Abstract
Objectives
To evaluate the clinical and radiographic outcomes of total knee arthroplasty using Vega® Knee System (B Braun-Aesculap, Tuttlingen, Germany) [Fig. 1] designed to allow high flexion by shortening the length of posterior condylar flange of femoral component after at least 2 year and to assess the occurrence of periprosthetic osteolysis and loosening at final follow-up.
Materials and Methods
Of the patients who underwent total knee arthroplasty using Vega® Knee System between April 2011 and May 2013, 40 patients (46 knees) were enrolled. The mean age of the patients at the time of surgery was 72.3 years and the mean follow-up period was 29.4 months. Clinical parameters, including Knee Society Knee score, Knee Society Function score, maximal flexion and range of motion were evaluated. Relationship between postoperative maximal flexion and radiographic factors including the posterior tibial slope, the femoral condylar offset and the change of the posterior flange length of femoral condyle was analyzed. Also, the occurrence of periprosthetic osteolysis and loosening was assessed.
Results
The mean preoperative flexion contracture was 4.3° which was reduced to 1.1° at the final follow-up (P < 0.05). The mean preoperative maximal flexion was 121.6° which was increased to 132.7° at the final follow-up (P < 0.05). The mean preoperative range of motion was 122.8° which was increased to 130.5° at the final follow-up (P < 0.05). The mean preoperative knee score and function score were 54.2 and 46.1. At the final follow-up, the mean knee score and function score were improved to 90.2 and 78.6 (P < 0.05). The post operative posterior tibial slope, femoral condylar offset and the change of the posterior flange length of femoral condyle showed no significant relationship with the postoperative maximal flexion angle. (posterior tibial slope; R=0.241, p=0.94 / femoral condylar offset; R=−0.271, p=0.167 / posterior flange; R=−0.074, p=0.623). The periprosthetic osteolysis of the femoral component occurred in two cases, but loosening did not occur at the final follow-up.
Conclusions
Total knee arthroplasy using Vega® Knee System provided satisfactory maximal flexion at minimum 2 year follow-up and there was no the periprosthetic loosening. And, there was no significant relationship between postoperative maximal flexion and radiographic factors including the posterior tibial slope, the femoral condylar offset and the change of the posterior flange length of femoral condyle.
To view tables/figures, please contact authors directly.
