1. Department of Osteology and Biomechanics; University Medical Center Hamburg-Eppendorf; Hamburg Germany
2. Department of Orthopaedics; University Medical Center Hamburg-Eppendorf; Hamburg Germany
3. Institute of Orthopaedic Research and Biomechanics, Center of Musculoskeletal Research, University of Ulm; Ulm Germany
4. Department of Trauma, Hand and Reconstructive Surgery; University Medical Center Hamburg-Eppendorf; Hamburg Germany