Dynamic Roentgen stereophotogrammetry Dynamic Roentgen stereophotogrammetry Dynamic Roentgen stereophotogrammetry (also referred to as dynamic RSA) is a modern and sophisticated x-ray recording method, used to measure real-time 3D motions of prostheses and bones during motion with high accuracy. It is mostly used in orthopedic research settings and is an advancement of conventional RSA. Conventional static RSA is used to evaluate migration of prosthesis with respect to the bone in three dimensions as a function of time. Migration of the prosthesis are normal 12‐24 months after the surgery. Ongoing migration increase the risk of aseptic loosening with revision surgery as a consequence. The method
David Roentgen flat-pack home assembly without an allen key. According to his biography in the Encyclopædia Britannica Eleventh Edition of 1911, Roentgen was not a great cabinetmaker: "His forms were often clumsy, ungraceful, and commonplace; his furniture lacked the artistry of the French and the English cabinetmakers of the great period which came to an end about 1790. His bronzes were poor in design and coarse in execution; his work, in short, is tainted by commercialism. As an inlayer, however, he holds a position of high distinction. His marquetry is bolder and more vigorous than that of Riesener, who in other respects