No dislocations after primary hip arthroplasty with the dual mobility cup in displaced femoral neck fracture in patients with dementia. A one-year follow-up in 20 patients.
OBJECTIVE
The aim of this study was to describe the dislocation rates, reoperation rates and mortality 30 day and one year following THA with AVANTAGE®dual mobility cup among dementia patients with an acute displaced intracapsular femoral neck fracture.


METHODS
From 2010 to 2014 we identified 20 hip fracture patients with dementia, who have had total hip arthroplasty with the AVANTAGE®dual mobility cup. The primary outcome was dislocation. Secondary outcomes were revision surgery, 30 days and one year mortality, time to surgery and length of hospital stay.


RESULTS
Follow-up time was one year. None of the patients experienced dislocation or received revision surgery in the follow-up period. The 30-days mortality rate was 25% (confidence interval (CI) 95%; 4-46%) and the one year mortality was 45% (CI 95%; 21-69). Mean time to surgery was 27 h (CI 95%; 20-37 h) and mean length of hospital stay was 5.5 days (CI 95%; 4, 0-7, 6 days).


CONCLUSIONS
THA with the dual-mobility cup seems favourable in the treatment of patients with a displaced femoral neck fracture and patients with dementia. Correct placement of the cup is pivotal and technically demanding. Not all orthopedic surgeons perform total hip arthroplasty while challenges regarding the logistics can be encountered since time to surgery is known to affect the mortality negatively.
Department of Orthopedic Surgery, Hospital Horsens, 8700 Horsens, Denmark.
Anders Elneff
AE
Graversen
Department of Orthopedic Surgery, Aarhus University Hospital, 8000 Aarhus, Denmark.
Stig Storgaard
SS
Jakobsen
Department of Orthopedic Surgery, Hospital Horsens, 8700 Horsens, Denmark.
Pia Kjær
PK
Kristensen
Department of Orthopedic Surgery, Aarhus University Hospital, 8000 Aarhus, Denmark.
Theis Muncholm
TM
Thillemann