“Early mobilisation after total hip or knee arthroplasty: A multicentre prospective observational study,” by Matthew J. Chua, Andrew J. Hart, Rajat Mittal, Ian A. Harris, Wei Xuan, and Justine M. Naylor (PLoS ONE 12(6): e0179820. doi.org/10.1371/journal.pone.0179820, XML, HTML, and .pdf format, 15p.).
journals.plos.org/plosone/article?id=10.1371%2Fjournal.pone.0179820