What is the ACL status??
Two options for rehabilitation:
1. If ACL avulsion is planned for fixation in 2nd surgery, then you may bend the knee to gain pre-operative knee range of motion.
2.If ACL avulsion is repaired, then better to delay knee bending for 3 weeks post surgery.
Next Steps
Quadriceps exercises(static) and ice pack application will help.
Health Tips
Dont bear weight over operated lower limb without consent of your treating surgeon.