The decision to have surgery depends on the severity of the ACL injury and how much impact it is having on your quality of life. If you do not have an active lifestyle and your knee feels stable, you may not need surgery. However, delaying surgery could cause more damage to your knee.
Surgery can take place when swelling has reduced and the full range of movement returns to your knee, and when your thigh muscles are as strong as possible. A physiotherapist will help you with this and it can take at least six weeks after an injury for the full range of movement to return.
You will be advised to avoid any sports or activities which involve jumping, turning or twisting. The better your preparation before surgery, the better the results will be.