DOS 2018

226 · DOS Abstracts The Danish Hip Arthroscopy Registry: Continuous improvement in registration completeness, but there is room for improvement Erik Poulsen, Bent Lund, Eleanor Boyle, Ewa M. Roos Department of Sports Science and Clinical Biomechanics, University of Southern Denmark; Department of Orthopaedic Surgery, Horsens Regional Hospital Background: In 2012, registration completeness in the Danish Hip Arthroscopy Registry (DHAR) was 64%. Purpose / Aim of Study: To update registry completeness, including age group differentiation and regional differences. Materials and Methods: We compared proportions of yearly registrations in DHAR to registrations in the Danish National Patient Registry (DNPR) from in- ception in 2012 until 2017. We further stratified for age (<25, 25-39, ≥ 40) and hospitals performing hip arthroscopies (five regions of Denmark) in evalu- ation of baseline differences between responders and non-responders at one- year follow-up. Findings / Results: From February 2012 to March 2017, 3,851 arthroscopic hip surgeries were registered in DHAR and 4,627 in DNPR. The yearly comple- tion rate increased from 64% for 2012 to 97% for 2016. As of March 2018, 2,449 patients had completed their one-year follow-up questionnaires and of these 44 patients (<1%) had returned their one-year follow-up questionnaire but were not registered at baseline. A significant proportion of those younger than 25 year had not responded to the one-year follow-up questionnaire (38% non-responders). For all age groups, the region of Mid Jutland had the high- est proportion of responders (72%), followed by the Capitol Region (68%) and Southern Denmark (64%). North Jutland reported the lowest proportion of re- sponders (57%). The region of Zealand was not included due to small number of reported surgeries (n=9). Conclusions: A continuous improvement in registration of arthroscopic sur- geries in DHAR is seen over time reaching 97% in 2016. The young adults and patients from the Northern part of Denmark had lower return rates at the one- year follow-up. 167.