Outcome of the Stryker® Trident ‘All-Poly’ Constraint Acetabular Insert: A District General Hospital ExperienceHarrison SJ, Leeder DJ, McWilliams TG, Metcalf RW, Sidhom SA.
Constrained acetabular inserts are designed as revision solutions for unstable total hip arthroplasties to prevent dislocation and as a possible primary option for elderly patients at risk of recurrent dislocation.
Our aim was to establish clinical and radiological outcomes of an ‘all-poly’ constrained acetabular device and to highlight reasons for component failure.
We retrospectively reviewed our use of the Stryker® Trident ‘all-poly’ constrained acetabular insert between 2008 and 2013. All inserts were cemented directly into the acetabulum. Demographic data was collated. The indication for use of a constrained insert and postoperative complications were determined. Patients were reviewed clinically and underwent radiographic follow-up.
A total of 56 constrained inserts were utilised during the study period. Follow-up was for a minimum of 2 years (mean 4.0 years and range 2.0-6.8 years). The mean latest follow-up Oxford hip score was 34.6 (11-48). One postoperative superficial wound infection, 1 breakage of the constraining ring without clinical consequence and 1 recognised complication of liner failure at the bipolar interface were noted.
In the short to medium term, acetabular constraint offers a useful primary or revision option in patients at risk or with recurrent dislocation.