Prospective longitudinal study of one hundred patients with total hip arthroplasty using a second-generation cementless dual-mobility cup

Abstract

Purpose: The aim of our study was to assess the radio-clinical results, mid-term survivorship and dislocation rate of a new-generation dual-mobility cup.

Methods: The first 100 patients (104 primary total hip arthroplasties) who were implanted with a new-generation cementless dual-mobility cup (Sunfit TH, Serf, Décines) were included in our study, with a minimum follow-up of five years.

Results: Average follow-up was six years ± 0.44 (5-7). At last follow-up, the Harris and PMA scores were significantly improved, from 56 to 94 and 13 to 17 respectively (p < 0.001). No radiolucent line could be observed. There were no cases of prosthetic or intraprosthetic dislocation in our series. Survivorship without cup loosening as the endpoint was 100 %.

Conclusions: This study confirmed the interest of dual mobility in preventing prosthetic hip dislocation. Intraprosthetic dislocation is a complication that seems to have been resolved in the mid-term follow-up.

Keywords: Cementless; Dislocation; Dual-mobility cup; Titanium-hydroxyapatite coating.