Papers by Gerhard van Wolfswinkel
Surgical and radiologic anatomy : SRA, Jan 21, 2016
In arthroplasty of comminuted radial head fractures, the contralateral radial head diameter can b... more In arthroplasty of comminuted radial head fractures, the contralateral radial head diameter can be used as reference for implant selection. However, potential bilateral asymmetry may result in a mismatch of the implant with the native bone. Therefore, our purpose was to evaluate anatomical right-to-left differences of radial head diameters. We also compared conventional two-dimensional (2D) with three-dimensional (3D) measurements. We used bilateral CT-scans from 25 intact proximal radius pairs of right-handed adult subjects to obtain 50 3D radial head models. After contralateral matching, diameters were calculated using a 3D-based method using an automated circle-fit in standardized cross-sections at the widest level midway through the radial head. The 3D-based diameters were compared to orthogonal line measurements in standard axial CT-slices. Three-dimensional analysis yielded a radial head diameter of 23.0 ± 1.7 mm. The dominant right side was significantly wider, with right-to-...
Introduction. Aseptic loosening is indicated as the main cause of knee implant failure. Despite a... more Introduction. Aseptic loosening is indicated as the main cause of knee implant failure. Despite all currently used techniques, it remains challenging to diagnose an aseptic loose knee implant. A promising technique to reveal aseptic loose related implant motions is inducible displacement (ID). ID measurements are used to detect implant motion relative to the bone. To diagnose a loose implant via ID, motion thresholds are required. Such thresholds are dependent on a number of subject specific factors including bone material, loading conditions, used implant and interface contact properties between implant and bone. Such thresholds do still not exist. As a first step towards subject specific motion thresholds, a finite element (FE) model can be used to investigate the factors affecting ID. Objective. To set-up and to validate a finite element model that can be used to simu-late inducible displacements of a tibial component of a knee implant. Method. As a basis for the finite element m...
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Papers by Gerhard van Wolfswinkel