Detail of a model-based RSA scene analyzing migration of the SRTMTMC joint prosthesis. Three bone markers (red spheres) with a poor three-dimensional spatial distribution (CN 1016) resulting in poor rotational accuracy. The arrows indicate the three-dimensional coordinate system. Positive migration along the X-, Y-, and Z-axis indicates radial, distal and dorsal translation of the prosthesis with respect to the trapezial bone