Having a complete ACL tear and not undergoing surgery is like trying to avoid an inevitable situation. Any arthroscopy surgeon is only afraid of one thing that's probably most difficult to treat- a cartilage injury. ACL deficiency leads to instability which you might feel like there is a fear of twisting while you jog, run, try changing directions while walking or jumping from a step. It is quite simple. Once your dynamics of knee change and it becomes unstable, you cartilage damage increases every time it comes out. Strengthening exercises might ward off time but may give you deleterious results. Please consult your arthroscopic surgeon.

All depends on instability symptoms if you have then there is a chance your cartilage can damage. Grade 1 and grade 2 tear can be very well managed conservatively

If you don't have pain or instability of knee.then don't go for surgery. Avoid sports activity.