Abstract
The paper presents a study in vitro concerning the deviation from sphericity of some components of total hip prosthesis (acetabular cups and femoral heads). Prosthesis have been tested on an experimental stand, on which were simulated the loads and movements from coxo-femoral articulation. Deviation from sphericity was determined in accordance with ASTM standards and specifications from the ISO on a CMM machine (MMC). Thus, the standard deviation of the sphericity was measured at the beginning of the tests (initial phase) during tests (intermediate phase) and at the end of the tests (final phase). Two types of articulation have been tested: metal on Metal (MoM) and Metal on Polyethylene (MoP). We believe that the sphericity deviation is a very important parameter in determining wear and loss of implant prosthetic components.
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