Even complete arthroplasty doesn’t take 6 months to recover from. For athletes though, it’s the rehabilitation process that takes longer. If it’s just arthroscopic surgery, recovery time can be less than a week.
The people I knew were female Div I athletes when it happened. The surgery wasn’t the hard part. It was the 6 month recovery. And once ACL injured it often happens again. She had no business being on that slope.