The only way you could avoid injury is to immediately tap out once a leg lock is secured on you and make sure you aren't training with someone that would intentionally hurt you. Personally I don't care for leg locks. I don't think there that useful in a real fight.
A while back we had a guy in our bjj class that had fought in some kind of small time MMA event and got his teeth kicked in while trying to do a leg lock.
Judo still has leg locks in it. Leg locks just aren't allowed in competition. Or atleast thats how my local judo club is. I think they practice leg locks during the off season (when there aren't so many tournaments). The higher ranking guys told me they would do leg locks while rolling with me if I wanted to do them.
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MrPoopy
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