406 people were enrolled in the outpatient clinic, after screening for inclusion and exclusion. Of the remaining 243 patients who participated in this RCT, 81 were randomly assigned to the DBR group to receive double bundle reconstruction.The hamstring autograft is still used for double-bundle reconstruction. The surgical approach is to treat the native ligaments as anteromedial bundles and posterolateral bundles and restore the structure of the two bundles of ligaments in the process of a

406 people were enrolled in the outpatient clinic, after screening for inclusion and exclusion. Of the remaining 243 patients who participated in this RCT, 81 were randomly assigned to CASBR group.Arthroscopic ASB ACL reconstruction was conducted with transtibial technique and using Hamstring as autograft.Single-bundle reconstruction is used in CASBR reconstruction surgery.

The footprint of the implant on the lateral femoral condyle was chosen to be the location of the AMB bone canal in DB reconstruction surgery while the footprint of the implant on the tibial plateau was chosen to be the location of the bone canal of the PLB in DB reconstruction surgery.

The rehabilitation program for all patients followed a standardized Process. The first day after surgery, quadriceps sets, straight-leg raises, and prone hangs were initiated. All of the patients were allowed to walk with crutches and braces but with no weightbearing. The range of motion (ROM) progressed from 0 to 90 degrees 3 to 7 days postoperatively and reached 115 degrees within fourth week. Closed kinetic chain exercises and full weightbearing were started in the sixth week. Patients progressed to running without braces at 4 to 6 months.

Patients were interviewed by telephone preoperatively, 6 months postoperatively, and 1 year postoperatively to ask about Tegner scores and to encourage reasonable return to sports from 6 months postoperatively.

Inform patients of the possibility of osteoarthritis in patients undergoing ACL reconstruction preoperatively, 6 months postoperatively, and 1 year postoperatively in telephone interviews.Tell the patient that return to sports and quadriceps strength is a must if the knee cartilage damage is to improve.

We used magnetic resonance 3D reconstruction to derive the area perpendicular to the bony canal and subdivide it into the proximal, mid and distal bony canal of the tibia and femur. Since CT is harmful to the human body, we used magnetic resonance imaging instead of CT to collect the last follow-up data of bone tract widening during the return visit.

Weight and height will be combined to report BMI in kg/m^2. Measuring whether bmi is a risk factor for anterior cruciate ligament reconstruction failure

The patients will perform three submaximal trial repetitions for familiarisation, after which three maximum effort trials are recorded. The uninvolved leg will test first at both inclusion sites. Record the single hop for distance.

The patients will perform three submaximal trial repetitions for familiarisation, after which three maximum effort trials are recorded. The uninvolved leg will test first at both inclusion sites. Record the single hop for distance.

The patients will perform three submaximal trial repetitions for familiarisation, after which three maximum effort trials are recorded. The uninvolved leg will test first at both inclusion sites. Record the single hop for distance.

The patients will perform three submaximal trial repetitions for familiarisation, after which three maximum effort trials are recorded. The uninvolved leg will test first at both inclusion sites. Record the triple hop for distance.

The patients will perform three submaximal trial repetitions for familiarisation, after which three maximum effort trials are recorded. The uninvolved leg will test first at both inclusion sites. Record the triple hop for distance.

The patients will perform three submaximal trial repetitions for familiarisation, after which three maximum effort trials are recorded. The uninvolved leg will test first at both inclusion sites. Record the triple hop for distance.

The patients will perform three submaximal trial repetitions for familiarisation, after which three maximum effort trials are recorded. The uninvolved leg will test first at both inclusion sites. Record the cross hop for distance.

The patients will perform three submaximal trial repetitions for familiarisation, after which three maximum effort trials are recorded. The uninvolved leg will test first at both inclusion sites. Record the cross hop for distance.

The patients will perform three submaximal trial repetitions for familiarisation, after which three maximum effort trials are recorded. The uninvolved leg will test first at both inclusion sites. Record the cross hop for distance.

The patients will perform three submaximal trial repetitions for familiarisation, after which three maximum effort trials are recorded. The uninvolved leg will test first at both inclusion sites. Record the 6-meter hop for time.

The patients will perform three submaximal trial repetitions for familiarisation, after which three maximum effort trials are recorded. The uninvolved leg will test first at both inclusion sites. Record the 6-meter hop for time.

The patients will perform three submaximal trial repetitions for familiarisation, after which three maximum effort trials are recorded. The uninvolved leg will test first at both inclusion sites. Record the 6-meter hop for time.

The ADLS is a 14 item scale that queries patients about how their knee symptoms effect their ability to perform general daily activities (6 items) as well as how their knee condition effects their ability to perform specific functional tasks (8 items). Each item is scored 0-5 with 5 indicating "no difficulty" and 0 representing "unable to perform". The highest possible score is 70. The scores of all items are summed, divided by 70, then multiplied by 100 to give an overall ADLS percent rating. Higher percentages reflect higher levels of functional ability. This scale would be appropriate for patients who either do not participate in sports or recreational activities or for those who have not yet progressed to performing these activities

The ADLS is a 14 item scale that queries patients about how their knee symptoms effect their ability to perform general daily activities (6 items) as well as how their knee condition effects their ability to perform specific functional tasks (8 items). Each item is scored 0-5 with 5 indicating "no difficulty" and 0 representing "unable to perform". The highest possible score is 70. The scores of all items are summed, divided by 70, then multiplied by 100 to give an overall ADLS percent rating. Higher percentages reflect higher levels of functional ability. This scale would be appropriate for patients who either do not participate in sports or recreational activities or for those who have not yet progressed to performing these activities

