Hello and welcome
Usually If the symptoms of the ACL tears does not disappear after all conservative therapy like exercises, Physiotherapy
and medication than we need a surgery to repair the tear. The decision is to be taken by both clinical examination and MRI
report. I think your doctor is going in right direction.
Go for the surgery and follow the advises as directed by your doctor.
If you need a opinion on MRI report please upload the report using premium service of the site.
Best Wishes and get well soon