Abstract
Objective- To review the 10-year results of 269, cemented total hip arthroplasties performed using matte surface finish Harvard femoral stem that is almost similar to Charnley femoral stem.
Design- Retrospective cross sectional survivorship study.
Patients and Methods- We retrospectively reviewed the results of 269 cemented total hip arthroplasties performed using Harvard femoral stem in 257 patients (M:F, 93:164. Mean age 71.2 years) between 1990–1994. We also reviewed a group of 51 patients who had hip arthroplasty performed on the contralateral side using cemented Charnley femoral stem. Radiographs were reviewed to evaluate following parameters: type of osteoarthritis, cement mantle thickness, alignment of the components, presence of aseptic loosening and radiolucent lines. Kaplan-Meier survival analysis was performed to calculate the survival of Harvard and Charnley femoral stem using various end points. Cox proportional-hazard analysis was performed to evaluate the impact of various radiological parameters on the prosthesis survival.
Results- Out of the 248 eligible patients (260 hips), 6 patients (7 hips) were lost to follow up and 67 patients were dead at the time of the study. 36 hips (35 patients) underwent revision surgery for aseptic failure (Median duration: 60 months, range: 12–125 months) and 11 hips were revised for septic failure (Median duration: 24 months, range: 10–53 months) from the index procedure. Femoral component was revised in all patients whereas acetabular component was revised in 27 patients. 10 year survival for the femoral and acetabular components using aseptic loosening (with and without revision surgery) as an end point was 77.5% (71.5%-83.5%) and 91.1% (87.2%-95%) respectively. Cox regression analysis did not reveal statistically significant (p> 0.05) impact of various radiological parameters on survival rate.
The 10 year survival in the bilateral hip arthroplasty group for the Charnley femoral component (Median follow up 138 months) and Harvard femoral component (Median follow up 120 months) using aseptic loosening as an end point was 95.2% (92.4%-98%) and 77.2% (69.2%-85.2%) respectively.
Conclusion- Our results suggest that the matte surface finish femoral component has less satisfactory long-term survival rate compared to smooth surface femoral stem with similar geometry.
The abstracts were prepared by Mr Peter Kay, Editorial Secretary. Correspondence should be addressed to British Hip Society, The Hip Centre, Wrightington Hospital, Appley Bridge, Wigan, Lancashire WN6 9EP.
