Comparison of Single-bundle Versus Double-bundle Anterior Cruciate Ligament Reconstruction

The goal of this retrospective randomized study is to compare two surgical techniques (single vs. double bundle) of ACL (anterior cruciate ligament) reconstructions in participants with rupture of anterior cruciate ligament without major other injuries of the injured knee (exclusion criteria defined). The main question it aims to answer are: * which surgery gives better outcome in patients (short- and long-term results)? * are there any sings of osteoarthritis in an injured knee compared to a healthy knee? Participants will be invited to our clinic after 15 years to do clinical and functional exams with x-Ray and magnetic resonance imaging (MRI) of both knees. Subjective exams with different scores (Tegner score, Lysholm score..) were also done. The same exam protocol for participant was used again after two years and fifteen years since surgery.