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Roentgen Stereophotogrammetic Analysis

The Roentgen Stereophotogrammetric Analysis (RSA) is used as the gold standard for in vivo assessment of the migration of a medical implant in the surrounding bone. The RSA-method has two main advantages compared to the conventional clinical EBRA-method (Einzel-Bild-Röntgen-Analyse): on the one hand, the high resolution of the relative motion (migration) between bone and implant in the range of a few tenths of a millimetre and, on the other hand, the shortening of the follow-up period from approximately 10 years to just 2 years. Before implantation of the prosthesis, tantalum beads with a diameter of 1 mm are placed in the surrounding bone (bone marker) to serve as a reference. The model-based RSA-method used in our laboratory represents an approach to calculate the migration of the implants relative to the bone markers using three-dimensional surface models.

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