1. Department of Orthopedics and Trauma SurgeryUniversity Hospital Essen Hufelandstraße 55 45134 Essen Germany
2. Clinic for Orthopedics and Trauma SurgerySt. Barbara‐Hospital Gladbeck Barbarastraße 1 45964 Gladbeck Germany
3. Airbus Group InnovationsAirbus Defence and Space GmbH 82024 Taufkirchen Germany