Hello Sir, If an individual has torn his/her ACL ligament, it is happened almost five years ago, has 23 years age, so what would you suggest that he should do surgery or not having surgery? what you think if the time is passing on it, not having surgery, what would be the side effects in old age? some other information regarding it cause the doctors know better than us even we can make a question what they think to tell us. thanks a lot With Regards, OMAID