title: [The acetabular prosthesis: detection of a migration using ruler and pencil? Measurements on a pelvic phantom in comparison with a 3D computer simulation].
abstract: Conventional X-ray films were made with varying degrees of tilt of a pelvic phantom containing an acetabular prosthesis. The position of the prosthesis was then reconstructed graphically. The measurement errors were calculated and an estimate was made for the tilt. There is a linear correlation between the measurement error and the tilt of the prosthesis. Therefore a tilt dependent maximum error can be calculated. This error is very small for small degrees of tilt, so that acetabular migration can in this instance be evaluated with greater confidence than with other graphical methods. The error also correlates with the determination of the selected region of the acetabulum, but not with the position of the central focus spot or image magnification.
authors.affiliation: Abteilung Röntgendiagnostik, Klinikum der Georg-August-Universität Göttingen.
authors.forename: C G
authors.initials: CG
authors.lastname: Diederichs
authors.forename: U
authors.initials: U
authors.lastname: Fischer
authors.forename: R
authors.initials: R
authors.lastname: Vosshenrich
mesh_terms: D000077:Acetabulum; D000368:Aged; D003198:Computer Simulation; D005260:Female; D006622:Hip Prosthesis; D006801:Humans; D008961:Models, Structural; D011475:Prosthesis Failure
vernacular_title: Hüftpfannenprothese: Nachweis einer Migration mit Lineal und Bleistift? Messungen am Beckenphantom im Vergleich mit einer 3D-Computersimulation.