When will swelling go down after an ACL surgery?

6 weeks or longer. Duration of swelling after ACL surgery is a function of several items including: 1. Duration and extent of rehabilitation efforts 2. Avoidance of patello-femoral overload during rehabilitation 3. Associated injury especially chondral injury at time of initial injury 4. Presence of associated meniscus injury resolution in 6 weeks is excellent but can last much longer.
2-6 weeks. Typically, the swelling will subside in 2-6 weeks, but may take longer if a patient does not progress with physical therapy.