Early Results of a New Highly Porous Modular Acetabular Cup in Revision Arthroplasty

Abstract

Background The ‘Tritanium’® (Stryker, New Jersey, USA) highly porous acetabular cup is a new implant used in revision hip arthroplasty. Aim To determine the early results of this device. Methods A prospective study of 43 acetabular component revisions performed using the implant between March 2007 and February 2008 was undertaken. All procedures were performed at a single centre with standard approach and follow up. Results The mean age of patients at surgery was 66 years. Mean follow up was 18.2 months. AAOS classification revealed 17% type 1, 49% type 2, 24% Type 3 and 5% Type 4 defects at surgery. 5% had no bone defect. Bone graft was used to in 73% of patients. Mean Harris Hip Score improved from 68 pre-operatively to 86 at the last follow-up. Cup integration was seen in 95% of patients by 6 weeks. One patient with pelvic discontinuity had symptomatic aseptic loosening which was revised. Conclusion The ‘Tritanium'acetabular cup has been successful in achieving rapid osseointegration with few complications. The management of pelvic discontinuity continues to be a challenge.