Affiliation: | a Department of Medical Physics, Dryburn Hospital, Durham, UK b IRC in Biomaterials, Queen Mary and Westfield College, London, UK c Department of Orthopaedic Surgery, Hammersmith Hospital, London, UK d Department of Orthopaedic Surgery, Queen Elizabeth Hospital, Gateshead, UK e Department of Orthopaedic Surgery, Middlesbrough General Hospital, Cleveland, UK |