Abstract
We describe the clinical and radiological results of 120 consecutive revision hip replacements in 107 patients, using a titanium alloy femoral component fully coated with Hydroxyapatite ceramic (HAC). The mean age at operation was 71 years (range 36 to 92). The average length of follow up was 8.0 years (range 5.0 to 12.4). All patients receiving a JRI Furlong HAC coated femoral component (JRI Instrumentation Ltd, London, UK) with a minimum follow up of 5 years were included. These included patients on whom previous revision hip joint surgery had taken place.
Patients were independently reviewed and scored using the Harris Hip Score (HHS), the Charnley modification of the Merle d’Aubigne and Postel Score (MDP), and The Western Ontario and McMaster Universities Osteoarthritis index (WOMAC). Radiographs were assessed by three reviewers (blinded to clinical details) for new bone formation, osteolysis, osteointegration and radiolucent lines in each Gruen Zone.
The mean Harris hip score was 85.8 (range 42 to 100) at the latest post-operative review. The mean WOMAC and MDP scores were 34.5 and 14.8 respectively. The mean pain visual analogue score (range 0 to 10) was 1.2 overall and 0.5 specifically for mid-thigh pain. There were no revisions of any femoral component for aseptic loosening. There were four stem re-revisions (3 cases of infection, 1 recurrent dislocation). Radiological review of all femoral components, including the four mentioned, revealed stable bone ingrowth with no new radiolucent lines in any zone. Using revision or impending revision for aseptic loosening as the end point, at 10 years the cumulative survival for the stem was 100% (95% CI 94 to 100). We present excellent medium to long term clinical, radiological and survivorship results with the use of a fully HAC coated titanium stem in revision hip surgery.
Theses abstracts were prepared by Professor Roger Lemaire. Correspondence should be addressed to EFORT Central Office, Freihofstrasse 22, CH-8700 Küsnacht, Switzerland.
