The Results of Primary Cementless THA using Landos Hydroxyapitite-Coated Prosthesis: Minimum 5 Year Follow-up

Abstract

Purpose: To evaluate the results of primary cementless total hip arthroplasty (THA) using the Landos Atoll hydroxyapatite (HA)-coated cup and the Euroform HA-coated stem. Materials and Methods: Sixty-four primary THA were performed between November 1991 and October 1994, and were followed more than 5 years. Clinical and radiological results were assessed. Also, the evidence of loosening were observed. Results: The mean Harris hip score improved from 57.0 points preoperatively to 88.5 points postoperatively. Of the 64 cases of femoral stems, 54 cases (84.4%) were classified as stable bone-ingrowth fixation, and 10 cases (15.6%) as stable fibrous fixation at the last follow-up. The linear wear of polyethylene insert was 1.83 mm (0.14-4.15 mm) and the linear wear rate was 0.23 mm/yr (0.02-0.72 mm/yr). During the follow-up period, revisions were required in 31 cases (48.4%); 18 cases (28.1%) had been reoperated upon and 13 cases were (20.3%) awaiting for reoperation. Excessive early osteolysis were observed in 3 cases within 5 year. 1 case in those 3 cases underwent cup revision and another 2 cases underwent head and liner change with bone grafting. Conclusion: Landos Atoll HA-coated acetabular cup which followed for minimum 5 years reveals 48.4% failure rate.