Department of Orthopedic, Trauma, and Reconstructive Surgery, RWTH University Hospital of Aachen, 52074 Aachen, Germany. Department of Orthopedics, South West London Elective Orthopaedic Centre (SWLEOC), Dorking Rd, Epsom KT18 7EG, UK. Department of Medicine, Surgery and Dentistry, University of Salerno, Via S. Allende, 84081 Baronissi (SA), Italy. School of Pharmacy and Bioengineering, Keele University Faculty of Medicine, Thornburrow Drive, 01782 Stoke on Trent, UK. Queen Mary University of London, Barts and the London School of Medicine and Dentistry, Centre for Sports and Exercise Medicine, Mile End Hospital, 275 Bancroft Road, London E1 4DG, UK.