The use of dual mobility cups in primary total hip arthroplasty: A bicentric, retrospective study of 196 implants

This retrospective bi-centre study aims to present our experience with the use of dual mobility cups. The primary endpoint was the evaluation of outcomes after dual mobility hip replacement. The total cohort was composed of 196 THAs, operated between 2015-2021: 35.4% male, 64.6% female (64.6%), mean age 63.6 years. We used 3 different stems, the femoral head was composed of ceramic (93.9%) or metal (6.1%); the size was always 28 mm. The average Harris Hip Score was 34.3 ± 15.8 (min 4-max 69) preoperative, and 91.2 ± 6.7 (min 61-max 100) at 3 months follow-up. The Harris Hip Score grading was “Excellent” in 65.8% cases. The outcome was significantly better in young patients (p value < 0.001). We registered an overall dislocation rate of 0%, while we reported 8 revisions (4.1%), due to periprosthetic fracture (4), aseptic loosening (1), infection (1), component breakage (1) and pain (1). The dual mobility system is an effective solution within primary hip replacement: it reduces wear and loosening forces, increasing joint range and prosthesis stability, with a very low incidence of dislocation. In younger patients and in arthritic ones, even better results can be expected. (www.actabiomedica.it).