1. CeramTec GmbH , CeramTec-Platz 1-9, Plochingen 73207, Germany ; , Zurich 8093, Switzerland
2. Institute for Biomechanics, D-HEST, ETH , CeramTec-Platz 1-9, Plochingen 73207, Germany ; , Zurich 8093, Switzerland
3. Institute for Biomechanics, D-HEST, ETH , Hönggerbergring 64, HPP O-22, Zurich 8093, Switzerland
4. CeramTec GmbH , CeramTec-Platz 1-9, Plochingen 73207, Germany