BY NICOLA MAFFULLI, M.D., M.S., PH.D., F.R.C.S.(ORTH)[dagger], ABERDEEN, SCOTLAND*No benefits in any form have been received or will be received from a commercial party related directly or indirectly to the subject of this article. Funds were received in total or partial support of the research or clinical study presented in this article. The funding source was Wellcome Trust, London, England.(MAFFULLI) Department of Orthopaedic Surgery, University of Aberdeen Medical School, Polwarth Building, Foresterhill, Aberdeen AB25 2ZD, Scotland. E-mail address: email@example.com.