Outcome of dual mobility Acetabular cup for instability in total hip Arthroplasty

: Background: Dislocation after revision total hip arthroplasty (THA) continues to be one of the most common and concerning complications after the procedure. Dual-mobility (DM) acetabular components decrease the risk of post-operative instability also in high-risk patients, both in primary and revision hip arthroplasty. This study aimed to evaluate the outcome of DM acetabular cup (DMC) for instability in THA. Methods: This prospective study included 20 patients with Hip abductor insufficiency underwent total hip replacement using dual mobility cup. Complete local examination of the involved hip joint and radiological evaluation to ensure precise templating The Harris hip score (HHS) is used for clinical evaluation of patients at 6 weeks, 3months, 6 months, and the last follow-up. Standard radiographs are taken for all patients at subsequent follow-up examinations to examine component position or migration, osteolysis and loosening, and union of transfemoral osteotomy if used. Results: Regarding the prothesis, Cementless cup-Cementless stem was used in 3 (15.0%) patients, Cemented cup-Cementless stem was used in 9 (45.0%) patients and Cemented cup-Cemented stem was used in 8 (40.0%) patients. Harris hip score is improved over time postoperatively. HHS was significantly higher after 6 wks., after 6 months and after 1 years compared to preoperative HHS. Conclusion: the use of DMC has been found to be an effective technique for preventing hip arthroplasty instability. The clinical outcomes achieved with DMC were quite satisfactory, and the incidence of complications was significantly lower compared to other techniques.