The accurate measurement of complex surfaces is difficult. Accuracy demands precision in measuring technology, i.e., the measuring machine and also precise mathematical representation of complex geometries. This paper introduces a method of measuring a complex surface by using a Coordinate Measuring Machine and representing the measured surfaces mathematically. This enables comparison with other surfaces, e.g.. the as-designed surface or the original unworn surface. The measurement of the knee prosthesis was taken as a case study.
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