Correspondence to Elisa L Zwerus, Department of Orthopaedic Surgery, Shoulder and elbow unit, Onze Lieve Vrouwe Gasthuis, Oosterpark 9, 1091 AC Amsterdam, The Netherlands; elisazwerus{at}gmail.com ...

experiencing supination and pronation. But what is supination? Supination is when the foot rolls outward while pronation is when it rolls inwards. Supination is something runners should be aware ...