I know that people can function and even be high-level athletes without an ACL, but I haven't heard of non-surgical repairs outside of specific inteventions (holding the leg at a fixed angle for a few weeks following an injury). I'd be keen to read about this if you have links?
Ah I think I misread the gp comment - I thought there was research about ACLs repairing 'on their own', this looks like the case I've seen where putting the joint at a fixed angle leads to repair.
