.00

    Cite this