Welcome to the forum, Javier.
I have not heard of this problem before and something tells me it's unlikely that most soldiers who may have this problem would share it with other people who actually know them, as you can probably understand. Also, I am not connected and never have been to any authority in charge of determining health profiles.
But I will say this -- there are a lot of factors which may disqualify someone from service in a combat unit (or in the military altogether) in diaspora countries but not in Israel. I have a friend who couldn't get into the U.S. Coast Guard because he's allergic to shellfish, for example. In Israel, though, it's usually up to the discretion of the doctor based on whether he thinks it could be a problem for you and/or your fellow soldiers. A past injury may automatically lower your profile to something too low to be in a combat unit, but your performance (or just your pleading) may convince an IDF doctor to raise your profile. If you don't have to take medication for this, if it doesn't impair any physical function, and if it's not something that could come back, your chances are better that even if you get a low health profile that you can get it raised later on.
Again, please remember that what I say is not official and that I never made these decisions nor have first-hand knowledge about them. But in my experience, I have seen physical profiles as low as 45 get raised to 82 (just enough for infantry).
Mahal Nahal March '04 draft