The ADLS is a 14 item scale that queries patients about how their knee symptoms effect their ability to perform general daily activities (6 items) as well as how their knee condition effects their ability to perform specific functional tasks (8 items). Each item is scored 0-5 with 5 indicating "no difficulty" and 0 representing "unable to perform". The highest possible score is 70. The scores of all items are summed, divided by 70, then multiplied by 100 to give an overall ADLS percent rating. Higher percentages reflect higher levels of functional ability. This scale would be appropriate for patients who either do not participate in sports or recreational activities or for those who have not yet progressed to performing these activities

The side to side knee joint laxity of patients after anterior cruciate ligament surgery can be divided into four grades: grade A: -1~2mm(0+), grade B: 3~5mm (1+), grade C: 6~10mm (2+) and D Grade: >10mm(3+) assessed by Lachman test of physical examination.

The side to side knee joint laxity of patients after anterior cruciate ligament surgery can be divided into four grades: grade A: -1~2mm(0+), grade B: 3~5mm (1+), grade C: 6~10mm (2+) and D Grade: >10mm(3+) assessed by Lachman test of physical examination.

Side to side quadriceps strength assessed by Biodex arthrometer test

Side to side quadriceps strength assessed by Biodex arthrometer test

Patients will be asked to fill out the Lysholm score to document the functional status. The minimum is 0 and the maximum value is 100. Higher scores mean a better outcome.

Patients will be asked to fill out the Lysholm score to document the functional status. The minimum is 0 and the maximum value is 100. Higher scores mean a better outcome.

Patients will be asked to fill out the Lysholm score to document the functional status. The minimum is 0 and the maximum value is 100. Higher scores mean a better outcome.

Patients will be asked to fill out the KOOS score to document the functional status. The minimum is 0 and the maximum value is 100. Higher scores mean a better outcome.

Patients will be asked to fill out the KOOS score to document the functional status. The minimum is 0 and the maximum value is 100. Higher scores mean a better outcome.

Patients will be asked to fill out the KOOS score to document the functional status. The minimum is 0 and the maximum value is 100. Higher scores mean a better outcome.

Patients will be asked to fill out the IKDC2000 score to document the functional status. The minimum is 0 and the maximum value is 100. Higher scores mean a better outcome.

Patients will be asked to fill out the IKDC2000 score to document the functional status. The minimum is 0 and the maximum value is 100. Higher scores mean a better outcome.

Patients will be asked to fill out the Tegner score to document the functional status. The minimum is 0 and the maximum value is 10. Higher scores mean a better outcome.

Patients will be asked to fill out the Tegner score to document the functional status. The minimum is 0 and the maximum value is 10. Higher scores mean a better outcome.

Patients will be asked to fill out the Tegner score to document the functional status. The minimum is 0 and the maximum value is 10. Higher scores mean a better outcome.

Patients will be asked to fill out the SF-36 to document the quality of life . General health-related quality of life: SF-36 physical component score (range 0 to 100; higher score = better health state) at 2 yearsTh minimum is 0 and the maximum value is 100. Higher scores mean a better outcome.

Patients will be asked to fill out the SF-36 to document the quality of life.General health-related quality of life: SF-36 physical component score (range 0 to 100; higher score = better health state) at 5 years. The minimum is 0 and the maximum value is 100. Higher scores mean a better outcome.

Patients will be asked to fill out the SF-36 to document the quality of life.General health-related quality of life: SF-36 physical component score (range 0 to 100; higher score = better health state) at 10 years. The minimum is 0 and the maximum value is 100. Higher scores mean a better outcome.

The difference in signal density between reconstructed ACL and PCL was used to measure graft ligamentation on MRI. Higher signal values represent higher inflammation and lower signal values represent better ligamentation.

The difference in signal density between reconstructed ACL and PCL was used to measure graft ligamentation on MRI. Higher signal values represent higher inflammation and lower signal values represent better ligamentation.

The knee laxity test of the forward KT-2000 measured knee laxity at pressures of 132Nt, 88Nt, 66Nt, and 44Nt, respectively, while the back-pushing KT-2000 was measured at -132NT, 88Nt, 66Nt, and -44Nt. The foward-pushing KT-2000 asessed side-to-side can be stratified into five levels are (A) < - 1 mm, (B) - 1 to 1 mm, (C) 1-3 mm, (D) 3-5 mm and (E) > 5 mm.

The back-pushing KT-2000 is also divided into side to side differences as (A) < - 2 mm, (B) - 2 to - 0.5 mm, (C) - 0.5 to 0.5 mm, (D) 0.5-1 mm and ( E) > 1 mm.

The knee laxity test of the forward KT-2000 measured knee laxity at pressures of 132Nt, 88Nt, 66Nt, and 44Nt, respectively, while the back-pushing KT-2000 was measured at -132NT, 88Nt, 66Nt, and -44Nt. The foward-pushing KT-2000 asessed side-to-side can be stratified into five levels are (A) < - 1 mm, (B) - 1 to 1 mm, (C) 1-3 mm, (D) 3-5 mm and (E) > 5 mm.

The back-pushing KT-2000 is also divided into side to side differences as (A) < - 2 mm, (B) - 2 to - 0.5 mm, (C) - 0.5 to 0.5 mm, (D) 0.5-1 mm and ( E) > 1 mm.

Computed tomography was used to acquire a baseline of the bone tunnel one days after ACL reconstruction for comparison in studies of bone tunnel widening at follow-up visits.