[Reactions of bone tissue around the ABG II stem].

Abstract

Unlabelled: The uncemented total hip replacement became a standard in treatment of the severe hip osteoarthritis. Its long term efficiency is based on the correct osteointegration which depends on the adequate implantation. Material. The study group consisted of 49 patients (52 hips) following total hip replacement with ABG II stem and Trident PSL cup. The follow-up ranged between 6 months and 2 years.

Methods: In each case the Harris hip score was performed and high resolution x-rays were taken. On X-ray the fit and position of the stem, linear osteolysis around the stem and bone atrophy at the greater trochanter were evaluated. Results. The mean HHS at the last follow up was 90.4 (50-99). The mean angle of the stem position was 2.9 varus. The mean fit index was was 0.75. The significant correlation was found between the fit index and the varus stem position angle. The linear osteolysis surrounding the stemin the 1st Gruen zone was found in 70% of cases. The phenomenon of the linear radiolucenecy surrounded by linear densification was found in the 76% of cases. Bone atrophy at the greater trochanter was found in the 42% of cases. Conclusions. The use of ABG II stems provided very good clinical results. The stem has a tendency to a varus position, which seems to be connected with the use of the too small stems. Specific radiographic observations create a need of futher follow-up, but existed without the influence on the clinical results.