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• W2531455915 abstract "Introduction Malrotation of the femoral component is a cause of patellofemoral maltracking after total knee arthroplasty. We have developed a balanced gap technique in posterior stabilized total knee arthroplasty using an original instrument. Patellar instability is associated with an increased the tibial tubercle and the center of the groove (TT-TG) distance > 20 mm, and TT-TG is regarded as one index of a factor influencing congruity. To assess the influence on a patellofemoral joint by a modified gap technique, the purpose of this study is to compare the TT-TG distance before surgery and after total knee arthroplasty. Material and Methods We explored the 30 knees, 25 patients (4 male and 21 female), who underwent total knee arthroplasties (NexGen LPS-Flex, fixed surface, Zimmer; Warsaw, USA) for osteoarthritis or rheumatoid arthritis. All procedures were performed through a medial parapatellar approach and a balanced gap technique used a developed versatile tensor device. We compared the preoperative and postoperative CT at a knee flexion angle of 30 degrees. To assess the force vector of the extensor mechanism, TT-TG distance and the proximal-distal distance between the entrance of the tracheal groove and the tibial tubercle (ET-TT distance) were measured in CT. The relation of both distances (TT-TG index) that divided TT-TG in ET-TT was calculated, because the TT-TG distance was affected by the individual knee size. Three dimensional Q-angle (θ) was also calculated using TT-TG distance and ET-TT distance, sinθ = TT-TG distance/ET-TT distance. (Figure 1) Results The mean TT-TG distance of the pre-operation and post-operation was 14.6 ± 4.9 mm and 12.4 ± 3.9 mm, respectively. The mean ET-TT distance of the pre-operation and post-operation was 68.5 ± 7.3 mm and 71.8 ± 7.5 mm, respectively. The mean TT-TG index of the pre-operation and post-operation was 0.22 ± 0.07 and 0.17 ± 0.05, respectively. The mean θ was 12.1 ± 3.96 degrees and 9.84 ± 2.98 degrees, respectively. There were statistically differences of between pre-operation and post-operation. Discussion TT-TG distance, TT-TG index and the three dimensional Q angle decreased after total knee arthroplasty using the modified gap technique. These results indicated that patellofemoral joint was realigned and stabilized, and the force vector of the extensor mechanism was decreased by the modified gap technique." @default.
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• W2531455915 date "2013-12-01" @default.
• W2531455915 modified "2023-09-23" @default.
• W2531455915 title "The Force Vector of the Extensor Mechanism Was Decreased by the Balanced Gap Technique in Total Knee Arthroplasty" @default.
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