Yeah I think an extra sentence was left in there... you would be healed when the whole wound was healed and the whole wound was 7. 4 from the crit and 3 from the attack that crit'd.
So you'd need to make a note by the crit when you wrote down the -10' speed.
This was my interpretation as well, but...
My read on that was that you heal the crit effect next time you are at full HP.
this interpretation also occurred to me. In that case, the example could be 4 extra damage and X regular damage on the critical hit as well as 3 - x damage from 1 or more other hits for a total of 7 damage (and the 7 damage need not even have occurred in the same combat). Another slight variant of this interpretation might be that you have to heal all the damage from the combat in which the critical hit occurred.