Dan, when I come off of my SV about 3 years ago I twisted my knee very badly although I didn't realise it at the time. The consequence of which, as I'm getting on a bit (44) is that it unlikely that it wil ever heal properly and it is prone to twisting as the muscle and the tendons were stretched and so are not really strong enough.
This means no more football or skiing, but in day today life it isn't too bad unless I happen to catch my foot and twist it (ouch
). Just a case of getting used to the fact that you have a body that's not perfect.
I know you don't want to hear it, but it just one of those things you have to live with and move on. But I would certainly be trying to sort out some sort of compensation from the recovery company.
It'll get better in time dude
(well it won't, but you'll get used to it, so it will feel like it's better 
)
.