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? 2010 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res 29:74�C78, 2011 ""The stem�Cneck taper interface of bimodular hip endoprostheses bears the risk of micromotions that can result in ongoing corrosion due to removal selleck products of the passive layer and ultimately cause implant fracture. We investigated the extent of micromotions at the stem�Cneck interface and the seating behavior of necks of one design made from different alloys during daily activities. Modular hip prostheses (n?=?36, Metha?, Aesculap AG, Germany) with neck adapters (CoCr29Mo6 or Ti6Al4V) were embedded in PMMA (ISO 7206-4) and exposed to cyclic loading with peak loads ranging from walking (Fmax?=?2.3?kN) to stumbling (Fmax?=?5.3?kN). Translational and rotational micromotions at the taper interface and seating characteristics during assembly and loading were determined using four eddy-current sensors. Seating during loading after implant assembly Imatinib cell line was dependent on load magnitude but not on material coupling. Micromotions in the stem�Cneck interface correlated positively with load levels (CoCr: 2.6�C6.3??m, Ti: 4.6�C13.8??m; p?Oxymatrine alloy femoral head. The PCU liner showed excellent wear characteristics in terms of its low and steady volumetric wear rate (5.8�C7.7?mm3/Mc) and low particle generation rate (2�C3?��?106 particles/Mc). The latter is 5�C6 orders of magnitude lower than that of highly cross-linked polyethylene and 6�C8 orders of magnitude lower than that of metal-on-metal bearings. Microscopic analysis of the implants after the simulation demonstrated a low damage level to the implants' articulating surfaces. Thus, the compliant PCU bearing may provide a substantial advantage over traditional bearing materials.