Background: Femoral neck fracture (FNF) is a common intracapsular fracture in the elderly as a result of osteoporosis, which tends to increase with humans’ extended longevity. Regarding treatment for undisplaced FNF, internal fixation is mostly used, while primary total hip arthroplasty (THA) is used for older patients with displaced FNF because of the high rate of avascular necrosis and nonunion. THA shows a better functional result than internal fixation in treating FNF
however, dislocation is still a severe complication. Recently, the dual mobility cup (DMC) has become more and more popular as a solution to reduce dislocation. The purpose of this research is to evaluate the outcome of dual-mobility cups for FNF in the elderly. Methods: A retrospective study was carried out on 164 patients who had THA by means of a dual moblity cup and posterolateral approach in Hue Central Hospital from January 2018 to April 2023. Medical history, clinical and paraclinical features, and the modified Harris Hip Score (MHHS) were assessed. TraumaCad® software was used to measure the figures of hip prostheses. Results: One hundred and sixty-four patients with a mean age of seventy-five years were followed up from 6 to 64 months. More than 90% of patients had osteopenia and osteoporosis according to bone mineral density. The average figures include length of incision (7,4 cm), operation duration (66,4 minutes), blood loss volume (664,6 ml), discrepancy of leg length under 10mm (97%)
size of prothesis: shell (49,1mm), stem (11,6mm), head with short neck (90,2%). Radiological assessment showed that the mean abduction angle and anteversion angle were 48,1° ± 5,4° and 20.1° ± 5,6° respectively. There were four intraoperative calcar fractures (2,4%), three periprosthetic fractures (1,8%), no hip dislocation, no aseptic loosening and no infection. The overall MHHS was 92,1 ± 7. Conclusion: DMC is an alternative option to prevent dislocation and give good outcomes to elderly patients with FNF. Longer follow-up duration may have revealed complications of DMC.