[The Beznoska uncemented acetabular cup in hip joint arthroplasty]

To present the results of a trial of the non-cemented Beznoska cup.

During the period from 1993 to 1997, a total of 43 Beznoska cups were implanted in 40 patients, 17 men and 23 women, with the average age of 61 and 65 years, respectively. Primary hip arthritis was the most frequent indication for arthroplasty. Most cups were used in combination with a cemented stem.

In 2002, 37 patients were examined. The follow-up period ranged from 5 to 10 years. Clinical evaluation was based on the Harris hip scores. X-ray films were examined for cup osteointegration and wear, and para-articular ossification.

During the follow-up period, two patients died and one underwent reimplantation. The remaining 37 patients were satisfied with the surgical outcome. The Harris hip scores higher than 80 points were achieved in 80% of the patients. No loosening or wear of the cup was found at the follow-up.

Good primary fixation in the acetabulum is the results of reliable anchorage by means of 16 spikes on the metal surface of the cup. Good secondary fixation is shown by the results of this study, although to confirm that the incorporation of a surface without a bioactive coat is long lasting will require at least 5 more years of follow-up.

Total hip arthroplasty with the Beznoska cup achieved good outcomes. It was used several times to manage situations in which a press-fit cup initially indicated lacked sufficient primary retention because of the bone being too soft or the acetabulum defective.