The 6 to 10 year results of the CSF hydroxyapatite coated acetabular cup
Andrew F.M. McKee, M.D. George, R. Hussein, J.AN. Shepperd
Category: Furlong Clinical Results
Conquest Hospital, Hastings, England
Aims: To assess the medium term results of this design of hydroxyapatite coated press fit cup.
Methods: This series represents the first 179 consecutive hips performed using the CSF press fit cup (JRI, London UK) at our institution by or under the direct supervision of one surgeon (JANS). We did not routinely augment the cup with screws. All hips were followed up prospectively in dedicated hip research clinics and assessed clinically and radiologically.
Results: Of 179 hips in 153 patients, 21 had bilateral procedures under one anaesthetic, 5 had staged bilateral replacement. The mean age at operation was 69 years (range 39-90 years). The mean follow up was 7 years and one month (range 6-10 years). One patient was lost to follow up. Six patients had revision surgery (infection 2, late acetabular fracture following trauma 1, recurrent dislocation 2, aseptic loosening 1). 31 patients have subsequently died but none had evidence of component failure at their last follow up. The latest Merle D’ Aubigné & Postel hip scores are 5.8 for pain, 5.5 for movement and 4.8 for function. No patient has evidence of radiological failure at latest follow up.
Conclusions: The medium term results of this type of acetabular cup are good and we continue to use this prosthesis. We have not encountered a problem with ‘backside wear’ and osteolysis at the site of the screw holes and have only one case of aseptic loosening. These findings are in contrast to much higher rates of mechanical failure described by some authors with press fit hydroxyapatite coated cups and indicate that cup design or technical error may be at fault rather than the hydroxyapatite coating itself.
Poster presented at EFORT 2003, Helsinki, Finland, June 4 – 10 2003.