UNCEMENTED ACETABULAR COMPONENT IN PRIMARY TOTAL HIP ARTHROPLASTY

Objectives: We present the level of biological fixation and the medium-term results of the hemispherical porous coated acetabular component. Methods: A number of 299 acetabular components type Duraloc 100 were placed to equivalent primary hip arthroplasties. The patients were 273 (26 bilateral), 218 women and 55 men with age which ranged between 22–80 years (aver. 52 yrs). We performed a press-fit technique to stabilize the cup and an acetabulum under-reaming of 2 mm. The size of the components we used was ranged between 48–56 mm. 175 cups were combined with the Elite cemented stem (hybrid), whereas 124 cups with the AML cementless stem. In every case a 10° hooded polyethylene liner was required. The postoperative protocol included early partial weight bearing for six weeks, full weight bearing after three months and follow up on the 3rd, 6th, 12th month and every year. The clinical evaluation was performed with D’ Aubigne-Postel system while the radiological evaluation according to the AAOS standards. The follow up period was ranged from 2 to 9 years (aver. 5,2 years). Results: During the last follow up no mechanical no radiological loosening was detected. The cup was definitely incorporated to the bone substrate. Conclusions: Eight years postoperatively the results are perfect. We believe that the hemispherical porous coated, press-fit acetabular component exhibits a satisfactory biological behaviour in primary hip replacements.