الفهرس 
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Abstract
The choice between performing Total hip arthroplasty with a dual mobility cup (DMC) or Bipolar hemiartroplasty (BHA) is not straight forward in old patients above 65 years old with displaced femoral neck fractures (DFNF). This led to carry out a prospective study to determine the rate of dislocation, clinical score ,functional outcomes and medical complications for these two modalities.
In the period between May 2018 to May 2019 a comparative randomized prospective study was done involving 80 patients aged over 65 years with displaced femoral neck fractures.
We divided them into two equal groups :First group was treated by total hip replacement with a dual mobility cup. The other group was treated by bipolar hemi arthroplasty.
All 40 patients of the bipolar group received cemented stem , The other 40 Patients of Dual mobility total hip arthroplasty: 34 patients received cementless DM cup (Novae E TH, SERF, France®) with cemented stem. 6 patients received cemented DM cup (Novae stick, SERF, France®) with cementless stem.
Patients were prospectively evaluated using the modified Harris Hip Score (MHHS) in addition to radiological evaluation at 1, 3, and 6 months.
At an average follow-up period of 6 months (range 3–9 months)in both groups, the Modified Harris hip score (MHHS) was significantly higher (p=0.001*) in the DMC group .
The dislocation rate was significantly higher (p=0.040*) in the BHA group. The BHA group demonstrated significantly less intra-operative blood loss (p=0.001*), a shorter length of operation (p=0.001*). and a shorter length of hospital stay(p=0.001*) .