The impact of the enhanced recovery pathway and other factors on outcomes and costs following hip and knee replacement: routine data study

1National Institute for Health Research Oxford Biomedical Research Centre, Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences, University of Oxford, Oxford, UK 2National Institute for Health Research Bristol Biomedical Research Centre, Musculoskeletal Research Unit, Translational Health Sciences, Bristol Medical School, University of Bristol, Bristol, UK 3Medical Research Council Lifecourse Epidemiology Unit, University of Southampton, Southampton General Hospital, Southampton, UK 4Centre for Statistics in Medicine, Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences, Nuffield Orthopaedic Centre, University of Oxford, Oxford, UK 5GREMPAL Research Group, Musculoskeletal Research Unit, Universitat Autònoma de Barcelona, Barcelona, Spain 6Patient representative 7Arthritis Research UK Primary Care Centre, Research Institute for Primary Care and Health Sciences, Keele University, Keele, UK 8Health Economics Research Centre, Nuffield Department of Population Health, University of Oxford, Oxford, UK 9Nuffield Department of Population Health, University of Oxford, Oxford, UK 10Nuffield Department of Primary Care Health Sciences, University of Oxford, Oxford, UK