Optimization total deformation of knee implants made Ti6Al4V material Djoko Kustono, Retno Wulandari, Andoko, Poppy Puspitasari, Galih Adhi Kurniawan and Agus Dwi Putra MATEC Web Conf., 204 (2018) 07014 Published online: 21 September 2018 DOI: 10.1051/matecconf/201820407014