1. Center of Experimental Orthopaedics, Saarland University Medical Center, Homburg D-66421, Germany
2. Centro de Investigacións Científicas Avanzadas (CICA), Universidade da Coruña, Campus de A Coruña, 15071 A Coruña, Spain
3. Department of Orthopaedics and Orthopaedic Surgery, Saarland University Medical Center, Homburg D-66421, Germany