Text and Data Mining valid from 2018-05-31
Received: 12 April 2018
Accepted: 25 May 2018
First Online: 31 May 2018
Compliance with ethical standards
: One author reports he is Medical Director of the National Joint Registry of England and Wales (NJR), Chairman of the NJR Editorial Board and Past President of the International Society of Arthroplasty Registers (ISAR). The senior author reports grants and personal fees from DePuy Synthes, personal fees from Springer, outside the submitted work; he is Associate Editor of Hip International and a Research Committee Member for British Orthopaedic Association.