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Int Orthop. 2018 Apr;42(4):761-767. doi: 10.1007/s00264-017-3660-6. Epub 2017 Oct 7.

Dislocations after use of dual-mobility cups in cementless primary total hip arthroplasty: prospective multicentre series.

Author information

1
Department of Orthopedic Surgery, Gangnam Sacred Heart Hospital, Hallym University School of Medicine, Seoul, South Korea.
2
Department of Orthopedic Surgery, Seoul Medical Center, Seoul, South Korea.
3
Department of Orthopedic Surgery, KonKuk University Medical Center, KonKuk University School of Medicine, Seoul, South Korea.
4
Department of Orthopedic Surgery, School of Medicine, Hanyang University, 222-1, Wangsimni-ro, Seoul, South Korea. estone96@hanyang.ac.kr.

Abstract

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.

KEYWORDS:

Dislocation; Dual mobility cup; Hip; Total hip arthroplasty

PMID:
28986663
DOI:
10.1007/s00264-017-3660-6
[Indexed for MEDLINE]

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