Abstract
Introduction: The Centrament® (Aesculap, Tuttlingen, Germany) is modular hip system combined with a range of modular heads and acetabular components, enabling the system to cover a wide range of applications. We looked at medium term results in a district general hospital.
Methods: This is a retrospective cohort study. Information was obtained from patient notes and radiographs.
Results: One hundred and ninety two (n =192) total hip arthroplasties in 178 patients (14 bilateral) were followed up for at least 5 years (mean: 5.8 years; range: 5–9 years). The mean age of the patients at the time of surgery was 71.8 years (range, 38–91 years). The most frequent indication for surgery was osteoarthritis (94%). One acetabular cup was revised for aseptic loosening, and 2 cups were revised for recurrent dislocation. Two stems have been revised (one for aseptic loosening and one for prosthetic fracture). The dislocation rate was 4.2% during the initial fifty arthroplasties that reduced to 0.9% in the subsequent years. For radiological evaluation Gruen zones for the stem and DeLee and Charnley zones for the cup were used. The acetabular cup was satisfactory in 186 hips radiographs and showed asymptomatic non-progressive osteolysis in three cups. Two stems showed signs of osteolysis at nine years but the patients had no symptoms. Using the recommendation of revision as the endpoint, Kaplan Meier Survival Analysis showed a cumulative survival for the prosthesis as 97.3%, with stem survival of 99% and cup survival of 98.5%.
Discussion: In the medium-term, these results are comparable to other cemented hip prosthesis used in the UK.
Correspondence should be addressed to The Secretary, BHS, c/o BOA, The Royal College of Surgeons, 35–43 Lincoln’s Inn Fields, London WC2A 3PE.
