Christopher J Nester1
, Alberto Leardini2
, Peter R Cavanagh3
, Dieter Rosenbaum4
and Joshua Burns5 
1
Centre for Rehabilitation and Human Performance Research, School of Health Care Professions, University of Salford, UK
2
Movement Analysis Laboratory, Istituto Ortopedico Rizzoli, Bologna, Italy
3
Department of Orthopedics and Sports Medicine, University of Washington, USA
4
Motion Analysis Laboratory, Orthopaedic Department, University Hospital Muenster, Germany
5
Discipline of Paediatrics and Child Health, Sydney Medical School, The University of Sydney/Institute for Neuroscience and Muscle Research, The Children's Hospital at Westmead, Sydney, NSW, Australia