Primary hybrid and cementless totai hip arthroplasty. 5 to 10 year follow-up results

Abstract

Background / objective. The major issue of hip arthroplasty is the wearout or loosening of the acetabular component. Some authors prefer cemented and others cementless hip arthroplasty. In both cases the outcome is similiar. Each method in different periods has its own problems. The aim of the study was to evaluate the late outcome of primary cementless and hybrid total hip replacement 5–10 years after operation. Patients and methods There were 36 patients operated on and 39 operations of primary total hip arthroplasty performed using Bi-Metric hybrid and cementless endoprostheses in 1993–1998. The study included 27 patients (29 endoprostheses) who responded to invitation in 2002–2003. Anteroposterior radiographs of the hip joints were performed for the patients and the functional outcome was evaluated using the Harris Hip score scale. Results During 2002–2003 investigation was carried out on 29 (74%) of 36 hip arthroplasties performed in 1993–1998. Analysis of the data showed no radiolucency signs around the cementless fixation components. All of the components were stable. Bone ingrowth into the cementless prosthesis components was observed in 100% of cases. The osteolysis zones around the acetabular and femoral components were related to the wearout of polythene insertion, but it was asymptomatic. There was no reliable difference between polythene insertion wearout and the type of prosthesis. Ectopic ossification was observed in 76% of cases. Conclusions: The study based on HHS score revealed good and very good results 5–10 years after operation. They were comparable with the findings in similar studies. Rentgenological features indicated that there were less alterations around the femoral component compared to the acetabular. Osteolysis around the femoral and acetabular components was asymptomatic and ectopic ossification found in 76% of cases did not interfere with the good functional results