The global cohort: All the patients who received a Tornier Dual Mobility acetabular cup between October 2010 and October 2011 and who we were able to be contacted by phone.

"Primary replacement" group: All the patients who received a Tornier Dual Mobility acetabular cup between October 2010 and October 2011 for primary hip replacement and who were seen for their follow-up visit at 2 years post-procedure.

"Revision" group: All patients who received a Tornier Dual Mobility acetabular cup between October 2010 and October 2011 for revision surgery and who were seen for their follow-up visit at 2 years post-procedure.

All the performance criteria were analysed for the patients in the "Primary replacement" and "Revision" groups

Read more: http://www.clinicaltrials.gov/ct2/show/NCT02062450?cond=%22Arthritis%22&lup_s=01/29/2014&lup_d=30