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Dislocations after use of dual-mobility cups in cementless primary total hip arthroplasty: prospective multicentre
Ji-Hyo Hwang1, Sang-Min Kim2, Kwang-Jun Oh3
1Department of Orthopedic Surgery, Gangnam Sacred Heart Hospital, Hallym University School of Medicine, Seoul, South Korea.
Background:
The purpose of this study was to investigate the incidence of dislocation and specific complications of the dual-mobility cup.
Methods:
The arthroplasties involved 167 hips in 165 patients; 51 hips (30.5%) were in men and 116 (69.4%) were in women. The active articulation E1® dual-mobility cup (Biomet, Warsaw, IN, USA) was used, and the surgical approach was posterolateral in 120 hips and anterolateral in 47 hips.
Results:
Four (2.3%) dislocations were observed. Mean time of dislocation was 30.5 days post-operatively. Three incomplete reductions occurred during closed reduction. When comparing parameters between dislocation and no-dislocation groups, there were no differences in patient and surgical parameters. However, all dislocations occurred in patients with femoral neck fractures and in the posterolateral approach group.
Conclusion:
The incidence of dislocation in total hip arthroplasty (THA) using a dual-mobility cup was acceptable, and cup diameter of the dislocation group was substantially larger than that of no-dislocation group. Based on clinical outcomes of our study, we conclude that the dual-mobility cup is a reliable option in THA, and further studies are necessary.
