Recently, hip cup rims have become the focus of attention, because the last few millimetres of contact loading between the head and cup edge can have a significant impact on how long a hip joint lasts.
The process of finishing the rim of a cup during manufacturing is separate from the creation of the main bearing surface. This often leads to an axial misalignment or continuity disconnect between these two important features of the joint. Although the cup rim is generally very well specified, it is a difficult feature to control in manufacturing and verifying the profile is very difficult and has been impractical.
In this study measurements were carried out with a RedLux Ultraprecision Optical CMM. Measurements provide very high-density data sets with nanometre resolution without contact. This allows the measurement and analysis of cup rim and bearing surface form of a large number of components within a short period of time.
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