Abstract
Introduction
The aim of our study was to compare the radiographic alignment unicompartmental knee arthroplasty (UKA) with using conventional non-navigation technique and computer-assisted navigation technique. Our study was focused on bearing alignment on clinical outcome of knee.
Materials and Methods
In our department we have performed between January 2005 and December 2012 106 UKA. All patients were examined clinically and radiologically before and after operation. There were implanted two types of UKA, 67 of UKA were performed by The PRESERVATION™ (DePuy) with navigation and 39 UKA Oxford® Partial Knee (Biomet.) were performed by conventional technique. In our study we have evaluated 104 of medial UKA divided to groups, 65 implantation of The PRESERVATION™ and 39 implantation of Oxford® Partial Knee UKA. We have evaluated 101 patients, 61 women, 40 men, average age 66,5 (50–82) years. Firstly we performed measurement of parameters determine alignment UKA. These values were written down and the deviation of norm was established. Results were divided in two groups, one with values of normal range and the second beyond normal range. Values of all UKA were matched with clinical outcome postoperatively. This assessment was performed by The Knee Society Clinical Rating System (Knee score).
Results
The mean follow-up was 3,3 (max. 7,1) years. The group with navigation technique improved Knee score from mean 58 (41–79) preoperatively to 93 (62–100) postoperatively. Conventional UKA Knee score improved from 56 (39–77) preoperatively to 91 (61–100) postoperatively. Clinical outcome is comparable in both groups. Radiological assessment of alignment unicompartmental knee replacement according to our measurement results in favour of computer-assisted navigation.
Conclusion
Computer-assisted navigation enables more exact alignment of the femoral and tibial component than conventional technique. In spite of the fact that difference clinical outcome is comparable.
