Anterior Cruciate Ligament (ACL) Reconstruction

The purpose of this randomized study is to compare donor site morbidity and clinical and functional outcomes of both surgery techniques (bone-patellar tendon-bone (BPTB) graft versus bone-patellar tendon without patellar bone plug (PT) graft) for anterior cruciate ligament reconstruction (ACLR) in athletes. The main questions it aims to answer are: * Does PT graft reduce donor site morbidity compared to the standard BPTB graft? * Does PT technique provide clinical and functional results comparable to the BPTB technique? Researchers will compare the incidence of complications and clinical and functional outcomes between the BPTB and PT grafts groups. Patients will: * Undergo ACLR surgical intervention using one of the two assigned techniques (BPTB or PT) * Follow a two-year assessment program, including visits at three, eight, 12 and 24 months after surgery.

Rehabilitation of knee stability and function after anterior cruciate ligament (ACL) reconstruction is slow and costly. The use of anabolic steroids, such as oxandrolone, may aid in the recovery of muscle mass and strength, as well as functional capacity. Oxandrolone, derived from dihydrotestosterone, has high anabolic activity and low androgenic activity (a 13:1 ratio), making it more effective in promoting weight gain with fewer side effects compared to other steroids. Registered by the FDA and previously by ANVISA (National Health Surveillance Agency (Brazil), it is indicated for cases of post-trauma or post-surgery weight loss. The subdermal use of oxandrolone implants is proposed to release the drug directly into the bloodstream, improving efficacy and reducing issues related to oral administration. This study evaluates the safety and tolerability of the absorbable subdermal oxandrolone implant for 24 weeks versus placebo implant in both men and women as an adjuvant treatment during rehabilitation following anterior cruciate ligament (ACL) surgical reconstruction. The serum and pharmacokinetic profile of the oxandrolone implant will be monitored.

The goal of this clinical trial is to learn if using a phone app for exercises is as effective as working with a physical therapist before anterior cruciate ligament knee surgery. It will also check if exercising before surgery helps patients recover better compared to those who do not follow a specific exercise plan. The main questions it aims to answer are: * Does the phone app help patients improve their knee strength and movement as well as seeing a physical therapist? * Do patients who exercise before surgery have a better recovery after surgery than those who do not? Researchers will compare the phone app group to a physical therapist group and a group with no specific exercise plan to see which method works best. Participants will: * Follow an exercise plan for 4 weeks before their surgery (either using the app, with a therapist, or no specific plan). * Visit the clinic for check-ups before starting the exercises, right before the surgery, and 6 months after the surgery. * Complete simple tests and surveys to measure their knee health.

The goal of this study is to evaluate the performance of Medacta Anatomic Ribbon Surgery (M-ARS) in patients requiring anterior cruciate ligament (ACL) reconstruction. The main goal is to evaluate the survival rate of M-ARS ACL at 6 months post-operatively. The secondary goals are to assess the survival rate, clinical and functional outcomes, the quality of life, and the rate of complications at 1 month, 1 year and 2 years post-operatively.