Reconstruction of double-bundle anterior cruciate ligament with sling femoral fixation technique:A prospective study

Objective To assess the therapeutic effect of sling femoral fixation technique on reconstruction of double-bundle anterior cruciate ligament（ACL）. Methods A prospective study was involved in this study.The inclusion criteria were a simple chronic ACL rupture without injury of other knee ligaments,and the time between injury and operation being at least 2 months.The study was carried out from May 2005 to June 2008.Sixty-two patients included in this study were randomly divided into 2 groups,31 in each group,with no statistical difference in related influencing factors between the 2 groups.Patients in group I were treated with sling femoral fixation was carried out.Patients in group Ⅱ were treated with interference screw fixation of the femoral end.Patients in both groups were treated with biodegradable interference screw fixation of the tibia.All operations were performed by the same surgeon group.Each patient was scored using the Lysholm scoring system,Cincinnati knee rating system,International Knee Documentation Committee（IKDC） rating system,The anterior tibia displacement length measured with KT-2000 at 134N,and the knee motion was examined,respectively,before and 2 years after operation. Results The Lysholm score was（91±7） and（89±9） for groups I and II,respectively（P=0.088）.The Cincinnati knee score was（93±6） and（90±8） for groups I and II,respectively（P=0.189）.The objective IKDC rate was 71% and 26% for group I,and 58% and 35% for group II,respectively（P=0.221）.The average anterior tibia displacement length was（1.3±1.2）mm for group I,and（1.4±1.3）mm for group II（P=0.196）.The knee motion was（136±10） degree for group I and（130±15） degree for group II（P=0.029）. Conclusion The function score and stability test for the knee joint are not significantly different after reconstruction of double-bundle ACL with sling femoral fixation and screw fixation.The knee motion is better after sling femoral fixation than after screw fixation.