Purpose of the study: The aim of the study is an assessment of short-term results after the implantation of cementless Zweymüller Bicon cup in patients with a complicated anatomy after acetabular fractures.
Material: The group of 10 patients indicated for Zweymüller cementless THR in post-traumatic osteoarthritis after acetabular fracture was selected of the total number of 703 primary implantations performed in 1998 and 1999 at the authors' Orthopaedic Department. The group includes patients treated conservatively as well as by means of open reduction and fixation.
Methods: For the evaluation we used Harris Hip Score and radiographic assessment based on radiographs in two projections on which signs of implant loosening and incidence of particular ossifications were monitored.
Results: Harris Hip Score was in 6 cases higher than 90 points, in 2 cases its value was 80 points. The low score in another 2 patients related to the limitation of the function resulting from the trauma and in one case from the injury of sciatic nerve during open reduction and fixation with a subsequent common peroneal nerve palsy. Radiographic check did not reveal any signs of loosening of the implant. Within the evaluation of particular ossifications the finding was 3 times classified in Group 1 and twice in Group 2.
Discussion: The number of patients of the authors' group corresponds with the numbers of patients presented in literature, however, due to a short time of the follow-up both clinical and radiographic results in our group are better. In all cases a good primary stability and position of the acetabular cup in the complicated anatomical conditions was obtained. Structural bone grafting was not necessary in any of the cases. Peroperative complications were not encountered.
Conclusion: Short-term results of our small group of patients are very good. Both in the clinical and radiographic evaluation they correspond with the results of Zweymüller THR performed in patients with dysplastic acetabulum.