Purpose : To evaluate the early results and the occurrence of complications of cementless total hip arthroplasty(THA) using a alumina-on-alumina articulation with minimum 3 years follow up. o evaluate the 3-year follow up results of the clinical and radiographic of the cementless total hip arthroplasty using the COREN Hip System® with a third generation alumina-on-alumina articulation on a retrospective basis.
Materials and Methods : We prospectively followed 108 patients (121 hips) who underwent cementless THA using a alumina-on-alumina articulation. The mean age of the patients was 50.7 years(range, 20-80 years) and mean follow up period was 48 months(range, 36-60 months). Preoperative diagnoses was osteonecrosis of femoral head in 90 hips; secondary osteoarthritis due to hip dysplasia in 24 hips; secondary osteoarthritis after acetabular fracture in 4 hips; acute femoral neck fracture in 3 hips. Clinical evaluation was performed using a Harris hip score(HHS) and radiographic evaluation was done in terms of the fixation of components and the prevalence of osteolysis. Also, we observed complications including the occurrence sounds or fracture of alumina head or liner.
Results: Mean HHS improved from 62.4 points to 94 points at final follow-up. Thigh discomfort was found in 6 hips and mild inguinal discomfort was found in 8 hips. Both had disappeared within a year after operation. Clicking sound was found in 2 patients. One hip had dislocated and one alumina liner fracture had occurred. Loosening of component or osteolysis was not observed in any hip. The radiographic wear was not measurable.
Conclusion : Early results of cementless THA using a alumina-on-alumina articulation demonstrated favorable results with osseointegration of the components and absence of periprosthetic osteolysis. However, longer-term follow up for hip clicking sound and fracture of alumina fracture are necessary.