DOS 2018

260 · DOS Abstracts Complication rate of hemiarthroplasty for femoral neck fractures. A retrospective study of 201 hips with mean 3.2 years follow-up Nicolai Kjældgaard Kristensen, Polina Martinkevich, Steffan Tábori-Jensen, stig Jacobsen, Jeppe Barckman Orthopedics, Aarhus university Hospital; University Clinic for Hand, Hip and Knee Surgery, Hospital Unit West, Holstebro, Denmark Background: The discussion of whether hemiarthroplasty (HA) or total hip arthroplasty (THA) should be offered as treatment for displaced femoral neck fractures (FNF) is still ongoing. HA is considered a less invasive procedure and with a lesser trend to dislocation but with risk of secondary acetabular erosion. To facilitate the discussion of the indications for THA and HA we need to map the type and frequency of complications related to patients treated with HA at our institution. Purpose / Aim of Study: To retrospectively investigate the type and frequen- cy of complications in relations to HA in patients with displaced FNF, treated at Aarhus University Hospital. Materials and Methods: 198 patients (156 females) were operated with HA in the years 2012 and 2017. Pathological fractures were excluded and conver- tion from osteosynthesis to HA was included. Mean age was 83.2 years (range 57-104). Mean follow-up was 3.2 years (range 0.2-6.2). Data collection re- garding year 2013 to 2016 is still ongoing. Findings / Results: Preliminary data from 2012 and 2017 comprises 198 pa- tients (201 hips). 27 (13.3%) had documented dementia preoperatively. 1st time dislocation was observed in 13/201 hips (6,4%), of these 6/13 (46%) had dementia. Dislocation occurred within a mean of 14,7 days (range 7-29) after surgery. All patients received bipolar and cemented HA. 12 patients underwent reoperation. 4 convertions to THA, 2 periprosthetic fractures, 4 deep infections, 2 changes of components and 1 with extraarticular cement 78 patients (39 %) had died at follow-up, of which 13 died within 30 days after the operation. Conclusions: In with existing data we find a 1st time dislocation rate of 6.4% with a mean time of 14.7 days after HA- surgery and a 30-day mortality of 6.5%. The full data on all patients (n=648) operated between 2012-2017 will be presented at the DOS- conference. 201.