evaluation on two plastic materials for Vo's ankle implant

The purpose of this study is to evaluate two plastic materials, PMMA and UHMWPE, by using a material testing device "Robotic arch cycle motor" to imitate a normal body weight of 150 lbs. on Vo's artificial ankle implant. In this experiment, there are 82 sets of a three hours for UHMWPE, and 34 sets for PMMA have been applied to these materials with maintaining of 165 lbs. or 110% of a normal body weight person. In addition, timer, saline solution 0.5%, and thermometer are employed to set up a vivo human environment to maxim the accuracy dada collection. Number of cycles is recorded by computer and to be converted to the lifetime of Vo's ankle implant. The result shows that UHMWPE has a greater performance of 0.0176in in Vo's artificial ankle implant than PMMA.