I went in for an arthroscopy some years ago for what was going to be a bit of a look and maybe a minor stitch or two of something and woke up with a full ACL reconstruction. Apparently my surgeon phoned Mr FM while I was under and told him the ligament was broken and should they repair it. Mr FM wondered if anyone says no.
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it healed quite well, but after a few months I took a phone call in the family room, needed something from my desk and ran up the stairs forgetting I couldn’t really do that, caught my foot on the top step and summersaulted into the entrance hall, coming down on my knee. That healed OK, but had a fair bit of pain in the knee that wasn’t going away.
Then had a fight with an obnoxious teenage Dr FM, she ran Into her room and slammed the door and I lent on the door, saying “ I haven’t finished talking to you” and tried to make it open. Knee went on me again (which resolved the fight as Dr FM was in tears at me getting hurt!). However when it all healed up again, no pain at all. Surgeon thinks there was scar tissue there causing stiffness and pain and I had sort of torn the scar tissue away, with long term benefits!