My DS, 2021 appointee, had a complete ACL tear near the end of football season in 2015. He had ACL reconstruction using his doubled-over hamstring tendon on Nov 23,2015. He started non-contact football practice a little over 7 months later on July 6,2016. He told his coach he would only run in straight lines without cutting for 1 month. He did his CFA in Aug 2016. He didn't do very well on the mile(7:55), but he had close to an average shuttle run. He was strong in all other categories since he was able to maintain good upper body and core strength. He wanted to finish the CFA before taking the physical dings you get playing football. He also wanted to finish the application in September so he could concentrate on school and football. DS did all the necessary PT and stationary bike riding during rehab. He played the football season with a knee brace and was healthy throughout the season. His baseball season starts with it's opening game this Friday. Of course DODMERB disqualified him due to surgery within one year of application, but he was offered a waiver opportunity within 2 weeks and the waiver was granted 3 weeks later after medical info was sent in to DODMERB. DS had an LOE so it was obvious he was a good candidate.
I agree with DesertCaliMom in letting the doctor know in advance that you will be needing all the medical records to apply to West Point. Most doctors will hear West Point and then do everything they can so that you can achieve your lofty goal. As long as the doctor gives you an all-clear for physical activity without restrictions and states that your knee healed perfectly, then you should get a medical waiver if you are a good candidate in all other ways.
I would take CFA in the early January so that it is marked as complete in your file by the end of January.
ACL recovery is a long road, but many appointed cadets have put in the hard work and diligence to conquer this temporary setback. Good luck. I hope your surgery and recovery go well!