Summary

Tibial tunnel angle in the range of less than 67.5o and more than 75o can predict the occurrence of knee instability in 6 months after Anterior Cruciate Ligament reconstruction, Femoral tunnel angle in the range of less than 37.5o and more than 40o can predict the occurrence of knee instability in 6 months after Anterior Cruciate Ligament reconstruction

Abstract

Introduction

Anterior cruciate ligament (ACL) ruptures are the most common sports injuries in young adult. In ACL reconstruction, there are 2 axes in the form of femoral and tibial tunnels for ACL biomechanics. The position of the tibia bone tunnel and femoral bone tunnel plays a very important role in determining knee joint stability and affects the functional outcome in active population. The authors interested in further research the femoral and tibial tunnel angle as predictors of knee instability after ACL reconstruction.
Objectives: the research objective described in this study is to investigate the femoral and tibial tunnel angle as intraoperative guidelines to predict the occurence of knee instability after ACL reconstruction in Balinese population

Methods

in cross-sectional study group, 34 consecutive patients who had isolated ACL injury and underwent ACL reconstruction were followed up for 6 months. The measurement of the femoral tunnel angle and tibial tunnel angle of the knee were done by CT-Scan, and we evaluated the Lachman test (Lachmeter) and ROC curve analysis to determined the intersection between the femoral and tibial tunnel angles. Data were analyzed using the Statistical Package for Social Science (SPSS) version 25.0 program.

Results

34 of these patients, 11 patients (32.4%) were affected on the right knee while 23 patients (67.6%) were affected on the left knee. There were 11 patients with unstable knee and 23 patients classified as stable knee. There was a significant correlation between TA Femur and knee instability with P value of 0.020 (P value < 0.05). There was a significant correlation between tibial tunnel angle to instability with P value of 0.007 (P value <0.05).

Conclusion

Tibial tunnel angle in the range of less than 67.5o and more than 75o can predict the occurrence of knee instability in 6 months after Anterior Cruciate Ligament reconstruction, Femoral tunnel angle in the range of less than 37.5o and more than 40o can predict the occurrence of knee instability in 6 months after Anterior Cruciate Ligament reconstruction
Keywords: Femoral Tunnel Angle, Tibial Tunnel, Anterior Cruciate Ligament Reconstruction, cross-sectional