ACL avulsion is just like a fracture. In your case it is displaced.
100% surgery- arthroscopic screw fixation/ suture repair is advocated.
Next Steps
Share x-rays and MRI.
Consult Orthopaedic surgeon.
Health Tips
Do not worry.
When there is a avulsion, the original ligament length is lost, ligament becomes slack.
You will not have the original tension and strength of ACL here. There might be instability later .
Once fixed in correct position, the ACL will get back its length and tension which is important for knee function .