ACL injury is one of the most serious sports injuries, which occurs in the so-called torsion sports. Torsional sports are sports that require a high degree of knee stability, such as sharp turns, stops, accelerations and decelerations. Soccer, handball, ice hockey and field hockey are some of the sports that have a high rate of ACL injuries in athletes. Most orthopaedic surgeons recommend reconstruction to restore joint stability after ACL injury, but long-term follow-up evidence is lacking. There is also a lack of uniformity in the methods used to evaluate the function of the joint after surgery. The purpose of this study is twofold. One is to observe the long-term subjective functional status of patients and their life treatment after ACL reconstruction; the other is to observe whether there is a correlation between the results of various clinical examinations and commonly used ancillary tests at the 2-year postoperative follow-up and their subjective functional scores and quality of life at 11.5 years after surgery. The authors selected 56 patients who had ruptured the anterior cruciate ligament in one knee and underwent autologous bone-patellar tendon-bone reconstruction. Follow-up was performed 2 years after their surgery to record the single-leg hopping distance, to perform isometric muscle testing of their affected limb moments, their anterior-posterior knee laxity, and to record Lysholm and Tegner scores. The KOOS subjective knee function score and the SF-36 subjective quality of life score were performed 11.5 years after surgery, and the Lysholm and Tegner scores were recorded again. The authors found no significant difference between the SF-36 scores of the patients in each group and their healthy Swedish counterparts of the same age and sex at 11.5 years postoperatively. There was no correlation between the patients’ single-leg hopping distance, affected limb moment, and straightforward laxity of the affected knee and their subjective functional status at 11.5 years postoperatively. In particular, there was no difference in the subjective knee function scores at 11.5 years of follow-up between patients with 3 mm greater direct laxity in the affected knee than in the healthy side at the 2-year follow-up and those with better stability in the affected side. The KOOS and SF-36 values did not correlate with age or sex. It was concluded that patients who underwent ACL reconstruction using bone-patellar tendon-bone had a more satisfactory normal long-term knee function and quality of life. And there was no correlation between their subjective functional status of knee motion and with quality of life scores, and the results of various objective assessments at their 2-year postoperative follow-up.