Sacroiliac joint (SIJ) biomechanics have been described in both in vitro and in vivo studies. A standard for joint coordinate systems has been created by the International Society of Biomechanics for most of the joints in the human body. However, a standardized joint coordinate system for sacroiliac joint motion analysis is currently still lacking. This impedes the comparison across studies and hinders communication among scientists and clinicians. As SIJ motion is reported to be quite limited, a proper standardization and reproducibility of this procedure is essential for the interpretation of future biomechanical SIJ studies. This paper proposes a joint coordinate system for the analysis of sacroiliac joint motion, based on the procedure developed by Grood and Suntay, using semi-automated anatomical landmarks on 3D joint surfaces. This coordinate system offers high inter-rater reliability and aspires to a more intuitive representation of biomechanical data, as it is aligned with SIJ articular surfaces. This study aims to encourage further reflection and debate on biomechanical data representation, in order to facilitate interpretation of SIJ biomechanics and improve communication between researchers and clinicians. ß

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For the design and simulation of high speed interconnection systems and fast digital computers it is imperative to consider both the two-dimensional modelling of bus structures in different technologies and to take the presence of so-called discontinuities (e.g. via-holes, line crossings, packages and connectors) into account. The paper presents quasi-TEM capacitance calculations based on an integral equation technique. As typical examples we studied the effect of etching on the impedance of striplines and impedance calculations for the shielded wire configuration. Furthermore, we considered the capacitance of via-holes and of line crossings.