title: [A new computer-controlled device for stress images of the upper ankle joint].
abstract: A new apparatus has been developed for stress roentgenograms of the ankle joint to demonstrate rupture of the fibular collateral ligaments possible. The disadvantages of well-known techniques, such as manual application of stress and the use of holding devices are eliminated. The inversion stress is applied by a foot support driven by an electric motor. A microcomputer controls the force of inversion in dependence on reactive muscle splinting; i.e. the apparatus simulates the application of the inversion force by a physician acting according to feeling. In contrast to the radiography technique with manual holding, the patient is not able to press the foot against the inversion force if a pain-reflexive muscle contraction occurs. Other holding devices generate the inversion force with a threaded shank or traction weight; with the new device the patient's discomfort lasts only 2 s. In the last 5 years the new holding device has shown its reliability in about 1500 examinations.
authors.affiliation: Röntgenabteilung, Robert-Koch-Krankenhauses Gehrden.
authors.forename: H
authors.initials: H
authors.lastname: Fröhlich
authors.forename: A
authors.initials: A
authors.lastname: Weiss
authors.forename: U
authors.initials: U
authors.lastname: Varchmin
mesh_terms: D016512:Ankle Injuries; D001696:Biomechanical Phenomena; D006801:Humans; D007593:Joint Instability / Q000000981:diagnostic imaging*; D008023:Ligaments, Articular / Q000293:injuries*; D008838:Microcomputers; D011859:Radiography; D013679:Technology, Radiologic / Q000295:instrumentation*
vernacular_title: Eine neue computergesteuerte Vorrichtung für gehaltene Aufnahmen des oberen Sprunggelenks.