[Clinical results in hip replacement surgery with mild acetabular defects: a retrospective comparative study of cups with dual mobility and monopolar cups].

Abstract

Introduction: hip revision arthroplasty surgery is a surgical procedure that has been growing in recent years. Revision total hip arthroplasty (THA) is a notable surgical challenge due to the technical difficulty of the surgery itself. Complications of revision surgery includes dislocation, aseptic loosening, and infection.

Objective: to compare the clinical-radiological results, as well as the incidence of complications, of two independent samples of patients who underwent revision total hip arthroplasty (rTHA) with mild-moderate acetabular defects using dual mobility implants compared to monopolar implants.

Material and methods: retrospective comparative study of two cohorts of 30 patients who underwent acetabular revision surgery using large 36 mm monopolar heads or dual mobility respectively. All patients had Paprosky type I or II acetabular defects. The results on the VAS scale, WOMAC, and Harry hip score (HHS) were evaluated pre and postoperatively in both cohorts. Likewise, the incidence of postoperative complications and the survival rate between both groups were analyzed.

Results: mean follow-up was 5.8 years (1-10.3 years). The difference between the pre and postoperative results in each cohort was significant for the VAS, WOMAC and HHS scale. The differences obtained in these scales between the different study groups did not find significant differences. The incidence of postoperative complications between both cohorts was similar, without finding significant differences.

Conclusions: we consider that dual mobility does not provide superiority in terms of clinical-functional results and incidence of postoperative complications with respect to monopolar assemblies in acetabular revision surgery with mild-moderate defects.