There's a good reason that the extremely effective throw Kani Basami has been banned in all Judo and most BJJ competitions: it's super dangerous! Kani Basami has inflicted severe lower body injuries in dojos and competitions all over the world.

Can you hurt someone with judo?

Judo throws do not necessarily hurt one's back. ... However, throws are likely to hurt one's back if one lands in the wrong way or throws someone improperly. If Judo throws always hurt one's back, most Judokas will quit a few days or weeks into the training.

Are judo throws legal in BJJ?

In sport BJJ most of the standard judo and wrestling throws are legal despite how closely they might resemble a slam. While most organization don't explicitly define a slam versus a takedown, US Grappling has a rule stating, "Takedowns are NOT considered slams, but you must deliver your opponent safely to the mat".